Compressor Motor Protection Module - Daikin WGZ030DW Operating And Maintenance Manual

Compressor Motor protection Module

The 20, 26, and 30 HP compressors are equipped with an
module that provides protection against:
•
High motor temperature
•
High scroll temperature
•
Phase missing
•
Phase reversal
•
Low control circuit voltage
The module also has a LED display in the upper right-
hand corner that gives information on compressor
operation.
The module is accessible by removing the compressor
motor cover. Additional information can be downloaded
by authorized service technicians using special equipment.
NOTE: If a compressor with CoreSense Communications fails in the field, the CoreSense module should
remain with the failed compressor so the manufacturer can download the CoreSense data to assist with
determining the root cause of compressor failure.
Disconnect the compressor three-phase power before removing the terminal box cover. Removal of the
terminal box cover will expose the three-phase power connections. Contact with them can cause serious
injury or death. Servicing should be done by technicians familiar with this equipment.
Warning Codes (Green LED Flash Code)
•
Code 1 – Loss of Communication: The module will flash the green Warning LED one time
indicating the module has not communicated with the master controller for longer than 5 minutes.
Once communication is reinitiated, the Warning will be cleared.
•
Code 2 – Reserved For Future Use
•
Code 3 – Short Cycling: The module will fl ash the green Warning LED three times indicating the
compressor has short cycled more than 48 times in 24 hours. A short cycle is defined as
compressor runtime of less than 1 minute. The Warning will be activated when the "Short
Cycling" dipswitch (#10) is "off" or in the "down" position. When fewer than 48 short cycles are
accumulated in 24 hours the Warning code will be cleared.
•
Code 4 – Open/Shorted Scroll Thermistor. The module will flash the green Warning LED four
times indicating the scroll NTC thermistor has a resistance value that indicates an open/shorted
thermistor (see Table 2). The Warning will be cleared when the resistance value is in the normal
range.
Alert/Lockout Codes (Red LED Flash Code)
Code 1 – Motor High Temperature: The module will flash the red Alert LED one time indicating
the motor PTC circuit has exceeded 4.5K Ohms. A code 1 Alert will open the M2-M1 contacts.
The Alert will reset after 30 minutes and the M2-M1 contacts will close if the resistance of the
motor PTC circuit is below 2.75K Ohms. Five consecutive Code 1 Alerts will lockout the
compressor. Once the module has locked out the compressor, a power cycle or Modbus reset
command will be required for the lockout to be cleared.
Code 2 – Open/Shorted Motor Thermistor: The module will flash the red Alert LED two times
indicating the motor PTC thermistor circuit has a resistance value that indicates an open/shorted
thermistor chain (see Table 2). A Code 2 Alert will open the M2-M1 contacts. The Alert will reset
after 30 minutes and the M2-M1 contacts will close if the resistance of the motor PTC circuit is
back in the normal range. The module will lockout the compressor if the trip condition exists for
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Warning
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WGZ030D through WGZ200D OMM 1130-2