•
•
C
H
IL
L
E
R
C
H
IL
L
E
R
3
3
P
e
3
0
b
b
4
5
4
.1
0
Drive
Drive
Illustration 16: Secondary Pumps
3.1.3 Check Valve Monitoring
In the pump application system, a damaged check valve is hard to detect, which therefore causes low efficiency of the whole sys-
tem. VLT® Flow Drive FC 111 has the ability to monitor the status of check valves in the system. After enabling the check valve moni-
toring function via setting the
parameter 22-04 Check Valve Monitor
to
[1] Enabled
, once a damaged check valve is detected, the
drive trips
warning 159, Check Valve Failure
.
3.1.4 Dry Pump Detection
In the pump application system, the drive monitors the operation status of the system to detect whether there is water on pump's
suction side. If the pump runs at maximum speed and consumes little power, then it can be assumed that there is no water on the
pump's suction side. Via setting the
parameter 22-26 Dry Pump Function
to warning or alarm, once the dry pump condition is detec-
ted, the drive trips
warning/alarm 93, dry pump
.
3.1.5 End of Curve Detection
In the pump application system, the drive monitors the operation status of the system to detect whether the pressure side of pump
is subject to a major leakage. If the pump runs at maximum speed for a defined time period, but the pressure is below the set point,
then it can be considered to reflect the end of curve situation. Via setting the
parameter 22-50 End of Curve Function
to warning or
alarm, once the end of curve condition is detected, the drive trips
warning/alarm 94, end of curve
.
3.1.6 Time-based Functions
In some application scenarios, there are requirements to control the motor running for a specific time, in a specific direction and a
specific speed within a specific time interval. For example, checking the motor status in fire mode or exercising pumps, fans, and
compressors.
For detailed parameter settings, refer to the
parameter group 23-** Time-based Functions
in the drive's Programming Guide.
3.2 Control Structures
3.2.1 Introduction
There are two control modes for the drive:
Open loop.
Closed loop.
Select
[0] Open loop
or
[1] Closed loop
in
parameter 1-00 Configuration Mode
.
AJ363928382091en-000101 / 130R0983
26 | Danfoss A/S © 2021.04
Product Overview
VLT® Flow Drive FC 111
Design Guide