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

Basic Troubleshooting

9 Basic Troubleshooting

9.1 Start Up and Operation

See Alarm Log in Table 4.1.
Symptom
Display dark / No function
9 9
Intermittent display
Motor not running
60
®
VLT AutomationDrive 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 24V DC
option card
LCP Stop
Missing start signal (Standby)
Motor coast signal active (Coasting) Check 5-12 Coast inv. for correct
Wrong reference signal source
®
MG.33.AJ.02 - VLT
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 24V control voltage
supply for terminal 12/13 to 20-39 or
10V 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 devise).
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 Start for correct setting
for terminal 18 (use default setting).
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?
is a registered Danfoss trademark
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] + Up/Down arrows 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 your operation
mode) to run the motor.
Apply a valid start signal to start the
motor.
Apply 24V on terminal 27 or
programm this terminal to No
operation.
Program correct settings Check 3-13
Reference site. Set preset reference
active in parameter group3-1*
References. Check for correct wiring.
Check scaling of terminals. Check
reference signal.