KOMAC00607-09EN 37
Alarms and Events
Situations may arise that require some action from the chiller or that should be logged
for future reference. A condition that requires a shutdown and/or lockout is an alarm.
Alarms may cause a normal stop (with pumpdown) or a rapid stop. Most alarms require
manual reset, but some reset automatically when the alarm condition is corrected. Other
conditions can trigger what is known as an event, which may or may not cause the
chiller to respond with a specific action in response. All alarms and events are logged.
Signaling Alarms
The following actions will signal that an alarm has occurred:
1. The unit or a circuit will execute a rapid or pumpdown shutoff.
2. An alarm bell icon will be displayed in the upper right-hand corner of all
controller screens including the optional remote user interface panel’s screens.
3. An optional field supplied and wired remote alarm device will be activated.
Clearing Alarms
Active alarms can be cleared through the keypad/display or a BAS network. Alarms are
automatically cleared when controller power is cycled. Alarms are cleared only if the
conditions required to initiate the alarm no longer exist. All alarms and groups of alarms
can be cleared via the keypad or network via LON using nviClearAlarms and via
BACnet using the ClearAlarms object
To use the keypad, follow the Alarm links to the Alarms screen, which will show Active
Alarms and Alarm Log. Select Active Alarm and press the wheel to view the Alarm List
(list of current active alarms). They are in order of occurrence with the most recent on
top. The second line on the screen shows Alm Cnt (number of alarms currently active)
and the status of the alarm clear function. Off indicates that the Clear function is off and
the alarm is not cleared. Press the wheel to go to the edit mode. The Alm Clr (alarm
clear) parameter will be highlighted with OFF showing. To clear all alarms, rotate the
wheel to select ON and enter it by pressing the wheel.
An active password is not necessary to clear alarms.
If the problem(s) causing the alarm have been corrected, the alarms will be cleared,
disappear from the Active Alarm list and be posted in the Alarm Log. If not corrected,
the On will immediately change back to OFF and the unit will remain in the alarm
condition.
Remote Alarm Signal
The unit is configured to allow field wiring of a alarm devices. See Figure 17 on
page 58 for field wiring information.
Description of Alarms
Phase Volts Loss/GFP Fault
Alarm description (as shown on screen): Unit PVM/GFP Fault
Trigger: PVM set point is set to Single Point and PVM/GFP input is low
Action Taken: Rapid stop all circuits
Reset: Auto reset when PVM input is high or PVM set point does not equal single
point for at least 5 seconds.
Evaporator Flow Loss
Alarm description (as shown on screen): Evap Water Flow Loss
Trigger:
1: Evaporator Pump State = Run AND Evaporator Flow Digital Input = No Flow
for time > Flow Proof Set Point AND at least one compressor running
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