GE AF-650 GP Series, Design And Installation Manual

Page: 82 / 166

Comparators
Comparators are used for comparing continuous variables
(i.e. output frequency, output current, analog input, etc.) to
fixed preset values.
Figure 6.26
Logic Rules
Combine up to three Boolean inputs (TRUE/FALSE inputs)
from timers, comparators, digital inputs, status bits and
events using the logical operators AND, OR, and NOT.
Figure 6.27
Application Example
Parameters
Function Setting
H-20 Motor
Feedback Loss
Function
[1] Warning
H-21 Motor
Feedback Speed
Error 100 RPM
H-22 Motor
Feedback Loss
Timeout 5 s
PI-00 Speed PID
Feedback Source [2] OPCENC
EC-11 Resolution
(PPR) 1024*
LC-00 Logic
Controller Mode [1] On
LC-01 Start
Event [19] Warning
LC-02 Stop
Event [44] Reset
key
LC-10 Comparat
or Operand [21] Warning
no.
LC-11 Comparat
or Operator [1] ≈*
LC-12 Comparat
or Value 90
LC-51 Logic
Controller Event [22]
Comparator 0
LC-52 Logic
Controller Action [32] Set
digital out A
low
E-24 Function
Relay [80] Logic
Control
digital output
A
* = Default Value
Notes/comments:
If the limit in the feedback
monitor is exceeded, Warning
90 will be issued. The LC
monitors Warning 90 and in the
case that Warning 90 becomes
TRUE then Relay 1 is triggered.
External equipment may then
indicate that service may be
required. If the feedback error
goes below the limit again
within 5 s then the drive
continues and the warning
disappears. But Relay 1 will still
be triggered until [Reset] on
the keypad.
Table 6.23 Using Logic Controller to Set a Relay
Application Setup Examples AF-650 GP
TM
Design and Installation Guide
DET-767A 6-27
6 6