Danfoss VLT DriveMotor FCP 106 Programming Manual page 112

Parameters
22-50 End of Curve Function
Option:
[3] Man.
Reset
Alarm
4 4
22-51 End of Curve Delay
Range:
10 s [0 -
*
600 s]
4.16.5 22-6* Broken Belt Detection
Use broken-belt detection in both closed-loop 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), and the
frequency converter output frequency is above or equal to
15 Hz, parameter 22-60 Broken Belt Function is performed.
22-60 Broken Belt Function
Selects the action to be performed if the broken-belt condition is
detected.
Option:
[0] Off
*
[1] Warning The frequency converter continues to run, but
[2] Trip
WARNING
Do not set parameter 14-20 Reset Mode, to [13] Infinite
auto reset, when parameter 22-60 Broken Belt Function is
set to [2] Trip. Doing so causes the frequency converter
to continuously cycle between running and stopping
when a broken-belt condition is detected.
110
VLT
Function:
The frequency converter stops running and
activates an end-of-curve alarm (Alarm 94, End of
curve). A frequency converter digital output or a
fieldbus can communicate an alarm to other
equipment.
Function:
When an end-of-curve condition is detected, a
timer is activated. When the time set in this
parameter expires, and the end-of-curve
condition is steady during the entire period, the
function set in parameter 22-50 End of Curve
Function is activated. If the condition disappears
before the timer expires, the timer is reset.
Function:
activates a broken-belt warning Warning 95,
Broken Belt. A frequency converter digital output
or a serial communication bus can communicate
a warning to other equipment.
The frequency converter stops running and
activates a broken-belt alarm Alarm 95, Broken
Belt. A frequency converter digital output or a
serial communication bus can communicate an
alarm to other equipment.
Danfoss A/S © 11/2015 All rights reserved.
®
DriveMotor FCP 106/FCM 106
NOTICE
If the automatic bypass function is enabled, the bypass
starts when the frequency converter experiences a
persistent alarm condition. In this case, disable the
automatic bypass function if [2] Trip is selected as the
broken-belt function.
22-61 Broken Belt Torque
Range:
10 % [5 - 100 %] Sets the broken-belt torque as a percentage
*
22-62 Broken Belt Delay
Range:
10 s [0 - 600
*
s]
4.16.6 22-8* Flow Compensation
In certain applications, it is not possible for a pressure
transducer to be placed at a remote point in the system,
and it can only be located close to the fan/pump outlet.
Flow compensation operates by adjusting the setpoint
according to the output frequency, which is almost propor-
tional to flow. Thus, it compensates for higher losses at
higher flow rates.
H (required pressure) is the setpoint for closed-loop
DESIGN
(PI) operation of the frequency converter and is set as for
closed-loop operation without flow compensation.
Illustration 4.20 Flow Compensation Set-up
There are 2 methods which can be employed, depending
on whether the speed at system design working point is
known.
Function:
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 parameter 22-60 Broken
Belt Function.
MG03N202