4-91
Universal DO --
U-DO
(Function code data = 27)
Assigning this output signal to an inverter's output terminal and connecting the terminal to a digital input terminal of
peripheral equipment via the RS-485 communications link or the fieldbus, allows the inverter to send commands
to the peripheral equipment.
The universal DO can also be used as an output signal independent of the inverter operation.
For the procedure for access to Universal DO via the RS-485 communications link or fieldbus, refer to the
respective instruction manual.
Heat sink overheat early warning --
OH
(Function code data = 28)
This output signal is used to issue a heat sink overheat early warning that allows for corrective action before an
overheat trip
0h1
actually happens.
This signal comes ON when the temperature of the heat sink exceeds the "overheat trip temperature minus 5°C
(41°F)," and it goes OFF when it drops down to the "overheat trip temperature minus 8°C (46°F)."
This signal comes ON also when the internal air circulation DC fan (75 HP or above for 230 V series or 125 HP or
above for 460 V series) has locked.
Synchronization completed --
SY
(Function code data = 29)
This output signal comes ON when the control target comes inside the synchronization completion detection angle
in synchronous running.
For details about synchronous operation, refer to the PG Interface Card instruction manual.
Lifetime alarm --
LIFE
(Function code data = 30)
This output signal comes ON when it is judged that the service life of any one of capacitors (DC link bus capacitors
and electrolytic capacitors on the printed circuit boards) and cooling fan has expired.
This signal should be used as a guide for replacement of the capacitors and cooling fan. If this signal comes ON,
use the specified maintenance procedure to check the service life of these parts and determine whether the parts
should be replaced or not. (Refer to Chapter 7 of the user manual, Section 7.3 "List of Periodic Replacement
Parts.")
This signal comes ON also when the internal air circulation DC fan (75 HP or above for 230 V series or 125 HP or
above for 460 V series) has locked.
Under PID control --
PID-CTL
(Function code data = 43)
This output signal comes ON when PID control is enabled ("Cancel PID control" (
Hz/PID
) = OFF) and a run
command is ON. (Refer to the description of J01.)
When PID control is enabled, the inverter may stop due to the slow flowrate stopping function or other
reasons, with the
PID-CTL
signal being ON. As long as the
PID-CTL
signal is ON, PID control is effective,
so the inverter may abruptly resume its operation, depending on the feedback value in PID control.
When PID control is enabled, even if the inverter stops its output during operation because of sensor signals or
other reasons, operation will resume automatically. Design machinery so that safety is ensured in consideration
of these events.
Otherwise, accidents could occur.
