Basic Troubleshooting; Start Up And Operation - Danfoss VLT FC 103 Operating Instructions Manual

Basic Troubleshooting

9 Basic Troubleshooting

9.1 Start Up and Operation

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Display dark/No function
Intermittent display
Motor not running
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VLT Refrigeration Drive Operating Instructions
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
Wrong 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 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
MG16J102 - VLT is a registered Danfoss trademark
Test
See Table 3.1
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 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 mains power is
applied to the frequency converter.
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?
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, 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
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.
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