24-10 Drive Bypass Function
Option: Function:
This parameter determines, what circumstances will activate the Drive Bypass Function:
[0] * Disabled
[1] Enabled 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
Drive Bypass Delay Time
) 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 com-
pleted.
[2] Enabled (Fire M Only) The Bypass Function will operate at Trip at Critical Alarms, Coast or Bypass Delay Timer if the timer
expires before reset attempts have completed.
Important! After enabling the Drive Bypass Function, the Safe Stop function (in versions, where included) is not complying with standard
EN 954-1, Cat. 3 installations anymore.
24-11 Drive Bypass Delay Time
Range: Function:
0 s* [0 - 600 s] Programmable in 1 s increments. Once the Bypass Function is activated in accordance with the
setting in par. 24-10
Drive Bypass Function
, the Bypass Delay Timer begins to operate. If the fre-
quency converter has been set for a number of restart attempts, the timer will continue to run while
the frequency converter tries to restart. Should the motor have restarted within the time period of
the Bypass Delay Timer, then the timer is reset.
Should the motor fail to restart at the end of the Bypass Delay Time, the Drive Bypass relay will be
activated, which will have been programmed for Bypass in par. 5-40
Function Relay
. If a [Relay
Delay] has also been programmed in par. 5-41
On Delay, Relay
, [Relay] or par. 5-42
Off Delay,
Relay
, [Relay], then this time must also elapse before the relay action is performed.
Where no restart attempts are programmed, the timer will run for the delay period set in this pa-
rameter and will then activate the Drive Bypass relay, which will have been programmed for Bypass
in par. 5-40
Function Relay
, Function Relay. If a Relay Delay has also been programmed in
par. 5-41
On Delay, Relay
, On Delay, Relay or par. 5-42
Off Delay, Relay
, [Relay], then this time
must also elapse before the relay action is performed.
3 Parameter Description VLT
®
HVAC Drive Programming Guide
238
MG.11.C9.02 - VLT
®
is a registered Danfoss trademark
3
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