SF01U 59
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 value, and MAX FEEDBACK should be set
to the minimum process 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 and 13). 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.
P69 0-10 VDC FEEDBACK
This can be used to monitor the PI feedback when using a 0-10 VDC feedback signal. The displayed
value will be scaled according to the MIN and MAX FEEDBACK parameters (62 and 63).
P70 4-20 mA FEEDBACK
This can be used to monitor the PI feedback when using a 4-20 mA feedback signal. The displayed
value will be scaled according to the MIN and MAX FEEDBACK parameters (62 and 63).
P71 ACTUAL FREQUENCY
This can be used to monitor the actual output frequency of the drive (or the scaled version of
this if P39 is not set to "0") when operating in PI mode, as the normal display is scaled to PI
units according to the MIN and MAX FEEDBACK parameters.
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