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Note
The constant voltage power supply (24VDC) connected to the IV-S20 main housing should
not be ground its positive terminal.
- If the positive terminal of the constant voltage power supply is grounded while using
external equipment connected to the SG or FG terminals, the short circuit shown below will
be created. This circuit will let a large current flow through the SG line inside the IV-S20,
and may destroy the circuit, or cause smoke or a fire.
External equipment
(monitor or the like)
RS-232C RS-422
SG
FG
When the SG or FG conduct current
inside the external equipment
- If the positive terminal of the 24 VDC power supply must be grounded for facility
construction reasons, make sure to provide an independent power supply (exclusively for
use with the IV-S20) which does not ground either the positive or negative terminals.
Installation Conditions and Method
IV-S20 main
Constant voltage power
housing
supply (24 VDC)
for the IV-S20
SG
FG
Grounded positive line
Wraparound current
6- 13
(-)
(+)
Installation floor
6
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