Danfoss VLT 3006 Product Manual page 97

Parameter description
215
Ramp-up time
(Ramp up time)
216
Ramp-down time
(Ramp down time)
217
Alternative
ramp-up time
(ALT. up ramp)
218
Alternative
ramp-down time
(ALT. down ramp)
219
Frequency bypass 1
(Freq 1 bypass)
220
Frequency bypass 2
(Freq 2 bypass)
221
Frequency bypass 3
(Freq 3 bypass)
222
Frequency bypass 4
(Freq 4 bypass)
223
Frequency bypass
band width
(Bypass B. width)
224
Carrier frequency
(Carrier freq.)
225 (version 3.0)
Output frequency-
dependent switch
frequency
(output.sw.freq.)
96
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Value:
0.00 - 3600 sec.
Value:
0.00 - 3600 sec.
Value:
0.00 - 3600 sec.
Value:
0.00 - 3600 sec.
Value:
0 - f
RANGE
Value:
0 - f
RANGE
Value:
0 - f
RANGE
Value:
0 - f
RANGE
Value:
0 - 100%
Value:
2.0 - 14.0 kHz
Value:
DISABLE
ENABLE
= Factory setting. Text in ( ) = Display text.
The figures in [ ] are used in bus communication.
®
MG.30.A7.02 - VLT is a registered Danfoss trademark
The ramp-up time t
time from 0 Hz to the rated motor fre-
Depending
on unit quency, provided that the output current
is not higher than the current limit (para-
meter 209).
The ramp-down time t
Depending time from rated motor frequency to 0 Hz,
on unit
provided that there is no excess voltage in
the inverter due to regenerative operation
of the motor. The requirement of rapid
braking can make it necessary to install a
brake option.
The alternative ramp time is activated
Depending
using start on jog speed via terminal 29,
on unit
parameter 405.
A start signal must not have been given
(e.g. terminal 18, parameter 402).
The alternative ramp time is activated using
quick stop via terminal 27, parameter 404
or via serial bus (RS485).
Depending
on unit
Some systems require that certain output
frequencies are avoided due to resonance
f
RANGE
problems in the installation.
Record the frequencies to be avoided and
record the bandwidth as a percentage of
the recorded frequencies. The bypass
f
RANGE
band is the bypass frequency +/- the set
bandwidth.
f
RANGE
f
RANGE
0
The set value determines the carrier fre-
quency. Changing the switching frequency
4.5 kHz
will minimise any acoustic noise from the
motor. VLT
types may not operate at a higher switching
frequency than 4.5 kHz.
Note: Switching frequencies higher than
4.5 kHz give certain deratings, see p. 131.
The switching frequency depends on the
output frequency. The switching frequency
[0]
can either be fixed at "DISABLE" or
[1]
decreasing with increasing output frequency
"ENABLE". Maximum switch frequency is,
however, determined by parameter 224.
2.. References and limits
is the acceleration
a
is the deceleration
−A
® 3060-3250 and certain old