Danfoss VLT AutomationDrive FC 300 Series Service Guide

6.5 Fault Symptoms
6.5.1 No Display
•
Check that power is supplied.
•
Cycle power to the unit.
•
Reinitialize the drive (refer to
chapter 4.2.5 Restoring Factory Default Settings).
6.5.2 Intermittent Display
Cutting out or ashing of the entire display and power LED
indicates that the supply (SMPS) is shutting down due to
an overload. Check for:
•
Improper control wiring.
•
Overload of the supply output (18 V, 24 V, 48 V).
•
Fault within the drive.
Check for a problem in the control wiring by disconnecting
all control wiring from the control terminal blocks on the
installation card.
If the display stays lit, then the problem is in the control
wiring (external to the drive). Check all control wiring for
shorts or incorrect connections.
If the display continues to cut out, refer to chapter 6.5.1 No
Display.
6.5.3 Motor Does Not Run
If this symptom is detected, rst verify that the unit is
properly powered up (display is lit) and that no warning or
alarm messages are shown. The most common cause is
either incorrect control logic or an incorrectly programmed
drive. Such occurrences result in 1 or more of the following
status messages being shown.
Cause: LCP Stop
Action: The
[O] key has been pressed.
Press the [Auto On] or [Hand On] key.
Cause: Standby
This condition indicates that there is no start signal at
terminal 18.
Action: Ensure that a start command is present at terminal
18. Refer to chapter 8.5.14 Input Terminal Signal Tests.
Cause: Unit ready
Terminal 27 is low (no signal).
Action: Ensure that terminal 27 is logic 1. Refer to
chapter 8.5.14 Input Terminal Signal Tests.
Run OK, 0 Hz
This message indicates that a run command has been
given to the drive, but the reference (speed command) is 0
or missing.
To ensure that the proper reference signal is present at the
drive input terminals, check the control wiring. Also check
that the unit is programmed properly to accept the signal.
Refer to chapter 8.5.14 Input Terminal Signal Tests.
O 1 (2 or 3)
This message indicates that bit #1 (or #2, or #3) in the
control word is logic 0. This situation only occurs when the
drive is being controlled via the eldbus.
A correct control word must be transmitted to the drive
over the communication bus to correct this error.
STOP
One of the digital input terminals 18, 19, 27, 29, 32, or 33
(parameter group 5-1* Digital Inputs) is programmed for [6]
Stop Inverse. The corresponding terminal is low (logic 0).
Ensure that the parameters are programmed correctly and
that any digital input programmed for [6] Stop Inverse is
high (logic 1).
DC undervolt
If the unit is equipped with an external 24 V DC option,
check that mains power is supplied to the drive.
6.5.4 Incorrect Motor Operation
Occasionally, a fault occurs when the motor continues to
run, but not in the correct manner. Possible causes are
listed by symptom.
Wrong speed; unit does not respond to command
Cause: Possible incorrect reference (speed command).
Action: Check that the unit is programmed correctly for the
relevant reference signal, and that all reference limits are
set correctly. To check for faulty reference signals, see
chapter 8.5.14 Input Terminal Signal Tests.
Motor speed unstable
Cause:
•
Incorrect parameter settings.
•
Faulty current feedback circuit.
•
Loss of motor (output) phase.
Action: Check the settings of all motor parameters,
including motor compensation settings such as slip
compensation and load compensation. For closed-loop
operation, check PID settings. To check for faulty reference
signals, refer to chapter 8.5.14 Input Terminal Signal Tests. To
check for loss of motor phase, refer to chapter 8.5.9 Output
Imbalance of Motor Voltage and Current.
Troubleshooting
VLT
®
FC Series, D1h–D8h, Da2/Db2/Da4/Db4, E1h–E4h, J8/J9
62 Danfoss A/S © 02/2019 All rights reserved. MG94A502
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Danfoss VLT AutomationDrive FC 300 Series Specifications

General

Brand	Danfoss
Model	VLT AutomationDrive FC 300 Series
Category	DC Drives
Language	English