PS15v24 v3.2 EN Rev.C.doc
2007-10-23
1
Power Supply
Type PS15v24
v3.2
P
RODUCT
D
ESCRIPTION
The PS15v24 is dedicated for electronic equipment which requires 24VDC buffered
power supply. Device consist of metal case with compartment for sealed lead-acid
battery, mains transformer and electronic circuit. PS15v24 may deliver up to 1.5A
current without any time limit, it utilize DC/DC “switched mode” electronic circuit which
offer high efficiency (reduced heating of electronic components). PS15v24 employs
internal current limiting and short circuit protection which make it essentially
indestructible. The reserve battery is connected to output terminals trough an ultra low-
resistance MOS transistor, such a circuit architecture enables optimum performance
during AC failure and during dynamic changes of load when excessive current
consumption is required. PS15v24 charge battery with
constant current-constant voltage
method, this method of charging guaranties relatively quick and safe charging process.
The initial charging current is factory set to ~300mA, installer should notice that with
battery connected to PS15v24 the output current will be reduced to 1.2A. Depending on
battery charging phase the output voltage of PS15v24 may vary between 23.0..27.6V
level. When battery voltage drops below ~20.0V internal circuit disconnect it from load,
battery is automatically reconnected when AC supply returns. Battery cut off circuit
protect battery from deep discharge but the equipment connected to power supply from
operation below 20.0V level which in many cases might lead to undefined system
behavior. Battery is protected with 5A fuse which reduce maximum output current
sourced from battery and electronic circuit against battery reverse connection. PS15v24
offers two output ports (Z1 and Z2 terminals). The nominal output voltage is factory set
to 27.6V and should not be changed by user. PS15v24 is equipped with two LEDs, the
red one (marked as 230VAC) indicates that the AC power supply exists where the second
one (marked as 24VDC) signals that output voltage is available.
O
PTIONAL
A
LARM
M
ODULE
PSAM-1
For more sophisticated installation electronic circuit of PS15v24 can be equipped with
optional alarm module (PSAM-1). This module can be connected to PS15v24 circuit
through dedicated connector (CON4) which is located on PS15v24 board. The main
purpose of PSAM-1 module is to signal an alarm situation of power supply to external
device or system. The PSAM-1 may operate in
autonomic
or
networked
mode. When
set to autonomic mode it offers three transistors outputs which are dedicated to signal
following situations:
-
low battery
-
battery failure
-
AC lost
These outputs can be connected to external system or it can trigger warning device (e.g.
siren, buzzer etc.).
When PSAM-1 operates in networked mode it must be connected to PR series access
controller (type PRxx2) through Clock & Data lines. In this mode PSAM-1 module sends
all messages about power supply condition direct to access controller. When in
networked
mode PSAM-1 indicates the same alarm conditions as in standalone mode
plus additionally delivers data about actual voltage level available on PS’s output.
