Appendix H - Pre-Alert Relay; Table 33 - Ocb-8 Power Specifications; Table 34 - Pre-Alert Relay To Door Assignments - Keyscan CA250 Series Technical Manual

Appendix H – Pre-alert
Relay
The optional pre-alert relay advises when a door remains open at the half interval of the Door Held Open Time
/ Exit Delay field in the Client software. This function is a feature within the control board and may be wired to
an external device. To use the Pre-alert Relay option on CA4500B or CA8500B control boards, an additional
OCB-8 is required.
Unit
OCB-8
Pre-alert
Depending on the number of doors and type of controller, ensure that the Pre-alert Relay on the output control
board matches the correct Door Contact as indicated in the following table.
Control Board/OCB-8
CA250B/OCB-8
CA4500B/OCB-8 (optional)
CA8500B/OCB-8 (optional)
Important
All relays on the OCB-8 board are dedicated as Pre-alert output relays when used on the CA8500B circuit
board.
The Pre-alert relay is also activated on an "alarm tripped".
Keyscan Technical Guide (PC109x - 04.12)
Table 33 – OCB-8 Power Specifications
Power
12 VDC, 230 mA
Table 34 – Pre-alert Relay to Door Assignments
Pre-alert Pre-alert
Outputs Relay # on
OCB
2 Relay 7
Relay 8
4 Relay 5
Relay 6
Relay 7
Relay 8
8 Relay 1
Relay 2
Relay 3
Relay 4
Relay 5
Relay 6
Relay 7
Relay 8
Notes
Door Ribbon Cable Connection
Contact
#
Door 1 Connect ribbon on OCB-8 to Control
1 on CA250B
Door 2
Door 1 Connect ribbon on OCB-8 to Control
2 on CA4500B.
Door 2
(Relays 1 to 4 for Auxiliary Outputs
Door 3
5 to 8.)
Door 4
Door 1 Connect ribbon on OCB-8 to Control
3 on CA8500B.
Door 2
Door 3
Door 4
Door 5
Door 6
Door 7
Door 8
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