6 Programming Features
129
Two-wire Sequence 2
Additional to the standard 2-wire or 3-wire sequence a new 2-wire
sequence 2 is available which features a FWD/REV Run 2 Command
(setting 37 for one of the Multi-function Input Selection 1 to 7, con-
stants n050 to n056).
Whenever this FWD/REV Run 2 Command is programmed to one of
the Multi-function Digital Inputs, it switches between forward (ON) and
reverse (OFF) operation, while the standard FWD Run Command (set
value 1 for n050 to n056) works as a RUN/STOP command (i.e. it starts
and stops the inverter operation).
An “ERR” alarm will be displayed when it is tried to set the REV Run
Command (set value: 2) and the FWD/REV Run 2 Command (set value:
37) simultaneously. If this is attempted via communications, constant
setting error message "oP8" will be displayed, and operation will not be
possible.
The following time chart shows the operation of the traditional 2-wire
and 3-wire sequences and the operation of 2-wire sequence 2.
1. Traditional 2-wire Sequence:
Multi-function Input Selection 1 (constant n050): 1
Multi-function Input Selection 2 (constant n051): 2
Multi-function Input Selection 3 (constant n052): Not 0
OFF
OFF
ON
ON
FWD Run
Output frequency
REV Run
S1 terminal: FWD Run Command
S2 terminal: REV Run Command
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