Training Classes: The Control

Transcription

1 Lakewood, W The Control We must provide a way of controlling the flow of electricity between the power source and the load. There are many forms of buttons and release mechanisms, but for this class we will go over the products that ROFU carries. From a simple mechanical device such as a toggle switch to a complex electrical device such as a fingerprint reader, they all break or make the electrical circuit. Here are brief descriptions of 3 possible choices for a switch: Unrestricted use: The use of this device is free to all who wish to gain access through a particular opening. s is obvious with the mechanical controls, no degree of authority is needed to operate them. Controls such as break glass and pull stations are free to be operated by anyone but by their nature of their operation are meant to discourage their use for releasing a lock or other sort of emergency. Unrestricted electronic controls would be programmed to release a lock whenever a person entered an area in close proximity to the opening. Installed on the secure side of the opening. Restricted use: This device requires that a person has authorization to do so before they could activate or deactivate a system. They would need to know a code, have a key, a proximity card or a like device to gain access to the opening. Some of today s high- security devices even require verification of the user through such personal identification as a fingerprint, voice or retina recognition. utomatic control: ny device that releases a lock according to some pre-programmed condition is an automatic control. In mechanical controls, a switch might be wired in such a manner as to lock or un-lock a door whenever another door or piece of equipment was used. These situations are used in X-Ray rooms, Interlocks (man-traps), and elevator door controls. Terminology used when specifying a CONTROL NO: Normally Open. The circuit will be open until the switch actuator is operated. NC: Normally closed. The circuit will be closed until the switch actuator is operated. : s soon as the button is released it returns to its previous state. Holding the button down will either make or break the circuit, depending on if you wired the NC or NO contacts. Maintained: est described as a push/pull action, similar to a light switch. Pushing the button in and it will maintain this position until it is pushed again (like a light switch). SPST: single pole, single throw. The switch has only one moving contact and one stationary contact; it is either normally open (NO) or normally closed (NC). : single pole, double throw. The switch has one moving contact and two stationary contacts (NO & NC); when operated, the contacts reverse states. DP: double pole. It is available in single throw and double throw configurations; it allows for two separate circuits to be opened simultaneously from one switch. D: double breaking. This type of configuration (form X, Y, Z) provides the same circuits as Form, and C except that when activated, the pole makes or breaks a circuit from two contact points. Form Z can be converted to form C by adding a jumper to one side. 1

2 Lakewood, W Contact Forms: SPST-NO (Form ) SPST-NO-D (Form X) SPST-NC (Form ) SPST-NC-D (Form Y) (Form C) -D (Form Z) DPST-NO (Form ) DPST-NO-D (Form XX) DPST-NC (Form ) DPST-NC-D (Form YY) DPDT (Form CC) DPDT-NC-D (Form ZZ) 2

3 Lakewood, W Common Contact Forms: SPST-NO: Single pole, single throw, normally open switch keeps circuit - open. This could be used in a system with a fail secure device. When the switch is operated, contact closes, completing circuit -. Electricity would flow to the device causing it to release. SPST-NC SPST-NC: Single pole, single throw, normally closed switch keeps circuit - closed. This could be used in a system with a fail safe device. When the switch is operated, contact opens, breaking the circuit -. Electricity would cease to flow to lock, causing it to release. SPST-NO : Single pole, double throw switch provides a closed circuit, - and an open circuit, -C. This could be used in systems with a fail safe device in circuit - and a light in circuit -C. When the switch is operated, circuit - opens, releasing the device and circuit -C closed, turning the light on. The device and light would have to be rated at the same voltage. C X -D (Form Z) -D: Single pole, double throw, form Z switch provides two separate circuits one closed (-) and one open (X-Y). This switch could operate the same as a system (above), except that the device and light could be different voltages. Each circuit is totally separate and could be wired to two different low voltage power supplies. Y C X DPDT DPDT: Double pole, double throw switch provides a set of NO and NC contact for controlling two separate circuits. The swingers of each contact set are mechanically attached together, as indicated by the dotted line (Not to be confused with a Double, which are independent). Whenever the switch is operated, both contact sets change position simultaneously. When shown on a drawing, the contact set may be drawn in separate locations for convenience. They will be identified as belonging to one switch; that is; the switch may be labeled S1 and the contact sets labeled S1- and S1-. Y Z 3

4 Lakewood, W ROFU Control Products: lways specify US28 or US40 Finish 9200 Series Key Switches /250V-15/125V (2) 10/250V-15/125V (2) 9201 w/led 10/250V-15/125V 9202 Pneumatic Time Delay 10/250V-15/125V 9210 Maintained 10/250V-15/125V 9211 w/ LED Maintained 10/250V-15/125V 9220 Narrow (1 5/8 x 4 ¾ ) 10/250V-15/125V 9221 w/ LED Narrow (1 5/8 x 4 ¾ ) 10/250V-15/125V 9222 Pneumatic Time Delay Narrow (1 5/8 x 4 ¾ ) 10/250V-15/125V 9230 Maintained Narrow (1 5/8 x 4 ¾ ) 10/250V-15/125V 9231 w/ LED Maintained Narrow (1 5/8 x 4 ¾ ) 10/250V-15/125V 9300 Series Request to Exit utton lue utton Standard measures 15/16 x 9/16 Exit available, 12v or 24v bulb available, Optional button colors available / 250VC DPDT 9301 Double utton 6 / 250VC DPDT 9302 Triple utton 6 / 250VC DPDT 9303 Electronic Time Delay 6 / 250VC DPDT 9310 Maintained 6 / 250VC DPDT 9320 Narrow (1 5/8 x 4 ¾ ) 6 / 250VC DPDT 9321 Double utton Narrow (1 5/8 x 4 ¾ ) 6 / 250VC DPDT 9322 Triple utton Narrow (1 5/8 x 4 ¾ ) 6 / 250VC DPDT 9323 Electronic Time Delay Narrow (1 5/8 x 4 ¾ ) 6 / 250VC DPDT 9330 Maintained Narrow (1 5/8 x 4 ¾ ) 6 / 250VC DPDT 9350 & 9360 Illuminated 2 x 2 Request to Exit utton 9350 is Green utton with Push to Exit (P.T.E.) 9360 is lue button with Handicapped Logo (H.L.) Electronic Time Delay available /24 Green w/p.t.e lue w/h.l lue w/h.l 12V/24 Lamp 12V LED 24V LED 10-1/2HP 125/250VC 10-1/2HP 125/250VC 10-1/2HP 125/250VC 4

5 Lakewood, W ROFU Control Products: lways specify US28 or US40 Finish 9400 Mushroom Exit Switches 1 ½ Red Mushroom / Contact blocks are stackable to /400V SPST-NO /400V SPST-NC 9410 Maintained 10/400V SPST-NO 9411 Maintained 10/400V SPST-NC 9420 Narrow (1 5/8 x 4 ¾ ) 10/400V SPST-NO 9421 Narrow (1 5/8 x 4 ¾ ) 10/400V SPST-NC 9430 Maintained Narrow (1 5/8 x 4 ¾ ) 10/400V SPST-NO 9431 Maintained Narrow (1 5/8 x 4 ¾ ) 10/400V SPST-NC 9470 Mushroom Exit Switches 1 9/16 Mushroom 9470/9480 lue Mushroom w/ Handicapped Logo /600VC (1NO & 1NC) 9480 Narrow (1 5/8 x 4 ¾ ) 10/600VC (1NO & 1NC) 9600 Mushroom Exit Switches 2 3/8 Red Mushroom / Contact blocks are stackable to /400V /400V /400V SPST-NC 9620 Narrow (1 5/8 x 4 ¾ ) 10/400V SPST-NO 9621 Narrow (1 5/8 x 4 ¾ ) 10/400V SPST-NC SPST-NO SPST (1NO & 1NC) 9700 Red Flush Head Exit Switches 1 ¼ Red Metallic Flush Head / Contact blocks are stackable to /400V SPST-NO /400V SPST-NC 9720 Narrow (1 5/8 x 4 ¾ ) 10/400V SPST-NO 9721 Narrow (1 5/8 x 4 ¾ ) 10/400V SPST-NC lso available: ROFU 1010 (under the desk) - Switch. ROFU 1015 (under the desk) DPDT Switch. 5