Pyronix PCX 78, Installation Manual, Page: 73 / 100

Nominal Range
Over Voltage Protection Trigger Voltage: 18V
PCX power supplies are NOT designed for use with multiple batteries connected.
System load should not exceed the panel power supply output or the maximum load supportable by the battery for the
specified backup time.
The power ratings are based on battery shown in table – but ANY battery capable of supporting the system load for the
required time may be used without affecting these ratings.
Panel Power Supply Input Mains Supply Voltage
AC 230V AC at 50Hz -15% +10%
Transformer Rating
PCX S 18VA 18V at 1.0A
Transformer Rating
PCX L 45VA 18.5V at 2.5A
Table 16 - Battery Charging Specification
Float Voltage 13.8v DC Standby battery capacity current
Battery low voltage cut off 10.5v PCX S 300mA (3A to 6A)
Recharge time <24 Hours PCX L 700mA (7A to 17A)
Table 17 - EN50131-6:2008 Rated Output
Electrical Capability EN50131-6 Rating. Maximum Load
Example Battery Model Grade 2
Yuasa NP7-12 0.5A
Yuasa NP17-12 1.2A
In accordance with EN50131-6:2008, the PCX standby times and effective output currents depend
on the Security Grade of the system and how 230V mains missing fault is signalled to the Alarm
Receiving Centre. Power supplies are rated in accordance with the requirements of EN50131-6,
which are related to the maximum battery size that can be accommodated in the housing and vary
according to the grade of the system in which they are installed.
Table 18 - PCB Current Consumption
Quiescent 80mA
Table 19 - User Code and Tag Guessing
4-digit codes 10,000
6-digit codes 100,000
Disallowed codes None
All codes 1612
According to EN50131-3:2009 Annex B
According to spec of manufacturer of RFID components used
PCX Installation Guide 102017852 - V01 73