Electrical Access and Exit Control Systems in Visual Studio .NET

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Electrical Access and Exit Control Systems
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Figure 19.56 Model 3900 lock template. (Security Engineering, Inc.)
Template # 3900 electromagnet
6. Firmly tighten all the screws. Install the antitamper plugs into the holes over each socket head mounting screw. Use a soft hammer to avoid damaging the lock case.
Wiring instructions. In some instances, you may use a prefabricated power sup-
ply for the lock unit. What if you do not To achieve the best possible electromagnet lock installation, note the following suggestions (both right and wrong ways are illustrated for each procedure):
Proper placement of the on-off station control in the electrical circuit will ensure instantaneous door release and avoid any delay in complete unlocking (Fig. 19.57). Care must be taken when adding any auxiliary controls or indicators to the electrical circuit. Improper placement may cause a slight delay in door release (Fig. 19.58). Solid state on-off devices must be properly protected from the back voltage generated from the collapsing electromagnetic lock coil when the unit is switched off. This may be accomplished by installing a metal oxide varistor (MOV) across the lock coil lead wires (Fig. 19.59). The MOV is available from Security Engineering; see the address in Appendix B. Installation of the MOV is for arc suppression in ultra-high-usage installations to prevent switch contact deterioration. In any situation, though, the installation of a diode across the leads is not recommended (see Fig. 19.58).
Series 2200 by Security Engineering
Another lock to consider is the surface-mounted electrically actuated lock, the Series 2200 from Security Engineering. This lock (Fig. 19.60) was
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WRONG
ON-OFF CONTROL 110 VAC 12 VAC RECTIFIER
TRANSFORMER
12 VDC #3900 ELECTROMAGNETIC LOCK
RIGHT
ON-OFF CONTROL RECTIFIER
110 VAC
12 VAC
TRANSFORMER
12 VDC #3900 ELECTROMAGNETIC LOCK
Figure 19.57 Model 3900 wiring, Step 1.
WRONG
110 VAC 12 VAC RECTIFIER ON-OFF CONTROL
TRANSFORMER
12 VDC INDICATOR LAMP #3900 ELECTROMAGNETIC LOCK
RIGHT
110 VAC 12 VAC ON-OFF RECTIFIER CONTROL
TRANSFORMER
12 VDC INDICATOR LAMP DIODE
#3900 ELECTROMAGNETIC LOCK
Figure 19.58 Model 3900 wiring, Step 2.
designed to offer the advantages of remote electric locking coupled with a versatility limited only by the user s imagination. For basic operation, the lock mounts to a door frame or a door. When energized, it locks or unlocks the door when the solenoid-operated deadbolt projects from the unit and makes contact with a strike.
Electrical Access and Exit Control Systems
Standard features include the following:
Fail-safe operation. If the power is interrupted, the unit automatically unlocks. Fail-secure operation. If the power is interrupted, the unit automatically unlocks. Easy installation. The unit is not handed and can thus be mounted on any plane. Versatility. It can be used with in-swinging, out-swinging, sliding, overhead, or roll-up doors. Maintenance free. Unit parts are ruggedly built and self-lubricating. Current draw. 0.5 amps at 24 volts.
WRONG
CONTROL VOLTAGE 110 VAC 12 VAC RECTIFIER SOLID STATE SWITCHING DEVICE 12 VDC TRANSFORMER #3900 ELECTROMAGNETIC LOCK
RIGHT
CONTROL VOLTAGE 110 VAC 12 VAC RECTIFIER SOLID STATE SWITCHING DEVICE 12 VDC TRANSFORMER
#3900 ELECTROMAGNETIC LOCK (M.O.V.) METAL OXIDE VARISTOR SECURITY ENGINEERING, INC. #560034
Figure 19.59 Model 3900 wiring, Step 3.
Figure 19.60 Model 2200 series surface-mounted
lock. (Security Engineering, Inc.)
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Low voltage. 24 Vac standard; 24 Vdc, 12 Vac, and 12 Vdc available. Long and silent operation. The unit has a continuous duty solenoid that will function for millions of cycles. Compact size. 2 2 63 4 inches.
The unit has optional features including a choice of one or two signal lights and a built-in bolt position switch to indicate whether or not the bolt is extended or retracted for interfacing with automatic door equipment or signaling the lock status to a remote location unit. Note: The fail-secure locks are not recommended where life safety may be compromised or where panic crash bar hardware is the only means of emergency egress.
Mounting. Refer to Fig. 19.61.
1. Remove the four screws from the unit; remove the housing cover. 2. Manually extend the solenoid bolt by pushing the BPS pin forward (if equipped) or inserting a wire into the rear of the solenoid. 3. Engage the extended solenoid bolt and strike and locate on the door and door frame as shown in the figure. 4. Using the mounting holes in the lock base and strike as templates, mount the solenoid lock and strike with the screws provided. (Several types of strike are available and can be used depending on the situation. See Fig. 19.62.) 5. Check for the proper alignment and see that the lock is free, having no binding in operation. 6. Connect the electrical wiring per the system option or requirements. 7. Check the operation of the lock for any final adjustments; adjust as required. 8. Reinstall the housing cover and secure with screws.
Figure 19.61 Installation procedure for 2200 series lock. (Security Engineering,
Inc.)
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