Parameters: 22-** Application Functions; 22-6* Broken-Belt Detection - Danfoss VLT Midi Drive FC 280 Programming Manual

Parameter Descriptions
4.19 Parameters: 22-** Application
Functions
22-02 Sleepmode CL Control Mode
This parameter is used to set whether feedback is detected for
entering sleep mode in process closed loop.
Option:
[0] Normal
*
[1] Simplified
22-40 Minimum Run Time
Range: Function:
10 s [0 - 600 s] Set the wanted minimum running time for
*
the motor after a start command (digital
input or bus) before entering sleep mode.
22-41 Minimum Sleep Time
Range: Function:
10 s [0 - 600 s] Set the minimum time for staying in sleep
*
mode. This time overrides any wake-up
conditions.
22-43 Wake-Up Speed [Hz]
Range: Function:
10 [ 0 - Only to be used if parameter 1-00 Configuration
*
400.0 ] Mode is set for [0] Open loop, and an external
controller applies speed reference. Set the
reference speed at which the sleep mode
should be deactivated.
22-44 Wake-Up Ref./FB Diff
Range: Function:
10 % [0 - Only to be used if parameter 1-00 Configuration
100 %] Mode is set for [1] Closed loop, and the
*
integrated PI controller is used for controlling
the pressure.
Set the pressure drop allowed in percentage of
setpoint for the pressure (P
the sleep mode.
22-45 Setpoint Boost
Range: Function:
0 % [-100 Only to be used if parameter 1-00 Configuration
- Mode is set for [1] Closed loop, and the integrated
*
100 %] PI controller is used. In systems with for example
constant pressure control, it is advantageous to
increase the system pressure before the motor is
stopped. This extends the time in which the motor
is stopped and helps to avoid frequent start/stop.
MG07C302
Programming Guide
Function:
Detect feedback together
with other parameters.
Do not detect feedback.
Only check sleep speed and
time.
) before canceling
set
Danfoss A/S © 07/2016 All rights reserved.
22-45 Setpoint Boost
Range: Function:
Set the desired overpressure/temperature in
percentage of setpoint for the pressure (P
temperature before entering the sleep mode.
If setting for 5%, the boost pressure is P
The negative values can be used for cooling tower
control where a negative change is needed.
22-46 Maximum Boost Time
Range: Function:
60 [0 - Only to be used when parameter 1-00 Configu-
s 600 s] ration Mode is set for [1] Closed loop, and the
*
integrated PI controller is used for controlling the
pressure.
Set the maximum time for which boost mode is
allowed. If the set time is exceeded, sleep mode is
entered, not waiting for the set boost pressure to
be reached.
22-47 Sleep Speed [Hz]
Range: Function:
0 [ 0 - 400.0 ] Set the speed below which the frequency
*
converter goes into sleep mode.
22-48 Sleep Delay Time
Range: Function:
0 s [0 - 3600 s] Set the delay time that the motor waits
*
before entering sleep mode when the
condition to enter sleep mode is met.
22-49 Wake-Up Delay Time
Range: Function:
0 s [0 - 3600 s] Set the delay time that the motor waits
*
before waking up from sleep mode when the
condition to wake up is met.

4.19.1 22-6* Broken-belt Detection

Use broken-belt detection in both closed-loop systems and
open-loop systems for pumps and fans. If the estimated
motor torque (current) is below the broken-belt torque
(current) value (parameter 22-61 Broken Belt Torque), the
frequency converter output frequency is above or equal to
15 Hz, and the condition has been active for
parameter 22-62 Broken Belt Delay, parameter 22-60 Broken
Belt Function is performed.
22-60 Broken Belt Function
Option: Function:
Select the actions to be performed if the broken-
belt condition is detected.
[0] Off
*
)/
set
x 1.05.
set
4 4
95