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VLT Ea4 Parallel Drive Modules
Operating Guide
Symptom
Possible cause
Display (LCP) is defective.
Internal voltage supply fault
or SMPS is defective.
Intermittent dis-
Overloaded supply (SMPS)
play
due to improper control wir-
ing or a fault within the AC
drive.
Motor not run-
Service switch open or miss-
ning
ing 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 running
Motor rotation limit.
in wrong direc-
tion
Active reversing signal.
Wrong motor phase connec-
tion.
Motor is not
Frequency limits set wrong.
reaching maxi-
mum speed
Reference input signal not
scaled correctly.
Danfoss A/S © 2023.01
Test
Test using a different LCP.
–
To rule out a problem in the con-
trol wiring, disconnect all control
wiring by removing the terminal
blocks.
–
–
–
–
–
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 cor-
rectly.
Check if a reversing command is
programmed for the terminal in
parameter group 5-1* Digital inputs.
–
Check output limits in parameter
4-13 Motor Speed High Limit [RPM],
parameter 4-14 Motor Speed High
Limit [Hz], and parameter 4-19 Max
Output Frequency.
Check reference input signal scal-
ing in parameter group 6-0* Analog
I/O mode and parameter group 3-1*
References.
Operating the Drive
Solution
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 shorts or incorrect connections. If
the display continues to cut out, fol-
low the procedure for Display dark\No
function.
Connect the motor and check the
service switch.
Apply mains power.
Depending on the operating mode,
press [Auto On] or [Hand On].
Apply a valid start signal.
Apply 24 V on terminal 27 or program
this terminal to [0] No operation.
Program correct settings. Check pa-
rameter 3-13 Reference Site. Set preset
reference active in parameter group
3-1* References. Check for correct wir-
ing. Check scaling of terminals. Check
reference signal.
Program correct settings.
Deactivate reversing signal.
Correct motor phase connection, or
set parameter 1-06 Clockwise Direction
to [1] Inverse.
Program correct limits.
Program correct settings.
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