3.25.5 29-5* Flow Confirmation
The flow confirmation feature is designed for applications
where there is a need for the motor/pump to run while
waiting for an external event. The flow confirmation
monitor expects to receive a digital input from a sensor on
a gate valve, flow switch, or a similar external device,
indicating that the device is in the open position and flow
is possible. In
parameter 29-50 Validation Time
, define for
how long the VLT
®
AQUA Drive FC 202 waits for the digital
input signal from the external device to confirm the flow.
After the flow is confirmed, the frequency converter checks
the signal again after the flow verification time and then
runs normally. The LCP status reads
Verifying flow
while the
flow monitor is active.
The frequency converter trips with the alarm
Flow Not
Confirmed
if the expected digital input signal becomes
inactive before either the flow validation time or the flow
verification time expires.
130BD766.10
N
MAX
N
MIN
0
0
1
1
0
1
0
1
2
3
4
t0
<t1
t2
T
T
T
T
1
Speed curve.
2
Start command (for example, terminal 18).
3
Digital signal from an external device that confirms that
the flow is possible.
4
Flow verification.
t
0
Start command issued (for example, terminal 18 is set
active).
t
1
Digital signal from an external device becomes active
before
parameter 29-50 Validation Time
expires.
t
2
When
parameter 29-51 Verification Time
passes, the
frequency converter checks the signal from the external
device again and then runs normally.
Illustration 3.115 Flow Confirmation
29-50 Validation Time
Range:
Function:
Size
related
*
[ 0 -
999 s]
NOTICE
Parameter 29-50 Validation Time
is
only visible in the LCP if a digital
input is set to
[86] Flow Confirmation
(see
parameter group 5-1* Digital
Inputs
).
The digital input from an external device
must be active during the validation time.
29-51 Verification Time
Range:
Function:
15 s
*
[ 0.10 -
255 s]
NOTICE
Parameter 29-51 Verification Time
is only
visible in the LCP if a digital input is set
to
[86] Flow Confirmation
(see
parameter
group 5-1* Digital Inputs
).
When the time in this parameter passes, the
frequency converter checks the signal from the
external device. If the signal is active, the
frequency converter runs normally.
29-52 Signal Lost Verification Time
Enter the length of the delay after which the signal is considered
to be lost. This parameter is ignored if
is set to
[0] Confirmation Only
.
Range:
Function:
1 s
*
[0.01 - 255 s]
29-53 Flow Confirmation Mode
Select the operating mode of the flow monitor function.
Option:
Function:
[0]
*
Confirmation
Only
The flow confirmation function is only
active during the start-up of the pump.
[1]
Monitor and
Stop
The flow confirmation function is active
during and after the pump start-up. The
frequency converter performs a ramp
down to a stop if the input signal is lost.
[2]
Monitor and
Coast
The flow confirmation function is active
during and after the pump start-up. The
frequency converter performs coasting if
the input signal is lost.
Parameter Description
VLT
®
AQUA Drive FC 202
240
Danfoss A/S © 05/2018 All rights reserved.
MG20OB02
3
3
Summary of Contents for VLT AQUA Drive FC 202
Page 2: ......
