
Chapter 4 - SETTING-UP AND COMMISSIONING
4-10
584S Frequency Inverter
Ramps
The
RAMPS
option provides access to a number of ramp related parameters which control acceleration and
deceleration characteristics. Ramp 2 times are only active if
FRAMP
parameter is configured as
2ND RAMP
RATES (
see
RECONFIG I/Ps
parameter in the System menu) and terminal 21 is high. Parameter options
include:
RAMP
UP
TIME 1
This is the time taken for the drive to ramp the frequency from 0Hz to
LIMIT
FREQUENCY
.
Range:
0.1 to 3000 seconds.
Default:
10.0 seconds (up to 75kW) - 50.0 seconds (greater than
75kW).
RAMP
DOWN
TIME 1
This is the time taken for the drive to ramp the frequency from
LIMIT
FREQUENCY
to 0Hz.
Range:
0.1 to 3000 seconds.
Default:
10.0 seconds (up to 75kW) - 50.0 seconds (greater than
75kW).
RAMP
UP
TIME 2
This is the time taken for the drive to ramp the frequency from 0Hz to
LIMIT
FREQUENCY
.
Range:
0.1 to 3000 seconds.
Default:
10.0 seconds (up to 75kW) - 50.0 seconds (greater than
75kW).
RAMP
DOWN
TIME 2
This is the time taken for the drive to ramp the frequency from
LIMIT
FREQUENCY
to 0Hz.
Range:
0.1 to 3000 seconds.
Default:
10.0 seconds(up to 75kW) - 50.0 seconds (greater than
75kW).
RAMP
HOLD
This can prevent the drive from tripping on overvolts when decelerating large
inertia loads without a dynamic braking unit. The deceleration ramp is stopped
when the DC link volts rises above the braking level. It is only restarted when
the link voltage falls below this threshold level. The effect is to increase the
overall deceleration time.
Range:
DISABLED
or
ENABLED
Default:
DISABLED
NOTE: Do not enable the ramp hold feature when using injection braking. This will increase the risk
of overvolt tripping on stopping.
RAMP
TYPE
This option allows the user to choose between three types of ramp
characteristics:
LINEAR RAMP
provides a linear increase in motor speed with
time.
PARABOLIC RAMP
provides a soft start characteristic.
S RAMP
provides both soft start at the beginning and
soft finish at the end.
Default:
LINEAR RAMP
.
S
RAMP
%
This dictates the degree of soft start and soft finish experienced when using the
PARABOLIC RAMP
or
S RAMP
.
S RAMP %
has no effect when using
LINEAR RAMP
. An
S RAMP %
value of 0% causes the
PARABOLIC RAMP
or
S RAMP
to act as a
LINEAR RAMP
.
Range:
0 to 100%.
Default:
100%.
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