Technical information

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
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 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.
[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.
CAUTION
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 24-10 Drive Bypass Function, the Bypass Delay
Timer begins to operate. If the frequency 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 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.
24-11 Drive Bypass Delay Time
Range: Function:
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.
24-90 Missing Motor Function
Option: Function:
Select the action to be taken if the motor current
is below the limit calculated as a function of the
output frequency. The function is used for
detecting e.g. a missing motor in multi-motor
applications.
[0] * Off
[1] Warning
24-91 Missing Motor Coefficient 1
Range: Function:
0.0000 * [-10.0000 -
10.0000 ]
Enter the cubic coefficient of the
Missing Motor detection function
multiplied by 1000.
24-92 Missing Motor Coefficient 2
Range: Function:
0.0000 * [-100.0000 -
100.0000 ]
Enter the quadratic coefficient of
the Missing Motor detection
function multiplied by 1000.
24-93 Missing Motor Coefficient 3
Range: Function:
0.0000 * [-100.0000 -
100.0000 ]
Enter the linear coefficient of
the Missing Motor detection
function.
24-94 Missing Motor Coefficient 4
Range: Function:
0.000 * [-500.000 - 500.000 ] Enter the constant of the Missing
Motor detection function.
24-95 Locked Rotor Function
Option: Function:
Select the action to be taken if the motor current
is above the limit calculated as a function of the
output frequency. The function is used for
detecting e.g. a locked rotor in multi-motor
applications.
[0] * Off
[1] Warning
Parameter Description
VLT
®
HVAC Drive Programming Guide
MG11CD02 - VLT
®
is a registered Danfoss trademark 173
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