Trane CVHE Information Manual page 80

DIAGNOSTIC DESCRIPTION
Momentary Power Loss
Motor Temp Sensor #1
Motor Temp Sensor #2
Motor Temp Sensor #3
MPL Detect Circuit Inoperative
Oil Pressure Sensor Calibration
Oil Pump Discharge Pressure
Sensor
Oil Sump Pressure Sensor
Oil Temp Sensor
Options: Loss of Comm with
Starter
Options: Loss of Comm with
Chiller
Information Manual
Diag Module Diag.
Type that Active
Called Modes
Diag.
MAR Starter All
Running
Modes
(Start
Mode,
e.g.
Before
Transition
MMR Circuit All
MMR Circuit All
MMR Circuit All
MMR Starter All
MMR Circuit All Non-
running
Modes
and not
for 5
minutes
after
running.
MMR Circuit All
MMR Circuit All
MMR Circuit All
IFW Options All
IFW Options All
CAUSE
Open or Short
Open or Short
Open or Short
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.
The recalibration of the Differential Oil Pressure
sensors resulted in an error correction of greater
than 3 PSID.
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.
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.
Open or Short
The options module lost communications with
the Starter module for 15 contiguous seconds.
The options module lost communications with
the Chiller module for 15 contiguous seconds.
Diagnostics Menu
Help Message
Determine
Cause Of Power
Interruption
Check Sensor,
Wiring And
Connections
Check Sensor,
Wiring And
Connections
Check Sensor,
Wiring And
Connections
See
Troubleshooting
Service Bulletin
See
Troubleshooting
Service Bulletin
Check Sensor,
Wiring, and
Connections
Check Sensor,
Wiring, and
Connections
Check Sensor,
Wiring And
Connections
Check IPC
Wiring/
Connections
Check IPC
Wiring/
Connections
75