Operating instructions

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100

8.2.3. Warning 34 Appears even though Communication is Establish-

If the PLC is in stop mode Warning 34 will appear. Check that the PLC is in run mode.

8.2.4. Drive Will Not Respond to Control Signals

Check 1: Is the Control word valid?

If bit 10=0 in the Control word, then the drive will not accept the Control word, because the default

setting is bit 10=1. Set bit 10=1 via the PLC.

Check 2: Is the relationship between bits in the Control word and the terminal I/Os correct?

Check the logical relationship in the drive.

Set the logic to bit 3=1 AND digital input=1 in order to achieve a successful start.

Define the desired logical relationship in par. 8-50 to 8-56 according to the following range of

options. Select the FC control mode, digital input and/or serial communication, using par. 8-50 to

8-56.

The tables below show the effect upon the frequency converter of a coast command for the full

range of par. 8-50 settings.

The effect of control mode upon the function of par. 8-50

Coasting select

, 8-51

Quick stop se-

lect

and 8-52

DC Brake select

is as follows:

Digital input

[0] is selected, the terminals

will control the Coast and DC Brake functions.

NB!

Please note that Coasting, Quick Stop and DC brake functions are active for logic

“0’’.

Digital input [0]

Terminal Bit 02/03/04 Function

0 0 Coast/DC brake/Q-Stop

0 1 Coast/DC brake/Q-Stop

1 0 No Coast/DC brake/Q-Stop

1 1 No Coast/DC brake/Q-Stop

If Serial communication [1] is selected, com-

mands will be activated only when given via

serial communication.

Serial communication [1]

Terminal Bit 02/03/04 Function

0 0 Coast/DC brake/Q-Stop

0 1 No Coast/DC brake/Q-Stop

1 0 Coast/DC brake/Q-Stop

1 1 No Coast/DC brake/Q-Stop

If Logic AND [2] is selected, both signals must

be activated to perform the function.

Logic AND [2]

Terminal Bit 02/03/04 Function

0 0 Coast/DC brake/Q-Stop

0 1 No Coast/DC brake/Q-Stop

1 0 No Coast/DC brake/Q-Stop

1 1 No Coast/DC brake/Q-Stop

8. Troubleshooting VLT

Profibus

MG.33.C4.02 - VLT

is a registered Danfoss trademark