OPERATING FEATURES
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1 OPERATING FEATURES
1.1 DESCRIPTION
The PWR-2400 is an electrical cabinet housing five 24 Vdc power supply units 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 each
protective thermo-magnetic circuit breaker and connects to the monophase switching power
supplies.
For each monophase switching power supply, the 24 Vdc output power is connected to the
output terminal blocks. The last power supply block also provides protection through a
Miniature circuit breaker (MCB), 4 A, 1p, C-Char.
For each monophase switching power supply, 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
Each power supply implements both output short-circuit and overload protection.
1.2.1 Short-Circuit Protection
For each monophase switching power supply, if a short-circuit occurs on the output lines
causing the output voltage to drop below 20 Vdc, the hiccup mode is entered 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
