Emerson Copeland EV2 Series, Application Engineering Bulletin

Page: 25 / 27

EEPROM fault 1. DSP self-check error, restart the drive and fault
should go away.
2. If problem persists, replace the drive. MICRO
FAULT
14 DC Bus Voltage Low
DC Bus Voltage is below 380V. Check the AC power
supply and if the right voltage is supplied according to
the drive model.
The drive running condition is not stable. Check the
compressor load and makes sure it is OK. Restart the
drive again. If problem persist, replace the drive.
79 81 0 DC VOLTAGE
LOW
15 AC Input Current
Fold Back Timeout.
1. Check the line voltage if it is < 500VAC.
2. Check the compressor is operating with in
specified limits.
3. If problem persists, replace the drive.
79 81 4 INPUT OC
FOLDBACK
TIMEOUT
16 Modbus
Communication Lost
1. Check mod-bus communication cable connections.
2. Check the communication parameters are set right.
3. Power cycle the drive.
4. If problem persists, replace the drive.
79 81 7 MODBUS
COMMS
LOST
17 Sensor 2
(Thermistor, DLT)
High Temp
1. Check the DLT/Scroll Thermistor connection.
2. Check the compressor is operating with in
specified limits.
79 81 8 DLT TEMP
HIGH
18 Power Module Temp
High
Verify proper airflow over the heat-sink of the drive.
Remove any obstructions. Check that the compressor
is operating within specified limits. Check the
mounting screws on the drive, make sure they are
tight. If the problem, still persists replace the drive.
79 81 11 INVERTER
TEMP HIGH
19 IGBT Temp High Verify proper airflow over the heat-sink of the drive.
Remove any obstructions. Check that the compressor
is operating within specified limits. Check the
mounting screws on the drive, make sure they are
tight. If the problem, still persists replace the drive.
79 81 12 IGBT TEMP
HIGH
20 Power Module
Temp. Fold Back
Timeout
Verify proper airflow over the heat-sink of the drive.
Remove any obstructions. Check that the compressor
is operating within specified limits. Check the
mounting screws on the drive, make sure they are
tight. If the problem, still persists replace the drive.
79 81 3 OVER TEMP
FOLDBACK
TIMEOUT
21
Sensor 1 (High
Pressure Switch
Open)
Condensing Pressure beyond limit, system issue.
78 80 8 HP SWITCH
OPEN
22 Compressor Model
Configuration Error Compressor model and configuration code do not
match 82 84 6 COMPRESSO
R CONFIG
ERROR
23 High Pressure
Sensor Type
Configuration Error
Pressure sensor and configuration code do not match 82 84 7 HP SENSOR
CONFIG
ERROR
24 Sensor 2
(Thermistor, DLT)
Low Temp or Open
1. Check the DLT/Scroll Thermistor connection.
2. Check the resistance of the sensor to ensure
values are with in specified limits. 83 85 2 SENSOR 2
LOW TEMP
OR OPEN
25 Fault Limit Lockout Certain faults have a trip limit, see modbus map for
details 82 84 15 FAULT LIMIT
LOCK OUT
26 Auto Config
Communication
Fault Timeout
Baud rate or Parity of the system controller not
matching with drive. Check whether system controller
is working, then Power Cycle the drive. 79 81 6 AUTO
CONFIG
TIMEOUT
27 Motor Over Speed Check if the compressor is operating within specified
limits. Check if the cables are not shorted. Shutdown
and restart the drive.
82 84 3 MOTOR
OVERSPEED