8 Troubleshooting
Problem
Check
Yes/no
Action
The system does not start
Is the green LED on the drive
PCB lit?
No
Check power supply to drive. If power is applied
properly, but the LED is not lit, there is an internal
fault in the drive. Replace the drive.
Yes
Power is applied. Check next issue
Is the green LED is blinking?
Yes
The drive indicates a problem. Read the status
register for fault analysis.
No
Check next issue
Improper wiring between drive
and compressor?
Yes
Fix the wiring while observing the order of motor
phases
No
Check next issue
Does the drive respond to
queries from the master
controller?
No
•
Is the baud rate set correctly?
•
Is the parity set correctly?
•
Is the number of stop bits set correctly?
•
Are the node addresses correct? (Default: Drive
162 and 163, EEVs 164 and 165)
•
Is the cable between motor and drive properly
shielded?
Yes
Check next issue
Is a system status present that
prevents the drive from starting?
(read status register no. 40121)
Yes
•
Cycle power to the drive (remove power for at
least 1 minute)
•
Read the alarm register again and check if an
alarm is still present. If yes, remove alarm
conditions
•
Supply voltage low
: Check power supply
•
Over temperature
: Let the system cool
down
•
Over current
: Replace compressor
•
EEV indoor failure
: Check wiring to
indoor EEV controller
•
EEV outdoor failure
: Check wiring to
outdoor EEV controller
•
Ambient temperature invalid
: Check
wiring and function of ambient
temperature sensor
•
If
discharge temerature invalid
, check
wiring and function of duscharge
temperature sensor
•
If
suction pressure invalid
, check wiring
and function of suction pressure
transmitter
•
If
condenser pressure invalid
, check
wiring and function of condenser
pressure transmitter
•
If
internal fault
, replace drive
Table 8.1 Troubleshooting Guide
Troubleshooting
VLT
®
Inverter Scroll CDS 801 Operating Instructions
MG10V402 - VLT
®
is a registered Danfoss trademark
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