CMU-212 Cabinet Monitor Unit
Operations Manual
Eberle Design Inc.
Page 16
may not be considered active. The CMU-212 will report the state of this input in the Type
189 frame.
3.3.4 FTR COIL DRIVE STATUS
The cabinet should be wired such that the FTR COIL DRIVE STATUS input is connected to
the FTR COIL DRIVE signal in the AC SIGNAL POWER BUS. An active signal on this input
indicates the flash transfer relays are energized and the field signals are driven from the
load switch outputs. This input will be considered active when the input voltage exceeds 89
Vrms. This input will not be considered active when the input voltage is less than 70 Vrms.
Signals between 89 Vrms and 70 Vrms may or may not be considered active. The CMU-
212 will report the state of this input in the Type 189 frame.
3.3.5 CIRCUIT BREAKER (CB) TRIP STATUS
The cabinet should be wired such that the CB TRIP STATUS input will be connected to the
Auxiliary Switch output of the circuit breaker unit. The active state of this input indicates that
the circuit breaker unit is not in the tripped state. This input will be considered active when
the input voltage exceeds 89 Vrms. This input will not be considered active when the input
voltage is less than 70 Vrms. Signals between 89 Vrms and 70 Vrms may or may not be
considered active. The CMU-212 will report the state of this input in the Type 189 frame.
3.3.6 FRONT / REAR DOOR SWITCH
The cabinet should be wired such that AC+ is applied to the DOOR SWITCH FRONT or
DOOR SWITCH REAR inputs when the respective door is Open. These inputs will be
considered active (door open) when the input voltage exceeds 89 Vrms. These inputs will
not be considered active (door closed) when the input voltage is less than 70 Vrms. Signals
between 89 Vrms and 70 Vrms may or may not be considered active. The CMU-212 will
report the state of these inputs in the Type 189 frame.
The Datakey not present will cause a LFSA if the DOOR SWITCH FRONT input is sensed
as not active (door closed). See section 2.14.3.
3.4 MONITOR INTERLOCK
The MONITOR INTERLOCK input is connected to VDC GROUND within the CMU-212.
The cabinet should be wired such that the lack of VDC GROUND on this pin forces the
cabinet to the flash mode. This prevents a cabinet from operating without a CMU-212
installed.
3.5 EXTERNAL TEST RESET INPUT
The EXTERNAL TEST RESET input is used to reset the CMU-212 from the FSA condition.
When the EXTERNAL TEST RESET input is connected to VDC GROUND (True) all front
panel indicators will be illuminated for 100 msec and the OUTPUT relay energized.
Continuously activating the input will not affect CMU-212 operation.
The EXTERNAL TEST RESET input is intended for use in testing the CMU-212 and should
not be connected in the cabinet.
3.6 SERIAL BUS #1 ADDRESS INPUTS
The Address Select input pins ADDRESS 0 and ADDRESS 1 define the Serial Bus #1
address of the CMU. The pins are left open for a logical False, and are connected to VDC
GROUND for a logical True.
ADDRESS 1 ADDRESS 0 SB #1 ADDRESS
