Danfoss VLT AHF 005 User Manual

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Symptom
Possible cause
Test
Solution
Wrong contrast setting.
–
To adjust the contrast, press [Status] +
[▲]/[▼].
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 dis-
play
Overloaded supply (SMPS)
due to improper control wir-
ing or a fault within the AC
drive.
To rule out a problem in the con-
trol wiring, disconnect all control
wiring by removing the terminal
blocks.
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.
Motor not run-
ning
Service switch open or miss-
ing motor connection.
–
Connect the motor and check the
service switch.
No mains power with 24 V DC
option card.
–
Apply mains power.
LCP stop.
–
Depending on the operating mode,
press [Auto On] or [Hand On].
Missing start signal (Standby).
–
Apply a valid start signal.
Motor coast signal active
(Coasting).
–
Apply 24 V on terminal 27 or program
this terminal to [0] 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 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.
Motor running
in wrong direc-
tion
Motor rotation limit.
Check that parameter 4-10 Motor
Speed Direction is programmed cor-
rectly.
Program correct settings.
Active reversing signal.
Check if a reversing command is
programmed for the terminal in
parameter group 5-1* Digital inputs.
Deactivate reversing signal.
Wrong motor phase connec-
tion.
–
Correct motor phase connection, or
set parameter 1-06 Clockwise Direction
to [1] Inverse.
Motor is not
reaching maxi-
mum speed
Frequency limits set wrong.
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.
Program correct limits.
Reference input signal not
scaled correctly.
Check reference input signal scal-
ing in parameter group 6-0* Analog
Program correct settings.
AQ262141314214en-000301 / 130R0880152 | Danfoss A/S © 2021.11
Maintenance, Diagnostics, and
Troubleshooting
VLT® HVAC Drive FC 102
Operating Guide

Danfoss VLT AHF 005 Specifications

General

Brand	Danfoss
Model	VLT AHF 005
Category	DC Drives
Language	English