Section 11. Electrical System. 42--CF200--MA--09 (formerly 42-65) Issued 5/96 P/N B. E 1996 Nordson Corporation All rights reserved

Transcription

1 ection 11 Electrical ystem

2 11-0 Electrical ystem

3 Table of Contents i Table of Contents ection 11 Electrical ystem 1. Introduction Electrical Operation Heating Zones Electrical pecifications Cordset Installation Installing Meltex C-tyle Cordsets Disconnecting Cordsets Checking Thermocouple Operation Removing and Replacing a Thermocouple Thermostat Operation Resetting a Thermostat Checking Thermostat Operation Removing and Replacing a Thermostat Checking olenoid Valve Operation Thermocouple Voltage Charts Electrical ervice Kits and pare Parts

4 ii Table of Contents

5 Electrical ystem 11-1 ection 11 Electrical ystem WARNING: Allow only qualified personnel to perform the following tasks. Observe and follow the safety instructions in this document and all other related documentation. 1. Introduction This section describes the eries CF-200 Applicator electrical system for applicators with Meltex 7-wire, thermocouple style (herein after referred to as Meltex 7-wire, C-style) adhesive manifold cordsets and Meltex 5-wire, C-style air manifold cordsets. The electrical system includes the following components: cordsets thermocouples thermostats heater cartridges extension cords solenoid valves In addition to the electrical components that are part of the eries CF-200 Applicator, the adhesive hose contains connectors and associated wiring that connect electrically to the applicator. (The adhesive hose electrical connectors and wiring and the extension cord supply electrical power to the adhesive manifold and to the heated air manifold and to carry the electrical signals from the thermocouples to the controller.)

6 11-2 Electrical ystem Electrical Operation On Nordson eries CF-200 Applicators, electrical power is supplied to one or more heaters in the adhesive manifold to maintain the adhesive at its application temperature. Electrical power is also supplied to one or more heaters in the heated air manifold to heat its incoming air supply to the application temperature of the adhesive. Electrical wiring and connections are present in both manifolds to connect the thermocouple for each heating zone to a controller. (A thermocouple provides an electrical signal proportional to the temperature in its heating zone.) In each heating zone, a thermostat wired in series with the heater(s) provides additional overtemperature protection. Meltex 7-wire, C-style cordsets also include two wires that provide electrical power to a solenoid valve attached to the CF-200 applicator. The solenoid valve controls the supply of module actuating air to the applicator. Heating Zones A manifold on a eries CF-200 Applicator is divided into one or more heating zones. A heating zone in the adhesive manifold is known as an adhesive heating zone. A heating zone in the heated air manifold is known as an air heating zone. The number of heating zones in a manifold depends on the size of the manifold and the available control channels. The size of an applicator is related to its output requirements and whether or not the applicator is filtered or non-filtered. The heating requirements of a filtered applicator are greater than those of a non-filtered applicator. Also, the heating requirements of the heated air manifold are greater than the heating requirements of the adhesive manifold. Each heating zone includes one thermocouple, one thermostat, and one or two heater cartridges. These devices are electrically connected to a control channel on the melter controller or on a stand-alone temperature controller. The controller receives the thermocouple electrical signal, and the controller regulates the electrical power supplied to the zone heater(s) based on the thermocouple signal. 2. Electrical pecifications Refer to the applicator nameplate stamping information on the applicator reference drawing in ection 8 for the voltage and wattage information for the eries CF-200 Applicator documented by this publication.

7 Electrical ystem Cordset Installation A Meltex 7-wire, C-style cordset for an adhesive heating zone has a square 8-pin male plug that connects to an 8-pin female receptacle on an adhesive hose. A Meltex 7-wire, C-style cordset for an air heating zone has a round 7-pin male plug that connects to a 7-pin female connector on an extension cord Fig Meltex 7-Wire, C-tyle Adhesive Manifold Cordset Connector Fig Meltex 7-Wire, C-tyle Air Manifold Cordset Connector Table 11-1 lists the extension cords for use with Meltex 7-wire, C-style cordsets that are available from Nordson. Table 11-1 Extension Cords for Meltex 7-Wire, C-tyle Cordsets Part Description Length For 7-pin, Meltex C-style air manifold cordset 6.1 m (18 ft) For 7-pin, Meltex C-style air manifold cordset 7.3 m (24 ft) For 7-pin, Meltex C-style air manifold cordset 10.1 m (33 ft)

8 11-4 Electrical ystem 3. Cordset Installation (contd.) Normally, the electrical configuration, including the number of adhesive hose electrical connectors, extension cords, and applicator cordsets, is determined by a Nordson representative working with the customer. NOTE: The cordset installation procedure in this section describes an installation in which the adhesive heating zone cordsets are connected to the power supplies through adhesive hose receptacles and air heating zone cordsets are connected to the power supplies through air manifold extension cords, which is the recommended configuration. Installing Meltex C-tyle Cordsets To connect Meltex 7-wire, C-style cordsets on a eries CF-200 Applicator, use the following procedure: 1. If the system is in operation, relieve the hydraulic pressure in the hot melt system (refer to Relieving Hydraulic Pressure in ection 7). 2. Disconnect and lock out the electrical power to the hot melt system. 3. Connect the plug at the melter end of the adhesive hose to a receptacle at the melter. 4. At the applicator, plug an adhesive manifold cordset (square connector) into the receptacle at the applicator end of the adhesive hose Fig Typical Adhesive Heating Zone Cordset Connections 1. Adhesive manifold 4. Adhesive hose 2. Adhesive heating zone cordset 5. Hose cord and plug and plug 6. Control channel receptacle 3. Adhesive hose receptacle Locate all air manifold extension cords. (Air manifold extension cords have round connectors at both ends.) 6. Connect each air manifold extension cord plug to a receptacle on the melter.

9 Electrical ystem 11-5 Installing Meltex C-tyle Cordsets (contd.) 7. Connect each air manifold cordset (round connector) to an air manifold extension cord receptacle Fig Typical Air Heating Zone Cordset Connection 1. Adhesive manifold 4. Extension cord 2. Air heating zone cordset and plug 5. Extension cord plug 3. Extension cord receptacle 6. Control channel receptacle elect one of the following steps as appropriate: If the cordsets were connected as part of the initial installation of the eries CF-200 Applicator, return to the applicator installation procedures in ection 3 of this publication and complete the installation. If the cordsets were connected as part of another procedure, return to that procedure. If the hot melt system is to be returned to normal operation, apply electrical power, then return the system to normal operation (refer to tarting the Applicator in ection 4). Disconnecting Cordsets To disconnect the cordsets on a eries CF-200 Applicator, use the following procedure: 1. If the system is in operation, relieve the hydraulic pressure in the hot melt system (refer to Relieving Hydraulic Pressure in ection 7). 2. Disconnect and lock out electrical power to the hot melt system. 3. For each cordset on the applicator, disconnect the cordset plug from the adhesive hose or extension cord receptacle to which it is connected.

10 11-6 Electrical ystem 4. Checking Thermocouple Operation The voltage, in millivolts, across a thermocouple used in a eries CF-200 Applicator varies with the temperature of the applicator. In each heating zone, the controller monitors the thermocouple voltage and controls the electrical power to the heater(s) based on that voltage Fig Thermocouple 1. et screw 2. Thermocable 3. Thermocouple Use the following procedure to check the thermocouple operation: 1. With the applicator at normal operating temperature, relieve hydraulic pressure (refer to Relieving Hydraulic Pressure in ection 7). 2. Disconnect and lock out the system power. 3. Use a millivoltmeter to check the thermocouple voltage between pins 6 and 7 on the cordset connector at a particular temperature. Refer to Table 11-2 to determine whether or not the measured value is the normal value for that temperature. 4. Perform one of the following steps based on the results of the voltage test: If the measured voltage is correct for the temperature, the thermocouple is operating correctly. Return to the procedure that referenced this test. If the measured voltage is not correct for the temperature at which it was measured, replace the thermocouple (refer to Removing and Replacing a Thermocouple in this ection).

11 Electrical ystem Removing and Replacing a Thermocouple Use the following procedure to remove and replace a thermocouple on a eries CF-200 Applicator: 1. Relieve the hydraulic pressure (refer to Relieving Hydraulic Pressure in ection 7). 2. Disconnect and lock out power to the hot melt system. 3. Unplug the cordset for the thermocouple that is being replaced. 4. Remove the screws that secure the cover to the manifold Fig Adhesive Manifold ervice Cover (Typical) 1. Location of cover screws 5. Note the color of the wire connected to pin 6 and the color of the wire connected to pin 7. Then disconnect the thermocable from pins 6 and 7 on the cordset connector, and remove the thermocable from the cordset flexible conduit. The thermocable is made of two wires twisted together and connected to pins 6 and 7 at one end and to the thermocouple sensor at the other end. 6. Remove the thermocouple sensor from its mounting hole in the applicator. 7. Locate the new thermocable, and thread one end of it through the flexible conduit. Then connect the wires to pins 6 and 7, matching wirestopinsbywirecolor. 8. At the other end of the thermocable, strip about 2.54 cm (1 in.) of insulation off both wires.

12 11-8 Electrical ystem 5. Removing and Replacing a Thermocouple (contd.) 9. Twist the two sections of bare wire together so that secure contact is made between the wires. 10. Clip the section of bare wire twisted together so that it is about cm ( 1 / 4 in.) to 1.27 cm ( 1 / 2 in.) long. 11. Insert the thermocable into the thermocouple sensor, and tighten the set screw on the sensor to secure the thermocable. 12. Insert the thermocouple sensor into the hole in the applicator from which the failed sensor was removed. 13. Replace the manifold cover and secure it with the cover screws. 14. Connect the applicator cordset plug to the adhesive hose or extension cord receptacle from which it was disconnected. 15. Restore the system to normal operation (refer to the melter technical manual).

13 Electrical ystem Thermostat Operation In each adhesive heating zone on Nordson eries CF-200 Applicators with Meltex 7-wire, C-style cordsets, a thermostat is connected in series with the heater(s). The thermostat provides additional overtemperature protection Fig Adhesive Manifold Thermostat 1. Reset button NOTE: When an adhesive manifold thermostat opens because of high temperature, it must be manually reset before the applicator can be returned to normal operation. (Refer to Resetting a Thermostat in this section.) NOTE: The setpoint temperature for the thermostat used with Meltex C-style cordsets is 260 _C (500 _F).

14 11-10 Electrical ystem 6. Thermostat Operation (contd.) Normally, the controller maintains the temperature in a heating zone based on the voltage of the thermocouple. However, if the thermocouple fails, the thermostat acts as a backup, preventing the temperature in that heating zone from rising above the setpoint. During normal operation, when the applicator temperature is below the setpoint, the thermostat should be closed, allowing power to reach the heaters. If the applicator does not heat properly and the applicator temperature has not been above the setpoint temperature, a thermostat may have failed. If the applicator temperature rises above the thermostat setpoint, the thermostat has failed. The hot melt system should be shut down and the thermostats checked and replaced as necessary. 7. Resetting a Thermostat Perform the following procedure to reset a thermostat on a eries CF-200 Applicator with Meltex 7-wire, C-style cordsets: 1. With the applicator at the normal operating temperature, relieve the hydraulic pressure (refer to Relieving Hydraulic Pressure in ection 7). 2. Disconnect and lock out the system power. 3. Remove the manifold cover (see Figure 11-6), and locate the wiring for the thermostat and the heater(s). (ee the wiring diagram on the applicator reference drawing in ection 8 for the exact location of the manifold service cover screws). 4. Locate the thermostat to be reset, and press the reset button located on the thermostat. 5. Replace the manifold cover. 6. Return the hot melt system to normal operation. 8. Checking Thermostat Operation Perform the following procedure to determine whether or not a thermostat has failed in the open position: 1. With the applicator at the normal operating temperature, relieve the hydraulic pressure (refer to Relieving Hydraulic Pressure in ection 7). 2. Disconnect and lock out the system power. 3. With the applicator at or below the normal operating temperature, locate the cordset to which the thermostat is connected. Unplug the cordset from the adhesive hose or the extension cord receptacle. NOTE: When the temperature is at or below the recommended application temperature of the adhesive, the thermostat should be closed.

15 Electrical ystem Checking Thermostat Operation (contd.) 4. Use an ohmmeter to check the resistance between pins 2 and 3 on the cordset connector. Perform one of the following tests based on the results of the resistance test. If the measured resistance does not indicate an open circuit, the thermostat is operating correctly at the normal operating temperature. Return to the procedure that referenced this test. If the measured resistance indicates an open circuit, the thermostat may have failed. Proceed to the next step in this troubleshooting procedure. 5. Remove the manifold cover (see Figure 11-6) and locate the wiring for the thermostat and the heater. Inspect the wiring and wire nuts for looseness or damage. (ee the wiring diagram on the applicator reference drawing in ection 8 for the exact location of the manifold service cover screws). If loose or damaged connections or damaged wiring is found, tighten the connections or repair the damaged wiring. 6. Use an ohmmeter to test the electrical continuity of the thermostat by placing the ohmmeter probes on thermostat wiring connectors. Perform one of the following steps based on the result of the continuity test. If the measured resistance indicates a short circuit, the thermostat is operating correctly. Replace the manifold cover, connect the cordset to the receptacle from which it was unplugged, and return to the procedure that referenced this test. If the measured resistance indicates an open circuit, the thermostat is open. Go to tep Attempt to reset the thermostat by pressing the reset button located on the thermostat. 8. Perform the electrical continuity test described in tep 6, and perform one of the following steps based on the results of the continuity test. If the measured resistance indicates a short circuit, the thermostat is operating correctly. Replace the manifold cover, connect the cordset to the receptacle from which it was unplugged, and return to the procedure that referenced this test. If the measured resistance indicates an open circuit, the thermostat is open. Replace the thermostat (refer to Removing and Replacing a Thermostat in this section).

16 11-12 Electrical ystem 9. Removing and Replacing a Thermostat Use the following procedure to remove and replace a thermostat: 1. With the applicator at the normal operating temperature, relieve the hydraulic pressure (refer to Relieving Hydraulic Pressure in ection 7). 2. Disconnect and lock out the system power. 3. Remove the manifold cover (see Figure 11-6), and locate the thermostat and heater wiring. (ee the wiring diagram on the applicator reference drawing in ection 8 for the exact location of the manifold service cover screws). 4. Loosen the wire nuts connecting the wiring to the thermostat, remove the thermostat screws, and remove the thermostat from the manifold. 5. Place the new thermostat in the mount, secure it with the thermostat screws, and connect the thermostat wiring to the cordset and heater wiring with the wire nuts. (ee the wiring diagram on the applicator reference drawing in ection 8.) 6. Replace the manifold cover. 7. Plug the cordset into the adhesive hose or extension cordset receptacle. 8. Return the hot melt system to normal operation. 10. Checking olenoid Valve Operation Use the following procedure to check the operation of the solenoid valve: 1. Relieve the hydraulic pressure (refer to Relieving Hydraulic Pressure in ection 7). 2. Disconnect and lock out power to the hot melt system. 3. Unplug the adhesive cordset that supplies electrical power to the solenoid valve. 4. Use an ohmmeter to check the resistance between pins 4 and 5 on the cordset. 5. A short circuit or low resistance indicates that the solenoid is operating correctly. Return to the procedure that referenced the solenoid valve check. An open circuit indicates loose wiring, a poor connection, or a damaged solenoid. Proceed to tep 6.

17 Electrical ystem Checking olenoid Valve Operation (contd.) 6. Remove the manifold service cover and check the cordset wiring to the solenoid for damaged wiring or loose connections. (ee the wiring diagram on the applicator reference drawing in ection 8 to locate the manifold service cover and the service cover screws.) Perform one of the following steps: If damaged wiring or a loose connection is found, proceed to tep7. If cordset wiring damage or a loose connection is not found, refer to the solenoid documentation for troubleshooting information. 7. Repair damaged wiring or loose connections and test the electrical continuity at cordset pins 4 and 5. Perform one of the following steps: If the solenoid operation is normal, replace the service cover, connect the cordset, and return the system to normal operation. Refer to the solenoid valve documentation for troubleshooting information. 11. Thermocouple Voltage Charts The table that follows lists voltage as a function of temperature for the thermocouple used with the Meltex C-style cordset. Table 11-2 Thermocouple Voltage as a Function of Temperature Temperature Voltage Temperature Voltage 18 _C 64.4 _F 0.94 mv 46 _C _F 2.43 mv 19 _C 66.2 _F 1.00 mv 47 _C _F 2.49 mv 20 _C 68.0 _F 1.05 mv 48 _C _F 2.54 mv 21 _C 69.8 _F 1.10 mv 49 _C _F 2.60 mv 22 _C 71.6 _F 1.16 mv 50 _C 122 _F 2.65 mv 23 _C 73.4 _F 1.21 mv 51 _C _F 2.70 mv 24 _C 75.2 _F 1.26 mv 52 _C _F 2.76 mv 25 _C 77.0 _F 1.31 mv 53 _C _F 2.81 mv 26 _C 78.8 _F 1.37 mv 54 _C _F 2.87 mv 27 _C 80.6 _F 1.42 mv 55 _C 131 _F 2.92 mv 28 _C 82.4 _F 1.47 mv 56 _C _F 2.97 mv 29 _C 84.2 _F 1.53 mv 57 _C _F 3.03 mv 30 _C 86.0 _F 1.58 mv 58 _C _F 3.08 mv 31 _C 87.8 _F 1.63 mv 59 _C _F 3.14 mv 32 _C 89.6 _F 1.69 mv 60 _C 140 _F 3.19 mv Continued on next page

18 11-14 Electrical ystem 11. Thermocouple Voltage Charts (contd.) Table 11-2 Thermocouple Voltage as a Function of Temperature (contd.) Temperature Voltage Temperature Voltage 33 _C 91.4 _F 1.74 mv 61 _C _F 3.24 mv 34 _C 93.2 _F 1.79 mv 62 _C _F 3.30 mv 35 _C 95.0 _F 1.84 mv 63 _C _F 3.35 mv 36 _C 96.8 _F 1.90 mv 64 _C _F 3.41 mv 37 _C 98.6 _F 1.95 mv 65 _C 149 _F 3.46 mv 38 _C _F 2.00 mv 66 _C _F 3.51 mv 39 _C _F 2.06 mv 67 _C _F 3.57 mv 40 _C _F 2.11 mv 68 _C _F 3.62 mv 41 _C _F 2.16 mv 69 _C _F 3.68 mv 42 _C _F 2.22 mv 70 _C 158 _F 3.73 mv 43 _C _F 2.27 mv 71 _C _F 3.78 mv 44 _C _F 2.33 mv 72 _C _F 3.84 mv 45 _C _F 2.38 mv 73 _C _F 3.89 mv 74 _C _F 3.95 mv 102 _C _F 5.48 mv 75 _C _F 4.00 mv 103 _C _F 5.53 mv 76 _C _F 4.05 mv 104 _C _F 5.59 mv 77 _C _F 4.11 mv 105 _C _F 5.64 mv 78 _C _F 4.16 mv 106 _C _F 5.70 mv 79 _C _F 4.22 mv 107 _C _F 5.75 mv 80 _C _F 4.27 mv 108 _C _F 5.81 mv 81 _C _F 4.32 mv 109 _C _F 5.87 mv 82 _C _F 4.38 mv 110 _C _F 5.92 mv 83 _C _F 4.43 mv 111 _C _F 5.97 mv 84 _C _F 4.49 mv 112 _C _F 6.03 mv 85 _C _F 4.54 mv 113 _C _F 6.08 mv 86 _C _F 4.60 mv 114 _C _F 6.14 mv 87 _C _F 4.65 mv 115 _C _F 6.19 mv 88 _C _F 4.71 mv 116 _C _F 6.25 mv 89 _C _F 4.77 mv 117 _C _F 6.30 mv 90 _C _F 4.82 mv 118 _C _F 6.36 mv 91 _C _F 4.87 mv 119 _C _F 6.42 mv 92 _C _F 4.93 mv 120 _C _F 6.47 mv 93 _C _F 4.98 mv 121 _C _F 6.53 mv

19 Electrical ystem Thermocouple Voltage Charts (contd.) Table 11-2 Thermocouple Voltage as a Function of Temperature (contd.) Temperature Voltage Temperature Voltage 94 _C _F 5.04 mv 122 _C _F 6.58 mv 95 _C _F 5.09 mv 123 _C _F 6.64 mv 96 _C _F 5.15 mv 124 _C _F 6.69 mv 97 _C _F 5.20 mv 125 _C _F 6.75 mv 98 _C _F 5.26 mv 126 _C _F 6.81 mv 99 _C _F 5.32 mv 127 _C _F 6.86 mv 100 _C _F 5.37 mv 128 _C _F 6.92 mv 101 _C _F 5.42 mv 129 _C _F 6.97 mv 130 _C _F 7.03 mv 158 _C _F 8.60 mv 131 _C _F 7.09 mv 159 _C _F 8.65 mv 132 _C _F 7.14 mv 160 _C _F 8.71 mv 133 _C _F 7.20 mv 161 _C _F 8.77 mv 134 _C _F 7.25 mv 162 _C _F 8.82 mv 135 _C _F 7.31 mv 163 _C _F 8.88 mv 136 _C _F 7.37 mv 164 _C _F 8.93 mv 137 _C _F 7.42 mv 165 _C _F 8.99 mv 138 _C _F 7.48 mv 166 _C _F 9.05 mv 139 _C _F 7.53 mv 167 _C _F 9.10 mv 140 _C _F 7.59 mv 168 _C _F 9.16 mv 141 _C _F 7.65 mv 169 _C _F 9.21 mv 142 _C _F 7.70 mv 170 _C _F 9.27 mv 143 _C _F 7.76 mv 171 _C _F 9.33 mv 144 _C _F 7.81 mv 172 _C _F 9.38 mv 145 _C _F 7.87 mv 173 _C _F 9.44 mv 146 _C _F 7.93 mv 174 _C _F 9.49 mv 147 _C _F 7.98 mv 175 _C _F 9.55 mv 148 _C _F 8.04 mv 176 _C _F 9.61 mv 149 _C _F 8.09 mv 177 _C _F 9.66 mv 150 _C _F 8.15 mv 178 _C _F 9.72 mv 151 _C _F 8.21 mv 179 _C _F 9.77 mv 152 _C _F 8.26 mv 180 _C _F 9.83 mv 153 _C _F 8.32 mv 181 _C _F 9.89 mv 154 _C _F 8.37 mv 182 _C _F 9.94 mv

20 11-16 Electrical ystem 11. Thermocouple Voltage Charts (contd.) Table 11-2 Thermocouple Voltage as a Function of Temperature (contd.) Temperature Voltage Temperature Voltage 155 _C _F 8.43 mv 183 _C _F mv 156 _C _F 8.49 mv 184 _C _F mv 157 _C _F 8.54 mv 185 _C _F mv 186 _C _F mv 214 _C _F mv 187 _C _F mv 215 _C _F mv 188 _C _F mv 216 _C _F mv 189 _C _F mv 217 _C _F mv 190 _C _F mv 218 _C _F mv 191 _C _F mv 219 _C _F mv 192 _C _F mv 220 _C _F mv 193 _C _F mv 221 _C _F mv 194 _C _F mv 222 _C _F mv 195 _C _F mv 223 _C _F mv 196 _C _F mv 224 _C _F mv 197 _C _F mv 225 _C _F mv 198 _C _F mv 226 _C _F mv 199 _C _F mv 227 _C _F mv 200 _C 392.0_F mv 228 _C _F mv 201 _C _F mv 229 _C _F mv 202 _C _F mv 230 _C _F mv 203 _C _F mv 231 _C _F mv 204 _C _F mv 232 _C _F mv 205 _C _F mv 233 _C _F mv 206 _C _F mv 234 _C _F mv 207 _C _F mv 235 _C _F mv 208 _C _F mv 236 _C _F mv 209 _C _F mv 237 _C _F mv 210 _C _F mv 238 _C _F mv 211 _C _F mv 239 _C _F mv 212 _C _F mv 240 _C _F mv 213 _C _F mv 241 _C _F mv 242 _C _F mv 243 _C _F mv

21 Electrical ystem Thermocouple Voltage Charts (contd.) Table 11-2 Thermocouple Voltage as a Function of Temperature (contd.) Temperature Voltage Temperature Voltage 244 _C _F mv 245 _C _F mv 246 _C _F mv 247 _C _F mv 248 _C _F mv 249 _C _F mv 250 _C _F mv 251 _C _F mv 252 _C _F mv 253 _C _F mv 254 _C _F mv 255 _C _F mv 256 _C _F mv 257 _C _F mv 258 _C _F mv 259 _C _F mv 260 _C _F mv 12. Electrical ervice Kits and pare Parts Table 11-3 CF-200 Electrical ervice Kits and pare Parts Part Description Note ensor, Thermocouple PTFE, Thermocable Heater A NOTE A: Refer to the applicator parts list in ection 8 for the heater part numbers.

22 11-18 Electrical ystem