Keyscan Technical Guide (PC109x - 04.12)
32
Terminate Wiring at the
ACU
The following sub-sections review terminating lock, input, elevator, reader and auxiliary output wiring at the
access control units.
OCB-8 Relay Board
Keyscan’s OCB-8 relay board is used for terminating door locks, magnetic locks, elevator relays, and
alarm/auxiliary outputs at the access control unit.
Table 3 – OCB-8 Specifications
OCB-8 Specifications
OCB-8 Power Requirements 12 VDC – 230 mA
Relay Outputs Form C contacts, 30 VDC 5 Amps, 24 VAC 10 Amps
# of Outputs 8
Dimensions 8.6 cm x 12.5 cm (3 3/8” x 4 7/8”)
Operating Environment Temperature: 0° to 49° C (32° to 120° F)
Humidity: 0% to 90% R.H., non-condensing
Terminate Lock Wiring
A separate power supply must be used for door strikes and other 12 VDC equipment. The power supply should
have battery backup for continued operation during a power failure. When adding equipment to an existing
system, be sure the power supply can withstand the increased current consumption.
To calculate total current requirements for power supplies, use the following formula that includes a 30%
tolerance factor:
• Total Current = (Device A amps + Device B amps + Device C amps, etc.) x 1.30
Example
An installation calls for 1 magnetic lock and 3 door strikes requiring 12 VDC:
• Mag Lock – 100 mA + Door Strike A – 200 mA + Door Strike B – 200 mA + Door Strike C – 200 mA x
1.30 = 910 mA
In this example, a separate 1 amp power supply is sufficient.
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