Danfoss VLT AQUA Instruction Manual page 142

5 How to program the adjustable frequency
drive
[74] m WG
[75] mm Hg
[80] kW
[120] GPM
[121] gal/s
[122] gal/min
[123] gal/h
[124] CFM
[125]
ft 3 /s
[126] ft 3 /min
[127] 3
ft /h
[130] lb/s
5
[131] lb/min
[132] lb/h
[140] ft/s
[141] ft/min
[145] ft
[160] °F
[170] psi
[171] 2
lb/in
[172] in WG
[173] ft WG
[174] in Hg
[180] HP
20-21 Setpoint 1
Range:
0.000 Proc- [-999999.999 - 999999.999 Proc-
essCtrlU- essCtrlUnit]
nit*
20-81 PID Normal/Inverse Control
Option:
[0] * Normal
[1] Inverse
5-36
This parameter determines the unit that is used for the setpoint reference and feedback that the
PID controller will use for controlling the output frequency of the adjustable frequency drive.
Function:
Setpoint 1 is used in closed-loop mode to enter a setpoint reference that is used by the adjustable
frequency drive's PID controller. See the description of par. 20-20
NOTE!
Setpoint reference entered here is added to any other references that are enabled
(see par. group 3-1*).
Function:
Normal [0] causes the adjustable frequency drive'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
[1] causes the adjustable frequency drive's output frequency to increase when the feedback
is greater than the setpoint reference.
®
MG.20.P3.22 - VLT is a registered Danfoss trademark
VLT AQUA High Power Instruction Manual
Feedback Function
.