Fuji Electric FRENIC-HVAC User Manual page 416

E20 to E23 Terminal [Y1] to [Y4] Functions
E24, E27 Terminal [Y5A/C] and [30A/B/C] Functions (Relay output)
E20 through E24 and E27 assign output signals (listed on the following pages) to
general-purpose, programmable output terminals, [Y1] to [Y4], [Y5A/C] and [30A/B/C].
These function codes can also switch the logic system between normal and negative to define
how the inverter interprets the ON or OFF state of each terminal. The factory default setting is
normal logic system "Active ON."
Terminals [Y1] to [Y4] are transistor outputs and terminals [Y5A/C] and [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 negative logic is employed, all output signals are active (e.g. an alarm
• Terminals [Y5A/C] and [30A/B/C] use mechanical contacts that cannot stand
The tables given on the following pages list functions that can be assigned to terminals [Y1]
to [Y4], [Y5A/C], and [30A/B/C].
The descriptions are, in principle, arranged in the numerical order of assigned data. However,
highly relevant signals are collectively described where one of them first appears. Refer to the
function codes or signals in the "Related function codes/signals (data)" column, if any.
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 (for 30 HP or below) or 3 seconds (for
40 HP or above) after power-ON, so introduce such a mechanism that masks
them during the transient period.
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 or direct-on-line starting),
use transistor outputs [Y1], [Y2], [Y3] and [Y4] instead. The service life of a
relay is approximately 200,000 times if it is switched ON and OFF at one-second
intervals.
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