LEESON SM-Plus Series Sub-Micro Inverters - Manual (Page 58)

P63 MAX FEEDBACK
This parameter should be set to the value of the process variable that corresponds to the maximum
transducer feedback signal (10 VDC or 20 mA). See the example below:
Example: A 0-100 psi transducer outputs 4 mA at 0 psi and 20 mA at 100 psi. Set MIN FEEDBACK
to 0, and set MAX FEEDBACK to 100. The setpoint will then be adjustable between 0 and 100.
NOTE: If a reverse acting feedback device is being used, MIN FEEDBACK should be set to the
maximum process variable value, and MAX FEEDBACK should be set to the minimum process variable
value.
P64 PROPORTIONAL GAIN
The Proportional Gain setting represents the speed command output (in % of maximum speed) that
results from each 1% of error.
P65 INTEGRAL GAIN
The Integral Gain setting represents the ramp rate of the speed command output (in % of maximum
speed per second) that results from each 1% of error.
P66 PI ACCEL/DECEL
When the PI unit attempts to respond to a sudden step change in setpoint, the result can be unstable
operation. This parameter acts like a “filter’ and ramps the setpoint from the old value to the new value
over a programmable period of time to smooth the PI unit’s response. If PI ACCEL/DECEL is set to 0.0
seconds, it is effectively disabled.
P67 MIN ALARM
This parameter represents the process value that the feedback signal must fall below to activate the MIN
ALARM output (see Parameters 6 and 13).
P68 MAX ALARM
This parameter represents the process value that the feedback signal must exceed to activate the MAX
ALARM output (see Parameters 6 and 13).
NOTE: The MIN ALARM function can be used to start and stop the drive based on the level of the PI
feedback signal. This is done by wiring a 2-wire start/stop circuit through the drive’s open-collector
output, and setting the open-collector output for MIN ALARM (see Parameters 6 and13). When the
signal drops below the MIN ALARM setting, the open-collector output will de-energize, which will stop
the drive. When the signal is equal to or greater than the MIN ALARM setting, the open-collector
output will energize and start the drive.
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