57
VLT
®
3500 HVAC
MG.35.B1.02 – VLT is a registered Danfoss trademark
Section 1Section 1Section 1Section 1Section 1
Section 2Section 2Section 2Section 2Section 2
Section 3Section 3Section 3Section 3Section 3
Section 4Section 4Section 4Section 4Section 4
3.7 Parameter gr
oup 3
: Flying start
: Normal start
: Indifferent
When the function Coupling to rotating motor has been selected
Example1:
Example1:
Example1:
Example1:
Example1:
Example 2:
Example 2:
Example 2:
Example 2:
Example 2:
Example 3:
Example 3:
Example 3:
Example 3:
Example 3:
Example 4:
Example 4:
Example 4:
Example 4:
Example 4:
306 DC-braking time (DC-BRAKE TIME)
Value:
0.0 - 3600 secs.
★
0.0 sec.
307 DC-brake cut-in frequency (DC BRK ON FREQ)
Value:
0.0 - 120 Hz
★
1.0 Hz.
308 DC-brake voltage (DC-BRK VOLTAGE)
Value:
0 - 50 V
★
Depends on unit
Function:
If the stator of an asynchronous motor is supplied
with a DC current, a braking torque will arise.
The braking torque depends on the selected DC
brake voltage (par. 308).
Description of choice:
Select the duration of the energized DC voltage (par.
306). Pay attention to the motor power.
Select the output frequency at which DC braking is to
start on ramp-down to stop (par. 307).
If the value is too high, the motor can be
damaged because of overheating.
Parameters 306 and 307 must be different from 0 to
activate the DC braking.
DC braking can also be activated via terminal 27 (pa-
rameter 404).
NB!:
If VLT 3575-3800 and 3542-62 are used, there
is no braking just after the connection to
mains.
★
= factory setting. Text in ( ) = display text. Figures in [ ] are used when communicating with the bus.