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Accelerometer Interface Module Operation Manual
voltage is between approximately -22 Vdc and -25 Vdc then either the
acceleration or velocity field wiring or the interface module is defective.
Reconnect the power and common wiring to the interface module but do
not connect the signal wiring. If the voltage between the -24Vdc and COM
terminals remains outside the range of -22 to -25 Vdc (-18 Vdc to -25 Vdc
for barriers), then the interface module is defective and should be replaced
with a spare. If the voltage is within the limits then the velocity or
acceleration field wiring is defective.
4.3.2 Fault Indication #2:
The voltage between the +VELOCITY and COM terminals is not within the range
of -9 to -11 Vdc ( -11 to -13 Vdc for interface modules which used the CC = 00
option. These interface modules are identified by a 00 in the third option
configurator of the part number which is shown on the interface module
identification plate.)
Probable Cause:
Fault in the Velocity signal field wiring.
Faulty power supply.
Faulty interface module.
Isolation and Correction:
Verify that fault condition #1 does not exist. Disconnect the +VELOCITY
and -VELOCITY wires from the interface module and measure the voltage
between +VELOCITY and COM. If the voltage is within the limits then the
+VELOCITY and/or -VELOCITY field wires are faulty. If the voltage is not
within the limits then the interface module is defective and should be
replaced.
4.3.3 Fault Indication #3:
Signal "spiking", (transient high-amplitude signals that can cause false alarms or
transient not OK indications on the monitor).
Probable Cause:
Faulty or loose extension cable to accelerometer connector.
Faulty or loose extension cable to interface module connector.
Faulty accelerometer mounting.
Faulty extension cable.
Intermittent fault in the interface module to monitor signal wiring.
Faulty interface module.
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