Rockwell Automation 1336F PLUS II User Manual - Firmware 1.xxx-6.xxx - Manual (Page 136)

6–54 Programming
Process PI
[PI Status]
This parameter displays the status of the Process PI
regulator.
Parameter Number 214
Parameter Type Read Only
Factory Default None
[PI Ref Select]
The source of the PI reference is selected with this param-
eter. The value from the selected reference is the “set
point” for the Process PI regulator.
The drive is capable of responding to a loss of the 4-20
mA signal used as either a PI reference or PI feedback.
Response to loss of 4-20 mA signal is controlled by pro-
gramming and requires the following:
a) [Speed Control] must be set to “Process PI”
and
b) Either [PI Ref Select] or [PI Fdbk Select] must be set to
“4-20 mA.”
If both of the above conditions are met, the signal loss
response is controlled by the setting of [4-20 mA Loss Sel].
If this parameter is set to “Stop/Fault,” loss of input will
cause the drive to stop and issue a Hertz Err Fault. Loss
of input while any other setting of [4-20 mA Loss Sel] is
chosen will cause the drive to activate the alarm bit (bit 6
of [Drive Status] and bit 13 of [Drive Alarm]) and output
programmed [Minimum Freq].
Signal loss protection is offered for the 2-10V input.
Parameter Number 215
Parameter Type Read/Write
Factory Default “Preset 1”
Units Display Drive
“Use Last” 0
“Analog In 0” 1
“Analog In 1” 2
“Analog In 2” 3
“Pulse Ref” 4 Refer to [Pulse In Scale] Value
“MOP” 5
“Adapter 1-6” 6-11
“Preset 1-7” 12-18
“Encoder” 19 Refer to [Encoder PPR] Value
Diagram 1
Time
Enable
PI
Output
Command
Output
Freq.
Disable
0 24 21 27 30 18 15 12 9 6 3
Enable PI output integrates from zero – drive ramps
to regulated frequency.
Disable PI output is forced to zero – drive ramps to
unregulated frequency.
Enable PI output steps to preload and integrates
from there – drive steps to preload and
ramps from there.
Disable PI output is forced to zero - drive ramps to
unregulated frequency.
Enable PI output integrates from preload – drive
ramps from preload.
Disable PI output is held at preload - drive ramps to
unregulated speed (min. preload).
Note: Drive will step output equal to preload on
Diagram 2
Enable Disable
0 24 21 27 30 18 15
Preload
12 9 6 3
Diagram 3
Enable Disable
0 24 21 27 30 18 15 12 9 6 3
Preload
Preload
Preload at Start
Preload at Start
Preload
Feed forward effect for
more dynamic
Better response for
well defined
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Enabled
Spares