Troubleshooting - Danfoss VLT AutomationDrive FC 301 Instruction Manual

Maintenance, Diagnostics an...

7.5 Troubleshooting

Symptom
Display
dark/No
function
7 7
Intermittent
display
Motor not
running
Motor
running in
wrong
direction
50
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 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.
Overloaded power supply
(SMPS) due to improper control
wiring or a fault within the
adjustable frequency drive.
Service switch open or missing
motor connection.
No line power with 24 V DC
option card.
LCP Stop.
Missing start signal (Standby).
Motor coast signal active
(Coasting).
Wrong reference signal source. Check reference signal: Local, remote or bus
Motor rotation limit.
Active reversing signal.
Wrong motor phase
connection.
Danfoss A/S © Rev. 09/2014 All rights reserved.
Instruction Manual
Test
See Table 4.4.
See open power 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
terminal 12/13 to 20–39 or 10 V supply for
terminal 50 to 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 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 Terminal 27 Digital Input for
correct setting for terminal 27 (use default
setting).
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.
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 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 chapter 5.5 Checking Motor Rotation in
this manual.
MG33AP22