Troubleshooting - Danfoss VLT AQUA FC 202 Operating Instructions Manual

Maintenance, Diagnostics an...
ALARM 85, Dang fail PB
PROFIBUS/PROFIsafe error.
ALARM 92, No flow
A no-flow condition has been detected in the system.
22-23 No-Flow Function is set for alarm. Troubleshoot the
system and reset the frequency converter after the fault
has been cleared.
ALARM 93, Dry pump
A no-flow condition in the system with the frequency
converter operating at high speed may indicate a dry
pump. 22-26 Dry Pump Function is set for alarm.
Troubleshoot the system and reset the frequency converter
after the fault has been cleared.
ALARM 94, End of curve
Feedback is lower than the set point. This may indicate
leakage in the system. 22-50 End of Curve Function is set for
alarm. Troubleshoot the system and reset the frequency
converter after the fault has been cleared.
ALARM 95, Broken belt
Torque is below the torque level set for no load, indicating
a broken belt. 22-60 Broken Belt Function is set for alarm.
Troubleshoot the system and reset the frequency converter
after the fault has been cleared.

7.5 Troubleshooting

Symptom Possible cause
Missing input power
Missing or open fuses or circuit
breaker tripped
No power to the LCP
Shortcut on control voltage
(terminal 12 or 50) or at control
Display
terminals
dark/No
Incompatible LCP (LCP from
function
®
VLT 2800 or 5000/6000/8000/
FCD or FCM)
Wrong contrast setting
Display (LCP) is defective
Internal voltage supply fault or
SMPS is defective
Overloaded power supply
(SMPS) due to improper control
Intermittent
wiring or a fault within the
display
frequency converter
MG20MB02
Operating Instructions
ALARM 100, Derag limit fault
The Deragging feature failed during execution. Check the
pump impeller for blockage.
WARNING/ALARM 104, Mixing fan fault
The fan monitor checks that the fan is spinning at
frequency converter power-up or whenever the mixing fan
is turned on. If the fan is not operating, the fault is issued.
The mixing-fan fault can be configured as a warning or an
alarm trip by 14-53 Fan Monitor.
Troubleshooting
•
WARNING 250, New spare part
A component in the frequency converter has been
replaced. Reset the frequency converter to resume normal
operation.
WARNING 251, New typecode
The power card or other components have been replaced
and the typecode changed.
Troubleshooting
•
Test
See Table 4.3.
See open fuses and tripped circuit breaker
in this table for possible causes.
Check the LCP cable for proper connection
or damage.
Check the 24 V control voltage supply for
terminals 12/13 to 20-39 or 10 V supply for
terminals 50-55.
Test using a different LCP.
To rule out a problem in the control wiring,
disconnect all control wiring by removing
the terminal blocks.
Danfoss A/S © Rev. 05/2014 All rights reserved.
Cycle power to the frequency converter to
determine if the warning/alarm returns.
Reset to remove the warning and resume normal
operation.
Solution
Check the input power source.
Follow the recommendations provided.
Replace the faulty LCP or connection cable.
Wire the terminals properly.
Use only LCP 101 (P/N 130B1124) or LCP
102 (P/N 130B1107).
▲ ▼
Press [Status] + [ ]/[
contrast.
Replace the faulty LCP or connection cable.
Contact supplier.
If the display stays lit, the problem is in
the control wiring. Check the wiring for
short circuits or incorrect connections. If
the display continues to cut out, follow the
procedure for display dark.
7
] to adjust the
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