3 Installation
3.5 Electrical Installation
72 DC1 variable frequency drive 12/13 MN04020003Z-EN www.eaton.com
3.5.2.8 Digital Input Signals
Control signal terminals 2, 3, 4, and 6 all have the same function and mode of
operation as digital inputs (DI1 to DI4).
A logic level of +24 V (positive logic) is used:
• 8 - 30 V = High (logic "1")
• 0 - 4 V = Low (logic "0")
The internal control voltage from control signal terminal 1 (+24 V, maximum
100 mA) or an external voltage source (+24 V) can be used for this. The
permissible residual ripple must be less than ±5 % U
a
/U
a
.
Optional modules DXC-EXT-IO110 and DXC-EXT-IO230 can be used to opti-
cally isolate the digital inputs (DI1 to DI4) and integrate them directly into
control circuits with 110 V / 230 V. Values of 80 to 110/230 V AC will be
recognized as a high signal.
￫
If you use an external voltage source, make sure to connect the
0-V potentials of the externalvoltage source to the 0-V potentials
of the variable frequency drive.
￫
Control signal terminals 7 and 9 are the common 0 V reference
potential for all analog and digital input signals.
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