VLT
®
Series 3500
72
★
= ROM default setting.
✔
= Normal Danfoss setup. Text in ( ) = display text. Figures in [ ] are used when communicating with the bus.
Group 3 -- Functions and Timers
301 Start Frequency (START FREQ)
Value:
00.0 to 10 Hz
★
0.0 Hz
Function:
It is possible to define an output frequency at which the mo-
tor is to start. This will be the initial operation speed when
Start is pressed. The accel ramp will not be used to reach
this frequency. Start frequency is separate from minimum
speed.
Description of choice:
Program the initial frequency for the motor to run at when
given a start command.
302 Delayed Start (START DELA)
Value:
0.0 to 1.0 sec.
★
0.0 sec.
Function:
VLT 3500 Series starts at the start frequency (parameter
301) and begins to ramp up when the start delay has
ended.
Description of choice:
Program the desired time delay before VLT 3500 Series
starts to ramp up.
303 High Starting Torque (HI START T)
Value:
0.0 to 1.0 sec.
★
0.0 sec.
Function:
High starting torque allows a current approximately two
times the current limit of parameter 209 for the specified
time after a start command is given.
Description of choice:
Insert the time required to give 200% starting current.
304 AC Line (POWER FAIL)
Value:
★
Uncontrolled stop (NORM PWR DWN)
[0]
Ramp down 1 (RAMP DOWN)
[1]
Ramp down 2 (ALT. RAMP DWN)
[2]
Function:
Select one of the three ramp-down functions to control the
ramp-down in a power-out situation. The exact ramp-down
will depend upon the speed and load at the time of the
power outage. If the ramp-down time is short, a regenera-
tive effect may keep up the DC voltage which means that it
takes longer before the drive shuts off.
Description of choice:
Uncontrolled stop [0]:
The motor continues to run at the selected speed until the
control voltage drops too low.
Ramp down 1 [1]:
The motor begins to ramp down immediately following the
Decel Time set in parameter 216 (or Quick Set Up Menu
step 9) until the control voltage drops too low.
Ramp down 2 [2]:
The motor begins to ramp down immediately following the
Alternative Decel Time set in parameter 218.
305 Catch a Rotating Motor (FLYING STA)
Value:
★
Disable (NO FLY START)
[0]
✔
OK - same direction (SAME DIRECT)
[1]
OK - both directions (BOTH DIRECT)
[2]
Stop before start (DC-BRAKE @STA)
[3]
Function:
This parameter is used when a stopped drive may be start-
ing into a rotating motor.
Description of choice:
No Fly Start [0]
Select if the motor will not be rotating when a start com-
mand is given. The drive will always attempt to accelerate
the motor from low speed. If the motor is rotating at a sig-
nificant speed, the drive may give an overcurrent trip.
OK - same direction [1]:
Select if motor may be rotating in same direction as drive
direction.
OK - both directions [2]:
Select if motor may rotate in either direction.
Stop before start [3]:
Select if the motor is to be first stopped by DC braking and
then ramped to speed. The DC braking time is set by pa-
rameter 306.
