Model 3005 Analog Board. User s Guide

Transcription

1 Siemens Energy, Inc. Oil & Gas Solutions Telge Road Houston, Texas USA Document No. SEI-OG-DLS-005 Page 1 of 6 Siemens AG 2011

2 Table of Contents 1 DESCRIPTION: CONFIGURATION OPERATION SETUP MODEL 3005 ANALOG BOARD SPECIFICATIONS CONTACT INFORMATION... 6 Document No. SEI-OG-DLS-005 Page 2 of 6 Siemens AG 2011

3 1 DESCRIPTION: The Model 3005 is designed to provide a single analog output from Siemens Digital Level Sensors. It provides a 4-20mA signal output for the total fluid level of the tank. As an alternative to the Model 1000 terminal unit, it is intended for use when an analog signal for the tank level is required, and where only one or two tanks are on location. The Model 3005 replaces the fuse board in the explosion-proof housing on top of the Siemens Digital Level Sensor, and provides the same electrical protection. The Model 3005 requires 24 VDC and controls power to the level sensor. It powers the sensor on a pre-programmed schedule, polls for the level analog value, powers the sensor down and outputs the analog signal. The configurations for the Model 3005 are stored in the digital level sensor EEPROM, allowing for easy board replacement if required. 2 CONFIGURATION The single channel, 4-20mA board is designed to interface with Siemens Digital Level Sensors reporting software versions 2.08 and higher. The sensor must be configured to communicate at 9600 baud, no parity, 1 stop bit and a 2 wire RS485 communication line. Three configuration commands are contained within the Siemens Digital Level Sensor firmware to support the 4-20mA interface board. 1) Polling Period in seconds (30 seconds default). 2) 4mA output level in inches (0.0 inches default). 3) 20mA output level in inches (240.0 inches default). The 4-20mA interface board has a pair of jumper pins to configure the output current in case of error. When the pins are shorted the error output current is 4ma. If the pins are open the error output current is 20mA. 3 OPERATION When powered up, the LED on the 4-20 ma interface board will blink until communication with the sensor has been established and a correct software version has been verified. After software verification the sensor is queried for the polling period. Finally, the output current level is requested, output on the 4-20mA current loop, and the level sensor is powered down. This process takes approximately 2 seconds. The 4-20mA output current will be stable until the next poll. The time between the first poll and the second poll is 15 seconds. Thereafter the polling period will be the value configured in the level sensor. If the 4-20mA interface board detects an error condition, the sensor power is cycled, and two more attempts are made to read a valid level. If the error condition persists, the sensor is powered down until the next scheduled poll time. The 4-20mA current loop is set to 4mA or 20mA defined by the jumper placement. The entire polling cycle will be retried at the next poll time. Document No. SEI-OG-DLS-005 Page 3 of 6 Siemens AG 2011

4 4 SETUP The following equipment and components are required: Siemens Digital Level Sensor with v2.08 or later software Personal computer (PC) with terminal emulation software Fuse board for the Siemens Digital Level Sensor RS converter Model 3005 Analog Output board V1.1 of Analog Output board for use with all versions of sensor software above v VDC power supply (to configure sensor) 24VDC power supply ( for 4-20mA operation) 250 ohm resistor to test the 4-20mA output when not connected to a PC or SCADA system Follow these steps to ensure a successful setup. Refer to the connection diagram in Figure Setup the computer to communicate with the sensor communicating at 9600,E,7,1. 2. Connect the 12 VDC power supply and RS485 communications to the sensor, with the fuse board in place. 3. Verify the sensor has the proper software revision, v2.08 or later, by issuing the command U**MV. If the software version is not correct the 4-20mA board will not communicate. 4. Gauge the tank and input the level offset into the level sensor. Verify the electronic level matches the gauged level. If zero and span need to be scaled different than the default values of 0.0 = 4mA and = 20mA, input the new parameters now. The commands are: U**MIN followed by the new level in inches and U**MAX followed by the new level in inches. Following the input of new values the sensor will respond with OK if successful. Also, check the 4-20mA configuration with the following command: U**MC?. 5. Once all parameters are input correctly, change the sensor baud rate and parity by issuing the command U**B9600N81. The sensor will respond with U**BOK. 6. Power the sensor down, change the configuration of the computer to 9600,N,8,1 and request a level U**? 7. If the sensor responds you re ready to continue, if not return to area of failure and try again. 8. Disconnect the RS485 communications from the sensor. Document No. SEI-OG-DLS-005 Page 4 of 6 Siemens AG 2011

5 9. Remove the fuse board. 10. Install the 4-20mA board in the place of the fuse board inside the sensor top housing. 11. Run 24 VDC to the 4-20mA board 24 V and ground terminals. The board sources loop current on A+ and A- terminals. 12. Upon power up with 24 VDC the analog output board will flash it s LED while it retrieves the sensor s 4-20mA configuration, then it will stop flashing and will poll the sensor at the programmed interval, 30 seconds default. Figure 5.1 Connection Diagram Document No. SEI-OG-DLS-005 Page 5 of 6 Siemens AG 2011

6 5 MODEL 3005 ANALOG BOARD SPECIFICATIONS Electrical specifications Operating temperature range: -40 C to +85 C Power requirements: 24 VDC +/- 10% Requires 125mA max Requires two wires for power and two wires for 4-20mA loop 4-20mA conversion accuracy* Resolution: 16 bit Monotonicity: 16 bit min Integral non-linearity: +/ % max Offset: +/- 0.05% max Total output error: +/- 0.15% max 6 CONTACT INFORMATION For further information or for assistance, please contact: Siemens Energy, Inc. Oil & Gas Solutions Telge Road Houston, TX Phone: +1 (888) or +1 (281) oilandgaslcm.energy@siemens.com Web: Document No. SEI-OG-DLS-005 Page 6 of 6 Siemens AG 2011