
113 of 222 pages
Operating and service manual
425
Frequency too high
Warning
Description
Power Frequency Too High Warning
Cause
Power generator adjusted to too high frequency
Trouble
shooting
Possible causes:
•
The power frequency is out of specified range.
Accompanied alarms:
•
AL 423 may also be active.
Trouble shooting:
1) Adjust the frequency of the power generator to a lower frequency.
2) Verify that power frequency is within specified range.
3) Apply correct voltage to the unit
Criteria
Power frequency above 66 Hz
Controller
action
Mcond, Mevap1 and Mevap2 fan motors forced to low speed
Log
X
Alarm
X
Alarm light
Off
Consequence
Reduced capacity of unit
Elimination
Power frequency within range again
Log data
Parm 1
Parm 2
Parm 3
Parm 4
Parm 5
Active/Inactive Frequency
426
Frequency too high
Alarm
Description
Power Frequency Too High Alarm
Cause
Power generator adjusted to too high frequency
Trouble
shooting
Possible causes:
•
The power frequency is out of specified range.
Accompanied alarms:
•
AL 423 or AL 425 may also be active.
Trouble shooting:
1) Adjust the frequency of the power generator to a lower frequency.
2) Verify that power frequency is within specified range.
3) Apply correct voltage to the unit.
Criteria
Power frequency above 66 Hz for 5 min. or above 70 Hz
Controller
action
Mcond, Mevap1 and Mevap2 fan motors forced to low speed
Log
X
Alarm
X
Alarm light
Off
Consequence
Reduced capacity of unit
Elimination
Power frequency within range again
Log data
Parm 1
Parm 2
Parm 3
Parm 4
Parm 5
Active/Inactive Frequency