Troubleshooting - Danfoss VLT AutomationDrive FC 302 Operating Manual

Maintenance, Diagnostics, a...

8.6 Troubleshooting

Symptom Possible cause
Display Missing input power.
dark/No
Missing or open fuses.
function
No power to the LCP.
Shortcut on control voltage
(terminal 12 or 50) or at control
terminals.
Incompatible LCP (LCP from
®
VLT 2800 or 5000/6000/8000/
FCD or FCM).
Wrong contrast setting.
Display (LCP) is defective.
Internal voltage supply fault or
SMPS is defective.
Intermittent Overloaded supply (SMPS) due
display to improper control wiring or a
fault within the AC drive.
Motor not Service switch open or missing
running motor connection.
No mains power with 24 V DC
option card.
LCP Stop.
Missing start signal (Standby).
Motor coast signal active
(Coasting).
Wrong reference signal source.
Motor Motor rotation limit.
running in
wrong
Active reversing signal.
direction
Wrong motor phase
connection.
MG38A202
Operating Guide
Test
See Table 5.5.
See Open power fuses in this table for possible
causes.
Check the LCP cable for proper connection or
damage.
Check the 24 V control voltage supply for
terminal 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.
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 there is no
output, check that mains power is applied to
the AC drive.
Check if [Off] has been pressed.
Check parameter 5-10 Terminal 18 Digital Input
for correct setting for terminal 18. Use default
setting.
Check parameter 5-12 Terminal 27 Digital Input
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 parameter 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.
–
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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, the problem is in
the control wiring. Check the wiring for
shorts or incorrect connections. If the
display continues to cut out, follow the
procedure for Display dark/No function.
Connect the motor and check the service
switch.
Apply mains power.
Press [Auto On] or [Hand On] (depending
on operating mode).
Apply a valid start signal.
Apply 24 V on terminal 27 or program
this terminal to [0] No operation.
Program correct settings. Check
parameter 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 chapter 6.5.1 Warning - Motor Start.
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