Enable communications link via RS-485 --
LE
(Function code data = 24)
Turning this terminal command ON assigns priorities to frequency commands or run
commands received via the RS-485 communications link (H30).
No
LE
assignment is functionally equivalent to the
LE
being ON. (Refer to the description of
H30.)
Run forward --
FWD
(Function code data = 98)
Turning this terminal command ON runs the motor in the forward direction; turning it OFF
decelerates it to stop.
This terminal command can be assigned only by E98 or E99.
Run reverse --
REV
(Function code data = 99)
Turning this terminal command ON runs the motor in the reverse direction; turning it OFF
decelerates it to stop.
This terminal command can be assigned only by E98 or E99.
E20
Terminal [Y1] Function
E27
Terminal [30A/B/C] Function (Relay output)
E20 and E27 assign output signals (listed on the next page) to general-purpose, programmable
output terminals [Y1] and [30A/B/C]. These function codes can also switch the logic system
between normal and negative to define the property of those output terminals so that the inverter
logic can interpret either the ON or OFF status of each terminal as active. The factory default
settings are "Active ON."
Terminal [Y1] is a transistor output and terminals [30A/B/C] are relay contact outputs. In normal
logic, if an alarm occurs, the relay will be energized so that [30A] and [30C] will be closed, and
[30B] and [30C] opened. In negative logic, the relay will be deenergized so that [30A] and [30C]
will be opened, and [30B] and [30C] closed. This may be useful for the implementation of
failsafe power systems.
• When a negative logic is employed, all output signals are active (e.g. an alarm
would be recognized) while the inverter is powered OFF. To avoid causing
system malfunctions by this, interlock these signals to keep them ON using an
external power supply. Furthermore, the validity of these output signals is not
guaranteed for approximately 1.5 seconds after power-on, so introduce such a
mechanism that masks them during the transient period.
• Terminals [30A/B/C] use mechanical contacts that cannot stand frequent
ON/OFF switching. Where frequent ON/OFF switching is anticipated (for example,
limiting a current by using signals subjected to inverter output limit control such as
switching to commercial power line), use transistor output [Y1] instead. The
service life of a relay is approximately 200,000 times if it is switched ON and OFF at
one-second intervals.
5-49
