Danfoss VLT HVAC Series Programming Manual page 55

VLT ® HVAC Drive Programming Guide
2-03 DC Brake Cut-in Speed [RPM]
Range:
0 RPM* [0 - par. 4-13 RPM]
3.4.2 2-1* Brake Energy Funct.
Parameter group for selecting dynamic braking parameters.
2-10 Brake Function
Option:
[0] * Off
[1] Resistor brake
[2] AC brake
2-11 Brake Resistor (ohm)
Range:
50. Ohm* [5. - 32000. Ohm]
2-12 Brake Power Limit (kW)
Range:
5.000 kW* [0.001 - 500.000 kW]
For 200–240 V units:
For 380–480 V units
For 380–500 V units
For 575–600 V units
This parameter is only active in adjustable frequency drives with an integral dynamic brake.
Function:
Set the DC brake cut-in speed for activation of the DC braking current set in par.2-01
Current , upon a stop command.
Function:
No brake resistor installed.
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.
Function:
Set the brake resistor value in Ohms. This value is used for monitoring the power to the brake
Brake Power Monitoring
resistor in par.2-13
drives with an integral dynamic brake.
If the selection is xxxx use this parameter. If the selection is xxx.xx, use par. 3-81
Time .
Function:
Set the monitoring limit of the braking energy 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.
390 2 ×
dutytime
P resistor
=
R
× 120
778 2 ×
dutytime
P resistor
=
R
× 120
810 2 ×
dutytime
P resistor
=
R × 120
943 2 ×
dutytime
P resistor =
R × 120
MG.11.C6.22 - VLT ® is a registered Danfoss trademark
3 Parameter Description
. This parameter is only active in adjustable frequency
DC Brake
3
Quick Stop Ramp
3-31