Thermo King T-1000R, Maintenance Manual

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Operating Instructions Premium HMI 6-19
Prevent Alarms
Prevent Alarms are also indicated by a steady Alarm Icon in the display. The remote indicator alarm light (if installed) will
be on. The unit will attempt to resolve the situation as shown below.
• The unit will be temporarily shut down if a Prevent Alarm is active.
• The unit will remain shut down for a timed restart interval or until the fault conditions are corrected.
• If the unit is in a temporary shutdown, Alarm Code 84 Restart Null will be present along with the associated Prevent Alarm.
• The unit will restart and run (in most cases with forced reduced performance) to determine if continued operation is possible.
The unit will run in this manner for a timed interval. If the unit is running with forced reduced performance, Alarm Code 85
Forced Unit Operation will also be present under some conditions.
• If the alarm does not reoccur during the timed running interval with reduced performance, the unit will return to full
performance to determine if continued operation is possible. The unit will run in this manner for a timed interval. If the unit
is successfully able to return to full performance for the timed interval without the alarm re-occurring, the alarm is auto
cleared and the unit will run normally.
• All Prevent Alarm events and conditions are logged by the ServiceWatch Data Logger.
• In general, if the alarm condition re-occurs a defined number of times, the alarm is set as a shutdown alarm and no further
restarts are possible.
Note: If the Restart After Shutdown feature in the Guarded Access Menu is set for CONTINUOUS, then an unlimited number
of restart attempts are allowed.
Zone Level Prevent Alarms (SPECTRUM)
A Zone Level Prevent Alarm will force the affected zone into a temporary shutdown, but allow the unit to continue to run as required by the
host unit or other zones.
• A small Alarm Icon will appear next to the affected zone.
• If a Zone Prevent Alarm occurs in all zones then the unit will be forced into a unit level Prevent shut down.
Pretrip Alarm Codes
If an alarm occurs during a Pretrip Test the alarm code will be displayed as Pretrip Alarm XX, where XX is the alarm code.
Alarm Codes When Switching Between Diesel and Electric
If a shutdown alarm occurs that affects only diesel mode operation and the unit is switched to electric, the diesel mode
shutdown alarm becomes an electric mode log alarm. This allows the unit to run in electric mode without clearing the shutdown
alarm that is preventing diesel mode operation. If the unit is switched back to diesel mode, the alarm again become a diesel mode
shutdown alarm and prevents unit operation.
In the same manner, if a shutdown alarm occurs that affects only electric mode operation and the unit is switched to diesel, the
electric mode shutdown alarm becomes a diesel mode log alarm to allow diesel mode operation. If the unit is switched back to
electric mode, the alarm reverts to an electric mode shutdown alarm and prevents unit operation. If the unit is configured for
electric to diesel autoswitch, it automatically starts and runs in diesel mode if an electric shutdown occurs.
Alarm Code Notification
The Alarm Icon used in previous Thermo King controllers has been incorporated. If a Check alarm condition occurs the Alarm
Icon will appear in the display as shown.
Alarm Icon
If a Shutdown Alarm occurs it will be indicated by all of the following:
1. The Alarm Icon will appear.
2. The display and backlight will flash on and off.
3. The display will switch from normal video to reverse video and back to normal video. (Light areas become dark and dark areas become
light.)
Clearing Alarm Codes
Most alarm codes can be cleared conventionally from the Alarm Menu using the CLEAR key.
The following control and display sensor alarm codes can only be cleared from the Maintenance Menu or Guarded Access
Menu:
• Alarm Code 03 Check Control Return Air Sensor
• Alarm Code 04 Check Control Discharge Air Sensor