Danfoss VLT series, Service Manual

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3-4
VLT is a registered Danfoss trademark
3.2 MOTOR
3.2.1 Motor will not run
In the event that this symptom is detected, first verify that the
unit is properly power up (display is lit) and that there are no
warning or alarm messages displayed. The most common
cause of this is either incorrect control logic or an incorrectly
programmed drive. Such occurrences will result in one or more
of the following status messages being displayed.
LCP Stop
The “Stop/Reset” key (VLT 5000) has been pressed. Line 2 of
the display will also be flashing when this occurs.
Press the “Start” key.
Note: For VLT 4000/6000/8000, the status message “Stop”
will be displayed. Pressing the “Hand Start” or “Auto Start” will
correct this.
Standby
This indicates that there is no start signal at terminal 18.
Ensure that a start command is present at terminal 18. Refer
to the Input Terminal Signal Test in Section 5.
Unit ready
Terminal 27 is low (no signal).
Ensure that terminal 27 is logic “1”. Refer to the Input Terminal
Signal Test in Section 5.
Run OK
0 Hz
This indicates that a run command has been given to the
drive but the reference (speed command) is zero or missing.
Check control wiring to ensure that the proper reference signal
is present at the drive input terminals and that the unit is properly
programmed to accept the signal provided. Refer to the Input
Terminal Signal Test in Section 5.
Off 1 (2 or 3)
This indicates that bit #1 (or #2, or #3) in the control word is
logic “0”. This will only occur when the drive is being controlled
via the serial communication bus.
A correct control word must be transmitted to the drive over
the communication bus to correct this.
STOP
(VLT 5000 only)
One of the digital input terminals 16, 17, 27, 29, 32, or 33
(parameters 300, 301, 304, 305, 306, or 307) is programmed
for “Stop Inverse” and the corresponding terminal is low (logic
“0”).
Ensure that the above parameters are programmed correctly
and that any digital input programmed for “Stop Inverse” is
high (logic “1”).
Display Indication That the Unit is Functioning, but No
Output
Check that parameter 620 is not set to “Run With Inverter
Disabled”.
If the unit is equipped with external 24VDC option, check that
the main power is applied to the drive.
Note: In this case, the display will alternately flash Warning 8.