Troubleshooting - Danfoss VLT FC 102 Instruction Manual

Diagnostics and Troubleshoo...

7.4 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
function Wrong LCP (LCP from VLT
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 wiring
Intermittent
or a fault within the adjustable
display
frequency drive
Service switch open or missing
motor connection
No line power with 24 V DC
option card
LCP Stop
Motor not
Missing start signal (Standby)
running
Motor coast signal active
(Coasting)
Wrong reference signal source
Motor rotation limit
Motor running
Active reversing signal
in wrong
direction
Wrong motor phase connection
®
VLT HVAC Drive Instruction Manual
Test
See Table 4.5
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 to 55
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2800
Test using a different LCP
To rule out a problem in the control wiring,
disconnect all control wiring by removing the
terminal blocks.
Check if the motor is connected and the
connection is not interrupted (by a service
switch or other device).
If the display is functioning but no output,
check that line power is applied to the
adjustable frequency drive.
Check if [Off] has been pressed
Check 5-10 Terminal 18 Digital Input for
correct setting for terminal 18 (use default
setting)
Check 5-12 Coast inv. for correct setting for
terminal 27 (use default setting).
Check reference signal: Local, remote or bus
reference? Preset reference active? Terminal
connection correct? Scaling of terminals
correct? Reference signal available?
Check that 4-10 Motor Speed Direction is
programmed correctly.
Check if a reversing command is
programmed for the terminal in parameter
group 5-1* Digital inputs.
MG11AJ22 - Rev. 2013-09-13
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] + [ ]/[ ] to adjust the
contrast.
Replace the faulty LCP or connection cable.
Contact supplier.
If the display stays lit, then 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.
Connect the motor and check the service
switch.
Apply line power to run the unit.
Press [Auto On] or [Hand On] (depending on
operation mode) to run the motor.
Apply a valid start signal to start the motor.
Apply 24 V on terminal 27 or program this
terminal to No operation.
Program correct settings. Check
3-13 Reference Site. Set preset reference
active in parameter group 3-1* References.
Check for correct wiring. Check scaling of
terminals. Check reference signal.
Program correct settings.
Deactivate reversing signal.
See 5.5 Checking Motor Rotation.
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