Operating Features; Description; Output Protection; Short-Circuit Protection - Datalogic PWR-480W Instruction Manual

OPERATING FEATURES

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1 OPERATING FEATURES

1.1 DESCRIPTION

The PWR-480W is an electrical cabinet housing a 24 Vdc power supply which is used to
power up a varying number of reading devices (depending on the product), along with their
relative accessory devices. See chapter 4 for details.
As shown in the Electrical Diagram in Appendix A, the AC Input Line passes through a
protective thermo-magnetic circuit breaker and connects to the monophase switching power
supply.
The 24 Vdc output power is connected to the output terminal blocks divided into two
sections: a direct connection block and a current-limiting block (composed of three sections).
While the direct connection block is protected by the internal power supply features, the
current limiting block is protected by three Miniature circuit breakers (MCB), 4 A, 1p, C-Char.
Two output power supply status monitoring signals (DC-OK) are provided to connect to an
optional digital alarm. If for some reason the output voltage is reduced by less than 90% of
nominal, these lines open.

1.2 OUTPUT PROTECTION

The power supply implements both output short-circuit and overload protection.

1.2.1 Short-Circuit Protection

If a short-circuit occurs on the output lines causing the output voltage to drop below 20 Vdc,
the power supply enters hiccup mode where power is supplied for 2 seconds and then shuts
off for 17 seconds. This procedure is repeated until the short-circuit is resolved. Refer to the
diagram below.
Figure 3 – Short-Circuit Protection Hiccup Mode
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