VLT
®
Series 3500
73
★ = ROM default setting. ✔ = Normal Danfoss setup. Text in ( ) = display text. Figures in [ ] are used when communicating with the bus.
306 DC Braking Time (DC-BRAKE T)
Value:
0000.0 to 3600.0 sec. ★ 0000.0 sec.
307 DC Brake Cut-in Frequency (DC-BRK ON)
Value:
000.0 to 120.0 Hz ★ 1.0 Hz.
308 DC Brake Voltage (DC-BRK VOL)
Value:
0 to 50 V ★ Depends on unit
Function:
If the stator of an asynchronous motor is supplied with a DC
current, a braking torque will result. The amount of braking
torque depends upon the DC braking voltage set by param-
eter 308.
Description of choice:
Select the duration of the energized DC voltage in param-
eter 306. Select the output frequency at which DC braking
is to start on ramp-down in parameter 307. Select the
amount of DC braking voltage in parameter 308. Param-
eters 306 and 307 must be different from 0 to activate the
DC braking. DC braking can also be activated through ter-
minal 27, parameter 404. There is usually no requirement
for braking in HVAC applications.
WARNING
!
If the DC brake voltage value is too high or if it is applied for
too long, the motor will be damaged by overheating. If DC
braking is used, start with low voltage values and a short
time duration.
309 Reset Function (RESET MODE)
Value:
★ Manual reset (MANUAL) [0]
Automatic reset (AUTOMATIC X 1) [1]
Automatic reset (AUTOMATIC X 2) [2]
Automatic reset (AUTOMATIC X 3) [3]
Automatic reset (AUTOMATIC X 4) [4]
Automatic reset (AUTOMATIC X 5) [5]
Automatic reset (AUTOMATIC X 6) [6]
Automatic reset (AUTOMATIC X 7) [7]
Automatic reset (AUTOMATIC X 8) [8]
Automatic reset (AUTOMATIC X 9) [9]
✔ Automatic reset (AUTOMATIC X 10) [10]
Start disabled (START INHIBIT) [11]
Function:
The VLT 3500 Series can be programmed for automatic
fault reset. From one to ten automatic reset attempts may
be selected by this parameter. The time delay between re-
set attempts may be from one to ten seconds. The time de-
lay is chosen by parameter 312.
Description of choice:
Manual reset
[0] can be accomplished through the serial
bus, terminal 16, or from the operating panel.
Automatic reset
[1-10]: The number of resets, between 1
and 10, can be selected. If resetting fails, it is because the
drive is in TRIP LOCK mode, which can only be reset by re-
moving and reapplying the AC power.
Start not possible
[11] disables manual or automatic reset
after a fault trip. This setting is available only in connection
with serial communication, because restart is only possible
from the serial bus.
DANGER
!
When auto restart is permitted, the motor may start without
warning.
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