NXS Form 63-2600, Users Manual, Technical Data - CONTROL ...

194 Description of Parameters Honeywell
1020 PID controller bypass 7 (2.9.16)
With this parameter, the PID controller can be programmed to be bypassed. Then the
frequency of the controlled drive and the starting points of the auxiliary drives are
defined according to the actual value signal. See Figure 8-58.
Output freq.
Max. freq.
(par. ID102)
Start freq. of the aux. drive 1
(par. ID1002)
Start freq. of the aux. drive 2
(par. ID1004)
Minimum freq.
(par. ID101)
Stop freq. of the aux.
drive 1 (par. ID1003)
Stop freq. of the aux.
drive 2 (par. ID1005)
Actual value
Minimum of the
actual value
Maximum of the
actual value
Start/stop control of
the freq. converter stop
start
start
Auxiliary drive 1
stop
start
Auxiliary drive 2
Figure 8-58. Example of variable speed drive and two auxiliary drives with bypassed PID
controller
1021 Analogue input selection for input pressure measurement 7 (2.9.17)
1022 Input pressure high limit 7 (2.9.18)
1023 Input pressure low limit 7 (2.9.19)
1024 Output pressure drop value 7 (2.9.20)
NX12k91
In pressure increase stations there may be need for decreasing the output pressure if
the input pressure decreases below a certain limit. The input pressure measurement
which is needed is connected to the analogue input selected with parameter ID1021.
See Figure 8-59.
stop
Automation and Control Solutions
Honeywell
Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MIN 55422 Scarborough, Ontario 63-2600-1
MIV 4Z9
www.honeywell.com