Parameters 30-** Special Features; Parameters 31-** Bypass Option - Danfoss VLT AQUA Drive FC 202 Programming Manual

Parameter Description
3.24.5 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
3 3 monitor expects to get 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 a user
defines how long theVLT
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.
N
MAX
1
N
MIN
0
2
1
0
3
1
4 0
1
0
1 Speed curv.
2 Start command (e.g. terminal 18)
3 Digital signal from an external device that confirms that
the flow is possible.
4 Flow verification
t Start command issued (e.g. terminal 18 is set active)
0
t Digital signal from an external device gets active before
1
parameter 29-50 Validation Time expires.
t When parameter 29-51 Verification Time passes, the
2
frequency converter checks the signal from the external
device again and then runs normally.
Illustration 3.92 Flow Confirmation
194
Programming Guide
®
AQUA Drive FC 202 waits for
T
T
T
T
t0 <t1 t2
Danfoss A/S © Rev. 2014-01-21 All rights reserved.
29-50 Validation Time
Range: Function:
NOTICE
Size [ 0 -
related 999 s]
*
Parameter 29-50 Validation Time is
only visible in the LCP if a digital
input is set to [86] Flow Confirmation
(see parameter group
chapter 3.7.2 5-1* Digital Inputs).
The digital input from an external device
must be active during the validation time.
29-51 Verification Time
Range: Function:
NOTICE
15 s [ 0.10 -
*
255 s]
Parameter 29-51 Verification Time is only
visible in the LCP if a digital input is set
to [86] Flow Confirmation (see parameter
group chapter 3.7.2 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.

3.25 Parameters 30-** Special Features

3.25.1 30-8* Compatibility
30-81 Brake Resistor (ohm)
Range: Function:
Set the brake resistor value in Ω
Size [ 5 - 65535.00
related Ohm]
with 2 decimals. This value is used
*
for monitoring the power to the
brake resistor in 2-13 Brake Power
Monitoring.

3.26 Parameters 31-** Bypass Option

Parameter group for the configuration of the electronically
controlled bypass option board, MCO 104.
31-00 Bypass Mode
Option: Function:
[0] Drive Select the operating mode of the bypass:
[0] Drive: the motor is operated by the frequency
converter.
[1] Bypass Select the operating mode of the bypass:
[1] Bypass: motor can be run at full speed in bypass
mode.
MG20O702