8. FAULT FINDING
8.1. ERROR CODES
The following codes will show up on display panel and on the appropriate Modbus registers to help you
diagnose the cause of improper operation.
Low load detected. Pump is running dry.
Motor might be faulty or viscous medium is
present.
Converter temperature limit
Circuit is too hot and power was reduced to
less than 2/3 of rated power.
Converter temperature protection
Circuit is too hot to run, pump stopped.
Hardware overcurrent protection triggered.
Line voltage is too high.
Line voltage is too low for proper operation.
Power correction circuit current cannot be
controlled
Software motor protection active
Average motor current was too high, pump
load is much higher than expected.
Device specific error codes
General frequency converter error
Electrical circuitry did not pass self-test.
One of the display segment diodes is faulty
(open/short).
Display board does not detect proper
connection to main board, but power supply
Voltage on DC link shunt (R34) not in expected
range.
Motor temperature outside limits
During MFG. TEST, this is 10 kΩ, 1% resistor
for 10 °C..30 °C
During operation, expected values are -55
Circuit temperature outside limits
During MFG. TEST, this is 0 °C..50
C.
During operation, expected values are -55
Voltage reference outside limits.
Comparison between internal references does
not match.
No test load detected or current
measurement does not work properly (MFG.
Motor parameters out of range
Motor does not behave as expected.
Thermal protection active
Motor temperature is too hot to operate.
Pump model not valid or out of reach
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