Danfoss VLT Manuale - Pagina 2
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Programming No-Flow detection
Programming for No-Flow detection
is simplified with a number of para-
meters that are pre-programmed into
Par.#
Description
22-20
Low Power Auto Set-up
The following parameters are accessed through the Main Menu and will be stored after pressing the [OK] key to save the results after the auto-tuning
22-33
Low Speed
[Hz]
22-34
Low Speed Power [kW]
22-37
High Speed
[Hz]
22-3
High Speed Power [kW]
These parameters are used after Auto Set-up and the No-Flow feature is operating
22 - 30
No-Flow Power
22 - 31
Power Correction
Factor
The following parameters determine the action that the drive will take if a no flow condition is detected
22-21
Low Power
Detection
22-23
No-Flow Function
22-24
No-Flow Delay
The following parameters give and indication to a BMS if a no flow condition is detected
5-40
Function Relay
Digital Output
The following are used if No-Flow is reported via serial communications
Protocol
BACnet
LonWorks
TU
Modbus RTU
Danfoss Drives, Ulsnaes 1, DK-6300 Graasten, Denmark, Tel. +45 74 88 22 22, Fax +45 74 65 25 80, www.danfoss.com/drives • E-mail: [email protected]
MF004A02
the drive. Prior to programming this
feature, commission the drive by
using the parameters in the Quick
Settings
Factory
Recommended
setting
setting
Disable
Enable
100%
110%
Disable
Enable
Off
Sleep Mode/
Warning/Alarm
10 sec.
[190] No-Flow
[190] No-Flow
VLT® is a trademark of Danfoss A/S
Comments
Close the outlet valve for the pump before starting Auto Set-up. Select Enable
and follow the instruction on the LCP. After Auto Set-up is complete, open the
pump outlet valve.
When Low Power Auto Set-up is used, 50% of the drive's maximum frequency
will be stored here. This can be manually edited, if desired.
When Low Power Auto Set-up is used, the output power measured under
no-flow conditions at 50% speed will be stored here. This can be manually
edited, if desired.
When Low Power Auto Set-up is used, 85% of the drive's maximum frequency
will be stored here. This can be manually edited, if desired.
When Low Power Auto Set-up is used, the output power measured under
no-flow conditions at 85% speed will be stored here. This can be manually
edited, if desired.
When the drive is running, this parameter will show the power level that will
be interpreted as producing no flow at the current motor speed.
This parameter is used to raise or lower the no-flow power curve to the
percentage entered here. Values above 100% help ensure the drive reliably
detects no-flow.
To activate no-flow based on power
Select action
Set the time delay before the drive will perform the No-Flow Function.
Generally set longer than the decel ramp time.
Program one of the relays to selection [190], No-Flow. The selected relay will
be activated when No-Flow occurs.
A digital output can be used to indicate a no flow condition. Use the
parameter that sets the function of the desired digital output.
Warning Word
BV:77 No Flow
nvoWarningword Bit 37
Register 16930 Bit 6 = 1
Menu Q2 Quick Set-Up. Then perform
the following steps for programming
No-Flow detection:
Produced by KKM 2007.10