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VLT
®
HVAC Drive Instruction Manual
22-45 Setpoint Boost
Range:
0 %*
[-100 - 100 %]
22-46 Maximum Boost Time
Range:
60 s*
[0 - 600 s]
22-60 Broken Belt Function
Selects the action to be performed if the broken belt condition is detected.
Option:
[0] *
OFF
[1]
Warning
[2]
Trip
NOTE!
Do not set par. 14-20
the drive to continuously cycle between running and stopping when a broken belt condition is detected.
NOTE!
If the drive is equipped with a constant speed bypass with an automatic bypass function that starts the bypass if the drive experiences
a persistent alarm condition, be sure to disable the bypass' automatic bypass function, if [2] Trip is selected as the broken belt function.
22-61 Broken Belt Torque
Range:
10 %*
[0 - 100 %]
22-62 Broken Belt Delay
Range:
10 s
[0 - 600 s]
Function:
Only to be used if par. 1-00
troller is used. For example, in systems with constant pressure control, it is advantageous to increase
the system pressure before the motor is stopped. This will extend the time during which the motor
is stopped and help to avoid frequent start/stop.
Set the desired overpressure/temperature as a percentage of the setpoint for the pressure (Pset)/
temperature before entering sleep mode.
If set at 5%, the boost pressure will be Pset*1.05. The negative values can be used, for example,
for cooling tower control, where a negative change is needed.
Function:
Only to be used if par. 1-00
is used for controlling the pressure.
Set the maximum time for which boost mode will be allowed. If the set time is exceeded, sleep
mode will be entered and will not wait for the set boost pressure to be reached.
Function:
The drive will continue to run, but activate a Broken Belt Warning [W95]. A drive digital output or
a serial communication bus can communicate a warning to other equipment.
The drive will stop running and activate a Broken Belt alarm [A 95]. A drive digital output or a serial
communication bus can communicate an alarm to other equipment.
Reset Mode
to [13] Infinite auto reset when par. 22-60
Function:
Sets the broken belt torque as a percentage of the rated motor torque.
Function:
Sets the time for which the broken belt conditions must be active before carrying out the action
selected in par. 22-60
Broken Belt Function
MG.11.AB.22 - VLT
®
is a registered Danfoss trademark
7 How to Program the Adjustable Frequency
Configuration Mode
, is set for closed-loop and the integrated PI con-
Configuration Mode
is set for closed-loop and the integrated PI controller
Broken Belt Function
is set to [2] Trip. Doing so will cause
.
Drive
7
7-45
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