Faults And Alarms - McQuay WSC Operating Manual

Overload meter
Toggle between the programmed meter display and the overload content by pressing the DOWN
key. The overload will be displayed as "oXXX" where XXX is the overload content. For example
if the overload content is 76 percent, it will be displayed as "o 76".
Phase Order Meter
Toggle between the programmed meter display and the phase order by pressing the UP key. The
phase order will be displayed as "AbC" or "CbA". The phase order must be AbC to operate.
Restoring Factory Parameter Settings
To restore ALL parameters to the factory default settings, press and hold the PARAM and
ENTER pushbutton switch on power up. The display will blink "dFLt". Parameters unique to the
motor starter applications will need to be set again to appropriate values before motor operation

Faults and Alarms

Starter and/or power problems can result in a fault or an alarm that will usually shut down the
compressor and record a "Starter Fault' in the touchscreen's active fault menu. The starter LED
can then be consulted to determine the specific problem based on the code shown in the following
table.
Alarm Reset Type
Table 30, Fault/Alarm Codes, Wye-Delta Starter, Y = Yes, N = No
74
00 No fault
02 Motor Thermal Overload Trip
10 Phase Rotation Error, not ABC
12 Low Line Frequency
13 High Line Frequency
15 Input power not three phase
21 Low Line L1-L2 Voltage
22 Low Line L2-L3 Voltage
23 Low Line L3-L1 Voltage
24 High Line L1-L2 Voltage
25 High Line L2-L3 Voltage
26 High Line L3-L1 Voltage
27 Phase Loss
28 No Line Voltage
30 I.O.C. (Instantaneous Overcurrent)
31 Overcurrent
37 Current Imbalance
38 Ground Fault
39 No Current at Run
40 Open Line or Motor Lead
41 Current While Stopped
48 2M Feedback Fault (on DIN#2, No Transition)
50 Control Power Low
51 Current Sensor Offset Error
52 Burden Switch Error
60 Thermistor Trip (on DIN#1, Input from Motor Thermistor)
71 Analog Input Trip (Not Used)
82 Modbus Timeout (Communication Fault)
94 CPU Error – Software Fault
95 CPU Error – Parameter Storage Fault
Description
Auto Reset
-
N
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
N
N
Y
N
Y
N
N
N
Y
N
N
N
Y
Y
N
N
OM Centrif Micro ΙΙ-5