Troubleshooting - Danfoss FC 103 Instruction Manual

Maintenance, Diagnostics an...

7.5 Troubleshooting

Symptom Possible cause
Display Missing input power
dark/No
Missing or open fuses or circuit
function
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
Intermittent Overloaded power supply
display (SMPS) due to improper control
wiring or a fault within the
adjustable frequency drive
Motor not Service switch open or missing
running 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
Motor running Motor rotation limit
in wrong
direction
Active reversing signal
Wrong motor phase connection
MG16E322
Instruction Manual
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 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 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.
Danfoss A/S © Rev. 2014-04-10 All rights reserved.
Solution
Check the input power source.
Follow the recommendations provided.
Replace the faulty LCP or connection cable.
Wire the terminals properly.
Use only 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 chapter 5.5 Checking Motor Rotation.
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