MA7200 PLUS Operating Manual
TECO – Westinghouse Motor Company (Sn-25 – Sn-28) Multi-Function Input Terminals 5-8
Cont
. Parameter Details
.
Sn-25-28=00
3-wire operation mode
When parameter Sn-03 = 8,10 or 12, 3-wire initialization mode, the multi-function input terminals
-
will be set
for 3-wire operation. As shown in Fig.9.2.3.10, the Forward / Reverse control mode is set at terminal
.
3-Wire Connection Diagram 3-Wire Operation Sequence
Fig. 9.2.3.10 3-Wire Operation (Sn-28=00)
Sn-25-28=0 1
Input STOP Command during 2-Wire Mode Operation
The Stop command can be only set by parameter Sn-25 (Terminal
).
When initialized for standard 2-wire operation as shown in Fig.
9.2.3.11a, S1 and S2 can not be both ON at the
same time. When S1= ON and S2= OFF, the motor runs FWD. When S1=OFF and S2= ON, the motor runs
REV. When S1= OFF and S2= OFF, the motor Stops.
When Sn-25= 01, the 2-wire operation mode has its self-sustaining function. Only through the multi-function
input terminal
can the inverter can be stopped after pressing the STOP key as shown in Fig.9.2.3.11b. The
switches S1, S2 and S3 are momentary switches. When S1 is pressed, the motor will run FWD. When S2 is
pressed, the motor will run REV. When S3 is pressed, the motor will stop.
a. b.
Fig. 9.2.3.11 2-Wire Operation
Note
: 1. With the exception of Sn-28= 00 or 01, the external operation mode is defaulted to 2-wire operation
and no self-sustaining function. i.e., the inverter will stop when the input contact at terminals
and
are not closed.
2. In 2-wire mode, the error message “Freq. Comm. Error” will be displayed by the digital operator
when terminals
and
are both ON at the same time, and the inverter will stop. When cleared,
the inverter will return normal.
Cont.
