Parameters 24-** Application Functions - Danfoss VLT AQUA Drive FC 200 Programming Manual

Parameter Description
3.21 Parameters 24-** Application
Functions 2
Parameter group for application monitoring functions.
3 3
3.21.1 24-1* Drive Bypass
Function for activation of external contactors to bypass the
adjustable frequency drive for direct online operation of
the motor, in case of trip.
24-10 Drive Bypass Function
Option:
[0] Disabled
[1] Enabled
[2] Enabled
(Fire M
Only)
CAUTION
Important! After enabling the Drive Bypass Function, the
Safe Stop function (in versions, where included) no longer
complies with standard EN 954-1, Cat. 3 installations.
3-146
VLT
Function:
This parameter determines what circumstances
will activate the Drive Bypass Function:
If in normal operation, the automatic Drive
Bypass Function is activated in the following
conditions:
At a Trip Lock or a Trip. After the programmed
number of reset attempts, programmed in
14-20 Reset Mode or if the bypass delay timer
(24-11 Drive Bypass Delay Time) expires before
reset attempts have been completed
When in Fire mode, the Bypass Function will
operate under the 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.
The bypass function will operate at trip at critical
alarms, coast or bypass delay timer if the timer
expires before reset attempts have completed.
MG20O622 - VLT
®
AQUA Drive Programming Guide
24-11 Drive Bypass Delay Time
Range:
0 s [0 -
*
600 s]
®
is a registered Danfoss trademark
Function:
Programmable in 1 s increments. Once the Bypass
Function is activated in accordance with the setting
in 24-10 Drive Bypass Function, the Bypass Delay
Timer begins to operate. If the adjustable frequency
drive has been set for a number of restart attempts,
the timer will continue to run while the adjustable
frequency drive tries to restart. If the motor restarts
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 5-40 Function Relay. If a [Relay Delay] has
also been programmed in 5-41 On Delay, Relay,
[Relay] or 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
parameter and will then activate the Drive Bypass
relay, which will have been programmed for Bypass
in 5-40 Function Relay, Function Relay. If a Relay
Delay has also been programmed in 5-41 On Delay,
Relay, On Delay, Relay or 5-42 Off Delay, Relay,
[Relay], then this time must also elapse before the
relay action is performed.