95
6 - PARAMETER DESCRIPTION
P27 Preset Slow Speed CFN 21
LED Display LCD Display
Range Off, 7.1%, 14.3 % (Default Off)
Description The Preset Slow Speed parameter sets the speed of motor operation. When set to "Off", slow speed operation
is disabled.
Slow speed operation is commanded by programming one of the digital inputs to either "Slow Speed
Forward" or "Slow Speed Reverse". Energizing the Slow Speed Input when the starter is in idle will initiate
slow speed operation.
z NOTE: When the motor is operating at slow speeds its cooling capacity can be greatly reduced. Therefore,
the running time of the motor at a given current level is dependant on the motor’s thermal capacity. Although
the Motor OL is active (if not set to "Off") during slow speed operation, it is recommended that the motor
temperature be monitored when slow speed is used for long periods of time.
See Also Slow Speed Current Level (P27 / CFN 22) parameter on page 95.
Slow Speed Time Limit (P29 / CFN 23) parameter on page 96.
Digital Input Configuration (P48-P50 / I/O 01-03) parameters on page 110.
Relay Output Configuration (P52-54 / I/O 05-07) parameters on page 112.
Theory of Operation section 7.6.2, Slow Speed Operation on page 157.
z NOTE: Remote Source (P5 / QST 05) must be set to 'Terminal'.
z NOTE: For Continuous Slow Speed Operation, an RC2 is required.
P28 Preset Slow Speed Current Level CFN 22
LED Display LCD Display
Range 10 – 400 % FLA (Default 100%)
Description The Preset Slow Speed Current Level parameter selects the level of current applied to the motor during slow
speed operation. The parameter is set as a percentage of motor full load amps (FLA). This value should be
set to the lowest possible current level that will properly operate the motor.
See Also Motor Running Overload Class (P3 / QST 03) parameter on page76.
Slow Speed Time Limit (P29 / CFN 23) parameter on page 96.
Theory of Operation section 7.6.2, Slow Speed Operation on page 157.
CFN: SSpd Curr
22 100 %
CFN: SSpd Speed
21 Off
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