Danfoss VLT Programming Guide

NB!
The maximum value depends on the rated motor current. Avoid 100 % current for too long. It may damage the motor.
2-02 DC Braking Time
Range: Function:
10.0 s* [0.0 - 60.0 s] Set the duration of the DC braking current set in par. 2-01 DC Brake Current , once activated.
2-03 DC Brake Cut In Speed [RPM]
Range: Function:
Application
dependent*
[Application dependant] Set the DC brake cut-in speed for activation of the DC braking current set in par. 2-01 DC Brake
Current
, upon a stop command.
2-04 DC Brake Cut In Speed [Hz]
Range: Function:
Application
dependent*
[Application dependant] This parameter is for setting the DC brake cut in speed at which the DC braking current (par. 2-01)
is to be active, in connection with a stop command.
3.4.2 2-1* Brake Energy Funct.
Parameter group for selecting dynamic braking parameters. Only valid for drives with brake chopper.
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 brake energy as heat. Connect-
ing a brake resistor allows a higher DC link voltage during braking (generating operation). The
Resistor brake function is only active in frequency converters with an integral dynamic brake.
[2] AC brake AC Brake will only work in Compressor Torque mode in par. 1-03
Torque Characteristics .
2-11 Brake Resistor (ohm)
Range: Function:
Application
dependent*
[Application dependant] Set the brake resistor value in Ohms. This value is used for monitoring the power to the brake
resistor in par. 2-13
Brake Power Monitoring . This parameter is only active in frequency converters
with an integral dynamic brake.
Use this parameter for values without decimals. For a selection with two decimals, use
par. 30-81
Brake Resistor (ohm) .
2-12 Brake Power Limit (kW)
Range: Function:
Application
dependent*
[Application dependant] Set the monitoring limit of the brake power transmitted to the resistor.
The monitoring limit is a product of the maximum duty cycle (120 sec.) and the maximum power
of the brake resistor at that duty cycle. See the formula below.
For 200 - 240 V units:
P
resistor
=
390
2
× dutytime
R
× 120
For 380 - 480 V units
P
resistor
=
778
2
× dutytime
R
× 120
For 380 - 500 V units
P
resistor
=
810
2
× dutytime
R
× 120
For 575 - 600 V units
P
resistor
=
943
2
× dutytime
R
× 120
3 Parameter Description VLT
®
HVAC Drive Programming Guide
60 MG.11.C9.02 - VLT
®
is a registered Danfoss trademark
3

Danfoss VLT Specifications

General

Frequency	50/60 Hz
Enclosure	IP20, IP21, IP55, IP66
Series	VLT
Control Technique	Flux Vector Control
Output Voltage	0-Vinput
Control Method	Fieldbus
Communication Interface	PROFIBUS, CANopen
Protection Features	Overload, Overvoltage, Undervoltage, Short Circuit, Ground Fault
Cooling Method	Liquid Cooled
Storage Temperature	-25°C to +70°C
Relative Humidity	5-95% non-condensing
Altitude	Up to 1000m (3280ft) without derating, up to 4000m (13120ft) with derating
Operating Temperature	-10°C to +50°C (14°F to 122°F)