Danfoss VLT HVAC, Operating Instructions Manual

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9 Basic Troubleshooting
9.1 Start Up and Operation
Symptom Possible Cause Test Solution
Display dark / No function
Missing input power See Table 3.1 . Check the input power source.
Missing or open fuses or circuit
breaker tripped See open fuses and tripped circuit
breaker in this table for possible
causes. Follow the recommendations
provided
No power to the LCP Check the LCP cable for proper
connection or damage. Replace the faulty LCP or
connection cable.
Shortcut on control voltage
(terminal 12 or 50) or at control
terminals Check the 24 V control voltage
supply for terminal 12/13 to 20-39
or 10 V supply for terminal 50 to
55. Wire the terminals properly.
Wrong LCP (LCP from VLT
®
2800
or 5000/6000/8000/ FCD or FCM)
Use only LCP 101 (P/N 130B1124)
or LCP 102 (P/N 130B1107).
Wrong contrast setting
Press [Status] + [
▲
]/[
▼
] to adjust
the contrast.
Display (LCP) is defective Test using a different LCP. Replace the faulty LCP or
connection cable.
Internal voltage supply fault or
SMPS is defective Contact supplier.
Intermittent display
Overloaded power supply (SMPS)
due to improper control wiring or
a fault within the frequency
converter To rule out a problem in the
control wiring, disconnect all
control wiring by removing the
terminal blocks. 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.
Motor not running
Service switch open or missing
motor connection Check if the motor is connected
and the connection is not
interrupted (by a service switch or
other device). Connect the motor and check the
service switch.
No mains power with 24 V DC
option card If the display is functioning but no
output, check that mains power is
applied to the frequency converter. Apply mains power to run the unit.
LCP Stop Check if [Off] has been pressed. Press [Auto On] or [Hand On]
(depending on your operation
mode) to run the motor.
Missing start signal (Standby) Check 5-10 Terminal 18 Digital Input
for correct setting for terminal 18
(use default setting).
Apply a valid start signal to start
the motor.
Motor coast signal active
(Coasting) Check 5-12 Coast inv . for correct
setting for terminal 27 (use default
setting).
Apply 24 V on terminal 27 or
program this terminal to
No
operation.
Wrong reference signal source Check reference signal: Local,
remote or bus reference? Preset
reference active? Terminal
connection correct? Scaling of
terminals correct? Reference signal
available? 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.
Basic Troubleshooting
VLT
®
HVAC Drive Operating Instructions
62 MG11AH02 - VLT
®
is a registered Danfoss trademark
9 9