Danfoss VLT AQUA Drive FC 202 Programming Guide

3.25.5 29-5* Flow Conrmation
The ow conrmation feature is designed for applications
where there is a need for the motor/pump to run while
waiting for an external event. The ow conrmation
monitor expects to receive a digital input from a sensor on
a gate valve, ow switch, or a similar external device,
indicating that the device is in the open position and ow
is possible. In parameter 29-50 Validation Time, dene for
how long the VLT
®
AQUA Drive FC 202 waits for the digital
input signal from the external device to conrm the ow.
After the ow is conrmed, the frequency converter checks
the signal again after the ow verication time and then
runs normally. The LCP status reads Verifying ow while the
ow monitor is active.
The frequency converter trips with the alarm Flow Not
Conrmed if the expected digital input signal becomes
inactive before either the ow validation time or the ow
verication 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 conrms that
the ow is possible.
4 Flow verication.
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 Verication Time passes, the
frequency converter checks the signal from the external
device again and then runs normally.
Illustration 3.115 Flow Conrmation
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 Conrmation
(see parameter group 5-1* Digital
Inputs).
The digital input from an external device
must be active during the validation time.
29-51 Verication Time
Range: Function:
15 s* [ 0.10 -
255 s]
NOTICE
Parameter 29-51 Verication Time is only
visible in the LCP if a digital input is set
to [86] Flow Conrmation (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 Verication Time
Enter the length of the delay after which the signal is considered
to be lost. This parameter is ignored if parameter 29-53 Flow
Conrmation Mode is set to [0] Conrmation Only.
Range: Function:
1 s* [0.01 - 255 s]
29-53 Flow Conrmation Mode
Select the operating mode of the ow monitor function.
Option: Function:
[0] * Conrmation
Only
The ow conrmation function is only
active during the start-up of the pump.
[1] Monitor and
Stop
The ow conrmation 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 ow conrmation 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
33

Danfoss VLT AQUA Drive FC 202 Specifications

General

Brand	Danfoss
Model	VLT AQUA Drive FC 202
Category	DC Drives
Language	English