MA7200 PLUS Operating Manual
TECO – Westinghouse Motor Company App-2 Fan and Pump
1.5 PID Over Feedback Signal Function
Table1.5.1 below shows the parameters for the PID over feedback signal function.
Table1.5.1 PID Over Feedback Signal Function
Parameter
No.
LCD Display
Setting Range
Factory Setting
Change During
Operation
Modbus
Address
P3-04
P3-04
Over Feedback Level
*000.00 - 099.99%
000.00%
NO
0x0803
P3-05
P3-05
Over Fbk. Delay Time
0000.0 - 6000.0s
0003.0s
NO
0x0804
P3-06
P3-06
Over Fbk. Action
0: None
1: Over Feedback
Alarm
2: Over Feedback
Fault
0 NO
0x0805
Sn-30
- Sn-32
Multi-Function Output
(RA-RB-RC, DO1,
DO2 or R2 Relay)
Function Selection
25: Over Feedback
* The engineering units and range are set by parameter P1-01
If PID is enabled (Sn-64
≠
0), Over Feedback Detection is enabled if P3-06 Over Feedback Action is set to =1
or 2
or
at least one of Multi-Function Outputs Sn-30 (Relay), Sn-31 (DO1), or Sn-32 (DO2 or R2 Relay) is set
to =25 (Over Feedback)
When PID feedback rises above the Over Feedback Level set via P3-04 for the time exceeding the
programmed Over Feedback Delay Time P3-05, the inverter status will be controlled by parameter P3-06 Over
Feedback Action as shown in the following Table 1.5.2. Also if any of the Multi-Function Outputs Sn-30 (Relay),
Sn-31 (DO1), or Sn-32 (DO2 or R2 Relay) are set to =25 (Over Feedback), that output will be turned ON.
Table 1.5.2 PID Over Feedback Signal Action
P3-06
Value
Inverter Status while
Over Feedback
Message
while Over Feedback
0
Continue Running
No Message
1
Continue Running
Over Feedback Alarm
2
Shut Down
Over Feedback Fault
Fig.1.5.1 below is a block diagram illustrating the Over Feedback Detection Function.
Fig. 1.5.1 Over Feedback Signal Function