Troubleshooting - Danfoss VLT FC 102 Operating Instructions Manual

Diagnostics and Troubleshoo...

7.5 Troubleshooting

Symptom
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.
Display 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 or
a fault within the frequency
Intermittent display
converter.
Service switch open or missing
motor connection.
No mains power with 24 V DC
option card.
LCP Stop.
Missing start signal (Standby).
Motor not running
Motor coast signal active
(Coasting).
Wrong reference signal source.
Motor rotation limit.
Motor running in wrong
Active reversing signal.
direction
Wrong motor phase connection.
MG16I302
Operating Instructions
Possible cause
See Table 5.1.
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.
®
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 mains power is
applied to the frequency converter.
Check if [Off] has been pressed.
Check parameter 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 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.
Danfoss A/S © 04/2015 All rights reserved.
Test
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] + [
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 shorts 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 mains 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
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 4.6.1 Motor Cable.
Solution
▲ ▼
]/[ ] to adjust
7
81
7