CERUS CI-007-P2 - External PID Mode Activation; External PID Reference Signal Selection; External PID Set-point Value; External PID Feedback Source Selection

Chapter 6 - Parameter Description
6-35
APP  ExtSetPoint
80 50.0 %
APP  Ext Fbk Sel
81 I
APP  ExtFbk Unit
82 %
Main- the alternation mode is enabled and VFD
will alternate auxiliary motors on the VFD output
by run time timer.
APP-67- the alternation run time timer setting is in
hours. The VFD counts only run time and when it
exceeds APP-67 and VFD output frequency is
lower than APP-68 setting, VFD stops the motor,
deactivates its relay, then closes next motor relay
and starts again.
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APP-69 enables an
MMC motor interlock
(disable) feature if it is set to Yes. Any motor Aux
relay can be disabled by corresponding digital input
set to interlock.
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APP-78 enables
external (2
nd
) PID
control if it is set to Yes. External PID can be used
to process system value (pressure, temperature etc)
and provide output to VFD speed reference, analog
0-10VDC output or set-point of the main PID
control.
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APP-79 allows four
reference (set-point)
source selections: I, V1, Pulse and Keypad. Refer to
SET-10 for detailed description.
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APP-80 determines the
external PID set-point
value as a percentage of the maximum feedback
value.
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APP-81 allows three
feedback signal source
selections: I, V1 and Pulse. Refer to SET-10 for
detailed description.
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APP-82 allows
following feedback
signal unit selections: %, PSI, °F, °C, inWC, inM,
Bar, mBar, Pa, kPa and Custom. Refer to SET-22
for detailed description.
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APP-84 is the external
PID maximum
feedback unit value.
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H
APP-85, 86, and 87 are the P-Gain, I-Time and D-
Time parameters for external PID setup. Refer to
the description for these parameters settings in
SET-29 ,30 and APP-09.
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 
APP-88- The PID Output High Limit setting.
APP-89- The PID Output Low Limit setting.
APP  interlock
69 No
APP  Ext PI Mode
78 No
APP  Ext Ref Sel
79 Keypad
APP  ExtFbk UnitH
84 100.0 %
APP  ExtPID PGain
85 1.0 %
APP  ExtPID ITime
86 10.0 sec
APP  ExtPID DTime
87 0 ms
APP  ExtPID LmtH
88 100.0 %
APP  ExtPID LmtL
89 0.0 %
VFD Output to Motors
M1
M2
M3
M4
P
-
VFD
Line Power
External
Relays
Motor 4
Motor 3
Motor 2
Motor 1
RLY1
RLY2
RLY3
RLY4
Aux1
Aux 2
Aux 3
Aux 4