MA7200 PLUS Operating Manual
TECO – Westinghouse Motor Company P2-08
cont.
Parameter Details
P1-08
External PID feedback source
P1-08=1: Terminal VIN
2: Terminal AIN
3: Terminal AUX
The External PID Function P1-06 is used to activate the external PID function and to set output terminal AO1
or AO2 to external PID output signal.
The External PID Function is enabled when P1-06 is set to a nonzero value and the inverter is in the DRIVE
mode, independent of the RUN / STOP status of the inverter
If the External PID Function P1-06 is set to select output AO1 or AO2, the corresponding parameter Sn-33 or
Sn-34 will be set to = 14 (Ext. Output 2) automatically, and cannot be changed until P1-06 is set = 0 (Invalid).
The External PID Set Point Source P1-07 and External PID Feedback Source P1-08, are used to select the input
source of the set point and feedback of the external PID function as shown in the following table 9.2.4.3.
Table 9.2.4.3 External PID Set Point and Feedback Selection
Value
Parameter P1-07
(External PID Set Point Source)
Parameter P1-08
(External PID Feedback Source)
0
Keypad (Parameter P2-05)
--------
1
Terminal VIN
Terminal VIN
2
Terminal AIN
Terminal AIN
3
Terminal AUX
Terminal AUX
4
RS-485 Communication
(0x0009, 1000/100.0%)
--------
If P1-07 and P1-08 set to the same source, the
"Ext PID Setting Error"
message will be displayed.
Generally, each of the analog input terminals AIN (0/4-20mA), VIN (0-10V), and AUX (0-10V), can be used for the
following provided that certain conditions are met :
1- Frequency Command Source, when Sn-05=1
2- Main PID function, when SN-64=1 for both set point and feedback.
3- External PID, when P1-06= 1 or 2 for both set point and feedback.
When selected by a given function, that analog input is not available for any other function, and must be
considered when planning for a particular application.
If any of the unavailable terminals are selected as the
External PID Function set point or feedback source, an "Ext PID Setting Error" message will occur.
The following tables 9.2.4.4a and 9.2.4.4b serve to further illustrate the terminals that are available to the external
PID loop under the conditions specified.
Table 9.2.4.4a
Terminals available for external PID while (main) PID is
DISABLED
(Sn-64 = 0)
Sn-05
Setting
Sn-24
Setting
Sn-29
Setting
Terminals
Available to Ext.
PID
Comment
1
0
0
AIN, AUX
VIN (0-10V) is used as the Frequency command
1
VIN, AUX
AIN (0/4-20mA) is used as the Frequency command
2 or 3
AUX (0-10V)
VIN & AIN are used as the Frequency command
0, 2 or 3
-----
VIN, AIN, & AUX
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Cont.