NB!
The Drive Bypass cannot be deactivated if in Fire Mode. It can be deactivated only by either removing the Fire Mode command signal
or the power supply to the frequency converter!
When the Drive Bypass function is activated, the display on the Local Control Panel will show the status message Drive Bypass. This message has a higher
priority than the Fire Mode status messages. When the automatic Drive Bypass function is enabled, it will cut in the external bypass according to the
below sequence:
24-10 Drive Bypass Function
Option: Function:
This parameter determines, what circumstances will activate the Drive Bypass Function:
[0]
*
Disabled (No Bypass
Function)
[1] Enabled
[2] Enabled
(Fire M Only)
If in normal operation the automatic Drive Bypass Function will be activated at following conditions:
At a Trip Lock or a Trip. After the programmed number of reset attempts, programmed in
par. 14-20, Reset Mode
or if the Bypass Delay Timer (par.
24-11) expires before reset attempts have been completed
When in Fire Mode, the Bypass Function will operate under following conditions:
When experiencing a trip at critical alarms, a Coast or if the Bypass Delay Timer expires before reset attempts have completed when [2] Enabled in Fire
Mode. The Bypass Function will operate at trip at critical alarms, Coast or if the Bypass Delay Timer expires before reset attempts have been completed.
VLT
®
HVAC Drive Programming Guide 3. Parameter Description
MG.11.C5.02 - VLT
®
is a registered Danfoss trademark
207
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