VLT
®
Series 3500
70
★
= ROM default setting.
✔
= Normal Danfoss setup. Text in ( ) = display text. Figures in [ ] are used when communicating with the bus.
217 Alternative Accel (ramp up) Time (ALT. UP RA)
Value:
0000.00 to 3600.00 sec.
★
depends on unit
✔
60 sec fan
✔
10 sec pump
Function:
This alternative ramp time is activated when the jog func-
tion is activated through terminal 29 (parameter 405) or the
serial communication. No start signal needs to be given.
Description of choice:
The desired alternative accel time is programmed. This
generally should be set to the same value as parameter
215. While parameter 215 can also be accessed through
the Quick Set Up Menu, parameter 217 can only be ac-
cessed through the Extended Menu.
218 Alternative Decel (ramp down) Time (ALT. DOWN)
Value:
0000.00 - 3600.00 sec.
★
depends on unit
✔
60 sec fan
✔
10 sec pump
Function:
This alternative decel time is activated when a quick-stop is
selected from terminal 27, parameter 404 or serial bus.
Description of choice:
The desired alternative decel time is programmed. This gen-
erally should be set to the same value as parameter 216.
While parameter 216 can also be accessed through the
Quick Set Up Menu, parameter 218 can only be accessed
through the Extended Menu.
219 Frequency Bypass 1 (FREQ 1 BYP)
Value:
0 to 120 Hz
★
120 Hz
220 Frequency Bypass 2 (FREQ 2 BYP)
Value:
0 to 120 Hz
★
120 Hz
221 Frequency Bypass 3 (FREQ 3 BYP)
Value:
0 to 120 Hz
★
120 Hz
222 Frequency Bypass 4 (FREQ 4 BYP)
Value:
0 to 120 Hz
★
120 Hz
223 Frequency Bypass Bandwidth (BYPASS B.W)
Value:
0 to 100%
★
0 %
Function: (Parameter 219 to 223)
Some systems must avoid certain output frequencies due
to resonance in the driven equipment. Parameters 219
through 222 each allow a range of output frequencies to be
bypassed. Parameter 223 sets the bandwidth of the fre-
quency set in parameters 219 through 222 to be avoided.
This is set as a percent of the bypass frequency.
Description of choice: (Parameter 219 to 223)
Enter the frequencies to be avoided in parameters 219
through 222. Enter one bandwidth percentage to be
avoided in parameter 223. The actual avoidance range will
be the bandwidth percentage for each avoidance fre-
quency; half below the set frequency, and half above the
set frequency.
224 Carrier Frequency (CARRIER FR)
Value:
2.0 to 14.0 kHz
★
4.5 kHz
✔
14.0 kHz*
Function:
The set value determines the carrier frequency of the in-
verter. Changing the carrier frequency may minimize acous-
tic noise from the motor. *VLT Types 3575 - 3800 and 208/
230 volt VLT 3542 - 3562 cannot be set above 4.5 kHz.
Description of choice:
The carrier frequency may be adjusted while the motor is
running to find the carrier frequency at which motor noise is
the lowest.
NOTE:
Switching frequencies higher than 4.5 kHz lead to
automatic derating unless Adjustable Switching
Frequency Modulation (ASFM), parameter 225 is
enabled.
