X4 AC Drive User’s Manual
Chapter 7: X4 Parameters
1428D-0607
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© 2007 TB Wood’s All Rights Reserved
309 Cut-Off Freq
Default: 0.0 Hz
Range: 0.0 to 5.0 Hz
Level 2
This parameter sets the point where the drive no longer attempts to spin the motor. The range of this parameter is 0.0-
5.0 Hz. When the parameter is configured to a value of 0.0 Hz, the drive will operate with no Cut-off Frequency. If the
function is enabled, the drive will be able to ramp up through the cut-off frequency range, as in normal operation. If the
speed command falls below the cut-off frequency, the drive stops “gating” the outputs and coasts down to zero speed.
The keypad display will indicate Zero Speed, and the Forward or Reverse LED will be lit depending on the command.
When the reference returns to a value greater than the cut-off frequency, the drive will ramp from 0.0 Hz to the reference
frequency.
401 Ramp Select
Default: ART DI
Range: n/a
Level: 2
The Ramp Select parameter configures when the alternate ramps of the drive will be active and whether the drive
ramps to stop, or coasts to stop. The following data values may be assigned to this parameter:
Parameter Value
Type of Ramp
Ramp Configured by:
ART-DI
Ramp-to-Stop
402 (Accel Time 1) and 403 (Decel Time 1)
ART-F/R
Ramp-to-Stop
Running forward: 402 (Accel Time 1) and 403 (Decel Time 1)
Running reverse: 404 (Accel Time 2) and 405 (Decel Tiime 2)
ART-Frq
Ramp-to-Stop
If the output frequency is less than preset frequency parameter 308 (Preset Freq
6), the active ramp is set by 402 Accel Time 1 and 403 Decel Time 1. If the
output frequency is equal to or greater than 308 (Preset Freq 6), the active ramp
is set by 404 (Accel Time 2) and 405 (Decel Time 2).
ART-Strt/RS
Ramp-to-Stop
This setting uses the Alternate Ramp for Acceleration (parameter 404) to the set
speed, then uses the Main ramps (parameters 402 and 403) when the speeds
are adjusted. The drive will revert to the Alternate Decel ramp (parameter 405)
when a Stop command is given.
S-Curve
Ramp-to-Stop
The drive uses 402 (Accel Time 1) and 403 (Decel Time 1) for total time and
414 as the S Ramp Rounding value. The amount of rounding is the same for that
start and stop of the ramp time.
ART-DI CTS
Coast-to-Stop
Same as ART-DI but with Coast-to-Stop
ART-F/R CTS
Coast-to-Stop
Same as ART-F/R but with Coast-to-Stop
ART-Frq CTS
Coast-to-Stop
Same as ART-Frq but with Coast-to-Stop
ART-Str/CS
Coast-to-Stop
Same as ART-Strt but with Coast-to-Stop
S-Curve CTS
Coast-to-Stop
Same as S-Curve but with Coast-to-Stop
402 Accel Time 1
Default: 5.0 s
Range: 0.1 to 3200.0 s
Levels 1,2
This parameter configures the default length of time to accelerate from 0 Hz to the value of parameter 302 (Max
Frequency). This acceleration ramp is selected by parameter 401 (Ramp Select).
Note that extremely short acceleration times may result in nuisance fault trips.
403 Decel Time 1
Default: 5.0 s
Range: 0.1 to 3200.0 s
Levels 1,2
This parameter configures the default length of time to decelerate from the value of parameter 302 (Max Frequency)
to 0 Hz. The deceleration ramp is selected by Parameter 401 (Ramp Select).
Note that extremely short deceleration times may result in nuisance fault trips or may require an external dynamic brake
or regen current limit.
404 Accel Time 2
Default: 3.0 s
Range: 0.1 to 3200.0 s
Level 2
This parameter provides an alternate ramping time for the drive when accelerating, configuring the length of time to
accelerate from 0 Hz to the value of parameter 302 (Max Frequency). This acceleration ramp is selected by parameter
401 (Ramp Select) or Sequencer Configuration.
Note that extremely short acceleration times may result in nuisance fault trips.
Table 7-2: Description of X4 Parameters (Page 7 of 26)