Fire Mode Log; Main Menu - Fc Closed Loop - Group; Feedback; Pi Basic Settings - Danfoss VLT HVAC Basic Drive Programming Manual

Parameters

3.13 Main Menu - Data Readouts 2 - Group 18

Parameters in this group are array parameters, where up to
10 fault logs can be viewed. [0] is the most recent logged
data, and [9] the oldest. Error codes, values, and time stamp
can be viewed for all logged data

3.13.1 18-1* Fire Mode Log

18-10 FireMode Log:Event
Range: Function:
0 [0.0 - 255 ] View Firemode event.
*

3.14 Main Menu - FC Closed Loop - Group 20

This parameter group is used for configuring the closed loop
PI Controller, that controls the output frequency of the
frequency converter.

3.14.1 20-0* Feedback

This parameter group is used to configure the feedback
signal for the frequency converter's closed loop PI Controller.
20-00 Feedback 1 Source
Option: Function:
This parameter defines which input will be
used as the source of the feedback signal.
[0] No function
*
[1] Analog input 53
[2] Analog input 54
[100] Bus feedback 1
20-01 Feedback 1 Conversion
Option: Function:
This parameter allows a conversion function to
be applied to Feedback 1.
[0] Linear Linear [0] has no effect on the feedback.
*
[1] Square Square root [1] is commonly used when a
root pressure sensor is used to provide flow feedback
flow ∝ pressure )).
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VLT HVAC Basic Drive Programming Guide

3.14.2 20-8* PI Basic Settings

Parameters for configuring the Process PI control.
20-81 PI Normal/ Inverse Control
Option:
[0]
[1]
20-83 PI Start Speed [Hz]
Range:
0.0 Hz
20-84 On Reference Bandwidth
Range:
5.0 %
®
MG.18.B1.02 - VLT is a registered Danfoss trademark
Function:
Normal Normal [0] causes the frequency converter's output
*
frequency to decrease when the feedback is greater
than the setpoint reference. This is common for
pressure-controlled supply fan and pump
applications.
Inverse Inverse [1] causes the frequency converter's output
frequency to increase when the feedback is greater
than the setpoint reference. This is common for
temperature-controlled cooling applications, such as
cooling towers.
Function:
[0.0 - Enter the motor speed to be attained as a
*
200.0 Hz] start signal for commencement of PI control.
Upon power up, the frequency converter
operates using speed open loop control.
When the Process PI start speed is reached,
the frequency converter will change to PI
control.
Function:
[0.0 - 200.0 Enter the On Reference bandwidth. When
*
%] the PI Control Error (the difference between
the reference and the feedback) is greater
than the value of this parameter, then the On
Reference status bit is set high, i.e. =1.
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