Basic Programming 5 - 12
The setting of parameter b5-21 determines whether the PI Sleep Function Start Level (b5-15) is compared to the speed com-
mand as determined by b1-01 (b5-21=0), the output of the PI function summed with the Speed Command (b5-21=1), or not
used at all (b5-21=2). If b5-21=2, then the system feedback is compared to a preset level to awaken the Drive from the Snooze
Function. (see parameter b5-22)
b5-17 PI Accel/Decel Time
This is a soft start function that is applied to the speed command and/or PI setpoint. Instead of having nearly instantaneous
changes in reference levels, there is a programmed set ramp applied to level changes.
b5-18 PI Setpoint Selection
When PI Setpoint is enabled (b5-18=1) parameter b5-19 is used as the PI Setpoint. If b5-18=0 (disabled), the PI Setpoint will
be either Modbus Register 06H (if Register 0FH bit 1 is high), or the active speed command before PI was enabled (e.g., the
setting of b1-01.
b5-19 PI Setpoint Value
Parameter b5-19 is a preset PI Setpoint value. When b5-18=1, the value of b5-19 will take precedent over any other PI
setpoint unless the Drive is set up for Differential Feedback, in which case, b5-18 has no affect on the PI function.
b5-20 PI Setpoint Display Scaling
The PI Setpoint Display Scaling value (b5-20) is a scaling factor that is applied to the monitor display for both the PI Setpoint
(U1-38) and the PI Feedback (U1-24).
If the monitors seem most natural in terms of percentage, set b5-20=1. If the monitors are easiest to work with when
displaying the equivalent synchronous RPM, set b5-20= [the number of motor poles]. If another engineering unit, such as fpm
or cfm, is desired, set b5-20=xxxx, where Digits 1 through 3 set the desired number to be displayed at 100% speed and Digit 4
determines the number of decimal places.
Table 5.2 PI Setpoint Display Scaling Options
If b5-20 is:
U1-24 and U1-38
Display Increments.
00.01 Hz
10.00%
2 through 39
(enter the # of motor poles)
0 R P M
40 through 39999 Engineering Units
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