NOTE!
Digital input should be set to [0]
PNP - Active at 24V
in par. 5-00.
2-00 DC Hold/Preheat Current
Range:
Function:
50 %*
[Application dependant]
Enter a value for holding current as a percentage of the rated motor current I
M,N
set in
. 100% DC holding current corresponds to I
M,N
.
This parameter holds the motor (holding torque) or pre-heats the motor.
This parameter is active if [1] DC hold/Preheat is selected in par. 1-80
NOTE!
The maximum value depends on the rated motor current.
Avoid 100% current for too long. It may damage the motor.
2-10 Brake Function
Option:
Function:
[0] *
Off
No brake resistor installed.
[1]
Resistor brake
Brake resistor incorporated in the system, for dissipation of surplus braking energy as heat. Con-
necting a brake resistor allows a higher DC link voltage during braking (generating operation). The
resistor brake function is only active in adjustable frequency drives with an integral dynamic brake.
[2]
AC brake
AC Brake will only work in Compressor Torque mode in par. 1-03
2-17 Over-voltage Control
Option:
Function:
Over-voltage control (OVC) reduces the risk of the adjustable frequency drive tripping due to over-
voltage on the DC link caused by generative power from the load.
[0]
Disabled
No OVC required.
[2] *
Enabled
Activates OVC.
NOTE!
The ramp time is automatically adjusted to avoid tripping of the adjustable frequency drive.
3-02 Minimum Reference
Range:
Function:
Application
dependent*
[Application dependant]
Enter the Minimum Reference. The Minimum Reference is the lowest value obtainable by adding all
references together. The Minimum Reference value and unit matches the configuration choice made
in par. 1-00
Reference/Feedback Unit
, respectively.
NOTE!
This parameter is used in open-loop only.
VLT HVAC Low Harmonic Drive Instruction
Manual
6 How to Program the Low Harmonic Drive
MG.16.A1.22 - VLT
®
is a registered Danfoss trademark
6-19
6
