Danfoss FC 100 Series Operating Instructions Manual page 91

How to Programme the Frequ...
22-44 Wake-up Ref./FB Difference
Range: Function:
10 % [0 - 100 Only to be used if par. 1-00 Configuration Mode
*
%] is set for Closed Loop and the integrated PI
controller is used for controlling the pressure.
Set the pressure drop allowed in percentage of
set point for the pressure (Pset) before cancel-
ling the Sleep Mode.
NOTE
If used in application where the integrated PI controller
is set for inverse control (e.g. cooling tower applications)
in par. 20-71 PID Performance, the value set in
par. 22-44 Wake-up Ref./FB Difference will automatically
be added.
22-45 Setpoint Boost
Range: Function:
0 [-100 - Only to be used if par. 1-00 Configuration Mode, is
% 100 %] set for Closed Loop and the integrated PI controller
*
is used. In systems with e.g. constant pressure
control, it is advantageous to increase the system
pressure before the motor is stopped. This will
extend the time in which the motor is stopped and
help to avoid frequent start/stop.
Set the desired over pressure/temperature in
percentage of set point for the pressure (Pset)/
temperature before entering the Sleep Mode.
If setting for 5%, the boost pressure will be
Pset*1.05. The negative values can be used for e.g.
cooling tower control where a negative change is
needed.
22-46 Maximum Boost Time
Range: Function:
60 s [0 - 600 Only to be used if par. 1-00 Configuration Mode is
*
s] set for Closed Loop and the integrated PI control-
ler 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, not waiting for the set boost
pressure to be reached.
22-60 Broken Belt Function
Selects the action to be performed if the Broken Belt condition is
detected
Option: Function:
[0] Off
*
[1] Warning 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.
[2] Trip The drive will stop running and activate a Broken
Belt alarm [A 95]. A drive digital output or a serial
®
VLT HVAC Drive Operating Instructions
22-60 Broken Belt Function
Selects the action to be performed if the Broken Belt condition is
detected
Option:
NOTE
Do not set par. 14-20 Reset Mode, to [13] Infinite auto
reset, when par. 22-60 Broken Belt Function is set to [2]
Trip. Doing so will cause 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's automatic bypass function,
if [2] Trip is selected as the Broken Belt Function.
22-61 Broken Belt Torque
Range:
10 %
22-62 Broken Belt Delay
Range:
10 s
22-75 Short Cycle Protection
Option:
[0]
[1]
22-76 Interval between Starts
Range:
Application
dependent
®
MG.11.AD.02 - VLT is a registered Danfoss trademark
Function:
communication bus can communicate an alarm to
other equipment.
Function:
[0 - 100 %] Sets the broken belt torque as a percentage
*
of the rated motor torque.
Function:
[0 - 600 s] 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.
Function:
Disabled Timer set in par. 22-76 Interval between Starts is
*
disabled.
Enabled Timer set in par. 22-76 Interval between Starts is
enabled.
Function:
[Application Sets the time desired as minimum
dependant] time between two starts. Any
*
normal start command (Start/Jog/
Freeze) will be disregarded until
the timer has expired.
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