Danfoss VLT DriveMotor FCP 106 Programming Manual page 108

Parameters
NOTICE
In pump systems, ensure that the minimum speed in parameter 4-11 Motor Speed Low Limit [RPM] or
parameter 4-12 Motor Speed Low Limit [Hz] is set high enough for detection as the pump can run with a rather high
speed even with valves closed.
Dry-pump detection
If the pump has run dry (low power consumption-high speed), no-flow detection can also be used for detecting. Can be
used with both the integrated PI controller and an external PI controller.
4 4
The condition for dry-pump signal:
•
Power consumption below no-flow level.
and
•
Pump running at maximum speed or maximum reference open loop, whichever is lowest.
The signal must be active for a set time (parameter 22-27 Dry Pump Delay) before the selected action takes place.
Possible actions to select (parameter 22-26 Dry Pump Function):
•
Warning
•
Alarm
Enable and commission no-flow detection in parameter 22-23 No-Flow Function and parameter group 22-3* No-Flow Power
Tuning.
22-26 Dry Pump Function
Select the action for dry-pump operation.
Option:
[0] Off
*
106
VLT
Function:
NOTICE
To use dry-pump detection:
1. Enable low-power detection in
parameter 22-21 Low Power
Detection.
2. Commission low-power detection
using parameter group 22-3* No-
flow Power Tuning No-flow Power
Tuning.
NOTICE
Do not set parameter 14-20 Reset Mode to
[13] Infinite auto reset, when
parameter 22-26 Dry Pump Function is set
to [2] Alarm. Doing so causes the
frequency converter to continuously cycle
between running and stopping when a
dry-pump condition is detected.
Danfoss A/S © 11/2015 All rights reserved.
®
DriveMotor FCP 106/FCM 106
22-26 Dry Pump Function
Select the action for dry-pump operation.
Option:
[1] Warning
[2] Alarm
[3] Man.
Reset
Alarm
Function:
NOTICE
For frequency converters with constant-
speed bypass.
If an automatic bypass function starts the
bypass at persistent alarm conditions,
disable the automatic bypass function, if
[2] Alarm or [3] Man. Reset Alarm is
selected as the dry-pump function.
The frequency converter continues to run, but
activates a dry-pump warning (Warning 93, Dry
pump). 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 dry-pump alarm (Alarm 93, Dry
pump). A frequency converter digital output or a
serial communication bus can communicate an
alarm to other equipment.
The frequency converter stops running and
activates a dry-pump alarm (Alarm 93, Dry
pump). A frequency converter digital output or a
serial communication bus can communicate an
alarm to other equipment.
MG03N202