MA7200 PLUS Operating Manual
TECO – Westinghouse Motor Company (Sn-25 – Sn-28) Multi-Function Input Terminals 5-8
Cont
. Parameter Details
Sn-25-28=26
Speed Control Action without PG
Sn-25-28=27
Reset Integration of Speed Control with PG
When PG feedback is used, the integral control (used with PG feedback compensation) can be disabled or
enabled from the external control terminals. The external terminals can also be used to clear the integral value.
(See Fig. 9.2.3.15 below)
Fig. 9.2.3.15 PG Speed Control Block Diagram
Sn-25-28=28
Frequency UP/DOWN Function
The output frequency can be changed up or down using either the digital operator or the external multi-function
input terminals (
or
).
By setting parameters Sn-04=1 and Sn-05=1, the run source and frequency command is set through the
control circuit terminals. By setting parameter Sn-28=28, terminal
will now have the UP function and
its original function is disabled. Terminals
and
can now be used for the UP / DOWN function to
control or change the output frequency.
The Operation sequence is as shown below:
Control circuit terminal
: UP function
ON
OFF
OFF
ON
Control circuit terminal
: DOWN function
OFF ON OFF ON
Operation status
ACC
(UP)
DEC
(DOWN)
Constant
(HOLD)
Constant
(HOLD)
See Fig. 9.2.3.16 below.
FWD/ REV
UP
Output Freq.
DOWN
Upper Limit
Lower Limit
Terminal or
Terminal
Terminal
U = UP (ACC)
U1 = Bounded by upper_limit when ACC
D = DOWN (DEC)
D1 = Bounded by lower_limit when DEC
H = HOLD (Constant)
1
2
7
8
Fig. 9.2.3.16 Time Chart of Output Frequency with UP/DOWN Function
Cont.