Flow Confirmation Overview - Danfoss VLT AQUA Drive FC 202 Design Manual

Product Features
Parameter and Description
Name
Parameter 29-4 Select the pre/post
0 Pre/Post Lube lube function. Use
Function parameter 1-71 Start
Delay to set the
delay before the
motor starts ramping.
Parameter 29-4 Enter the duration of
1 Pre Lube Time the signal after the
start signal. Used
only when [1] Pre
lube Only is selected
in
parameter 29-40 Pre/
Post Lube Function.
Parameter 29-4 Select the duration of
2 Post Lube the signal after the
Time motor has stopped.
Used only when [3]
Pre & running & post
is selected in
parameter 29-40 Pre/
Post Lube Function.
Table 5.1 Pre/Post Lube Parameters

5.8 Flow Confirmation Overview

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 drive 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.
If the expected digital input signal becomes inactive before
either the flow validation time or the flow verification time
expires, the drive trips with the alarm alarm 92, No flow.
MG22B222
Design Guide
Settings Unit
[0]*Disabled –
[1] Pre lube only
[2] Pre & running
[3] Pre & running
& post
0–600 (*10) s
0–600 (*10) s
Danfoss A/S © 01/2018 All rights reserved.
N
MAX
1
N
MIN
0
2
1
0
3
1
4 0
1
0
t0
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 Start command issued (for example, terminal 18 is set
0
active).
t Digital signal from an external device becomes active
1
before parameter 29-50 Validation Time expires.
t When parameter 29-51 Verification Time passes, the drive
2
checks the signal from the external device again and
then runs normally.
Figure 5.14 Flow Confirmation
Parameter and Description
name
Parameter 29-5 The digital input
0 Validation must be active
Time
during the
validation time.
Parameter 29-5 Flow will be
1 Verification confirmed if, at the
Time end of the verifi-
cation time, the
digital input is still
active.
Table 5.2 Flow Confirmation Parameters
NOTICE!
The parameters are only visible on the LCP when a
digital input is configured as flow confirmation.
T
T
T
T
<t1 t2
Settings Unit
0.1–999.0 s
(*size dependent)
0.1–255.0 s
(*15)
31
5 5