OPERATING FEATURES
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1 OPERATING FEATURES
1.1 DESCRIPTION
The PWR-480B 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. While the direct connection
block is protected by the internal power supply features, the current limiting block is protected
by a Miniature circuit breaker (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
