Fuji Electric Frenic Mini FRN001C1E-2U, Инструкция по эксплуатации

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5-38
E20, E27
Terminal [Y1] Function
Terminal [30A/B/C] Function
E20 and E27 may assign output signals to terminals [Y1] (transistor switch) and
[30A], [30B] and [30C] (mechanical relay contacts) which are general-purpose
programmable output terminals.
These function codes may also switch the logic system between normal and
negative to define how the inverter logic interprets either ON or OFF status of each
terminal.
Terminals [30A], [30B], and [30C] are mechanical relay contacts. In the normal logic,
if an alarm occurs, the relay will be ordinarily excited so that [30A] and [30C] will be
short-circuited, signaling an occurrence of the error to external equipment. On the
other hand, in the negative logic, the relay will cut off the excitation current to open
[30A] and [30C]. This may be useful for the implementation of fail-safe power sys-
tems.
If negative logic is active, powering off the inverter switches all output
signals to the active side (for example, the alarm side). To avoid adversary
effects caused by this, make an appropriate arrangement outside the
inverter as necessary, for example, interlocking its operation with a
power-on signal.
Since terminals [30A/B/C] are mechanical relay contacts, they cannot
withstand frequent on/off operations. If frequent signal outputs are ex-
pected e.g., assigning any current limiter signal and activating the current
limiter actively, then use [Y1]. For rare signal outputs, e.g., for inverter
protection purpose, use [30A/B/C].
The service life of a mechanical relay contact is 200,000 on/off operations
at one-second intervals.
To keep explanations as simple as possible, the examples shown below are all
written for the normal logic system.
„ Inverter running (Speed > 0)--
RUN
(Function code data = 0) 㩷
This signal is turned on when the inverter is running at the starting frequency or
higher.
„ Frequency arrival signal--
FAR
(Function code data = 1) 㩷
This signal is turned on when the difference between the output and reference
frequencies comes into the allowable error zone (prefixed to 2.5 Hz).
„ Frequency level detection--
FDT
(Function code data = 2) 㩷
This signal is turned on when the output frequency of the inverter comes into the
frequency detection level specified by function code E31. It is turned off when the
output frequency drops lower than the detection level for 1 Hz (hysteresis band of
the frequency comparator: prefixed at 1 Hz).