Diagnostics Menu
Information Manual 75
Momentary Power Loss MAR Starter All
Running
Modes
(Start
Mode,
e.g.
Before
Transition
Determine
Cause Of Power
Interruption
Motor Temp Sensor #1 MMR Circuit All Open or Short Check Sensor,
Wiring And
Connections
Motor Temp Sensor #2 MMR Circuit All Open or Short Check Sensor,
Wiring And
Connections
Motor Temp Sensor #3 MMR Circuit All Open or Short Check Sensor,
Wiring And
Connections
MPL Detect Circuit Inoperative MMR Starter All A failure was detected in the Momentary Power
Loss detect circuit. If there are no zero cross
interrupts on Vab for 637.5 msec (Prior to
Centravac Upgrade 4: approx. 3 half line cycles),
the timer interrupt will trip and generate a
diagnostic that indicates that our ability to detect
MPL is gone. If Vab was truly gone the module
would be powered down so if we can detect that
Vab is gone then there must be a hardware
failure on the board.
See
Troubleshooting
Service Bulletin
Oil Pressure Sensor Calibration MMR Circuit All Non-
running
Modes
and not
for 5
minutes
after
running.
The recalibration of the Differential Oil Pressure
sensors resulted in an error correction of greater
than 3 PSID.
See
Troubleshooting
Service Bulletin
Oil Pump Discharge Pressure
Sensor
MMR Circuit All Open or shorted input.
Must Hold on open AND short input is 2.0 Psia.
Design: Both opens and shorts result in the
pressure going to the low end of the scale.
Therefore a Must Hold on the high pressure end
is not required.
Check Sensor,
Wiring, and
Connections
Oil Sump Pressure Sensor MMR Circuit All Open or shorted input.
Must Hold on open AND short input is 2.0 Psia.
Design: Both opens and shorts result in the
pressure going to the low end of the scale.
Therefore a Must Hold on the high pressure end
is not required.
Check Sensor,
Wiring, and
Connections
Oil Temp Sensor MMR Circuit All Open or Short Check Sensor,
Wiring And
Connections
Options: Loss of Comm with
Starter
IFW Options All The options module lost communications with
the Starter module for 15 contiguous seconds.
Check IPC
Wiring/
Connections
Options: Loss of Comm with
Chiller
IFW Options All The options module lost communications with
the Chiller module for 15 contiguous seconds.
Check IPC
Wiring/
Connections
DIAGNOSTIC DESCRIPTION
Diag
Type
Module
that
Called
Diag.
Diag.
Active
Modes
CAUSE Help Message
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