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.
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:
Function:
[0]
*
Off
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.
22-26 Dry Pump Function
Select the action for dry-pump operation.
Option:
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.
[1]
Warning
[2]
Alarm
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.
[3]
Man.
Reset
Alarm
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.
Parameters
VLT
®
DriveMotor FCP 106/FCM 106
106
Danfoss A/S © 11/2015 All rights reserved.
MG03N202
4
4
Summary of Contents for VLT DriveMotor FCP 106
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