Motor Will Not Run - Danfoss VLT HVAC Drive FC 100 Service Manual

High Power Service Manual for VLT
Adjustable Frequency Drives

4.5.3 Motor Will not Run

In the event that this symptom is detected, first verify that the unit is properly powered 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 adjustable frequency drive. Such
occurrences will result in one or more of the following status messages being displayed.
LCP Stop
The [OFF] key has been pressed. Line 2 of the display will also flash when this occurs.
Press the [AUTO ON] or [HAND ON] key.
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
(6.3.16).
Unit ready
Terminal 27 is low (no signal).
Ensure that terminal 27 is logic "1". Refer to the Input Terminal Signal Test (6.3.16).
Run OK, 0 Hz
This indicates that a run command has been given to the adjustable frequency drive but the
reference (speed command) is zero or missing.
Check the control wiring to ensure that the proper reference signal is present at the adjustable
frequency drive input terminals and that the unit is properly programmed to accept the signal
provided. Refer to the Input Terminal Signal Test (6.3.16).
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 adjustable frequency drive is being controlled via the serial communication bus.
A correct control word must be transmitted to the adjustable frequency drive over the communi-
cation bus to correct this.
STOP
One of the digital input terminals 18, 19, 27, 29, 32, or 33 (parameter 5-1*) is programmed for
Stop Inverse
Ensure that the above parameters are programmed correctly and that any digital input program-
Stop Inverse
med for
Display Indication That the Unit is Functioning, but No Output
Make sure that par. 14-22
If the unit is equipped with an external 24 VDC option, check that main power is applied to the
adjustable frequency drive.
Note: In this case, the display will alternately flash Warning 8.
®
FC Series
and the corresponding terminal is low (logic "0").
is high (logic "1").
Operation Mode
MG.90.L1.22 - VLT ® is a registered Danfoss trademark
Run With Inverter Disabled
is not set to
4 Troubleshooting
4
.
4-5