Troubleshooting - Danfoss VLT AQUA Drive FC 202 Operating Instructions Manual

Maintenance, Diagnostics an...

7.5 Troubleshooting

Symptom
Display
dark/No
function
7 7
Intermittent
display
Motor not
running
Motor running
in wrong
direction
48
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
frequency converter.
Service switch is open or
missing 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 rotation limit.
Active reversing signal.
Wrong motor phase
connection.
Danfoss A/S © 01/2015 All rights reserved.
®
VLT AQUA Drive FC 202
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.
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 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.
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
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 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.
Programme the 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.
Programme the correct settings.
Deactivate reversing signal.
See chapter 5.5 Checking Motor Rotation.
MG20MC22