PS15v24-BRD v3.2 EN Rev.A.doc
2008-04-08
Power Supply Module 27.6V/1.5A
Type PS15v24-BRD
v3.2
P
RODUCT
D
ESCRIPTION
The PS15v24-BRD module is a spare part for PS15v24 power supply however it can be
also used as autonomic power supply module. If used autonomously PS15v24-BRD
requires 34-38VAC and 50W of power and may deliver up to 1.5A DC current without any
time limit. PS15v24-BRD utilizes DC/DC switched mode electronic circuit which offers
high efficiency and small size. Also, it 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-BRD charges
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 be aware that with battery connected to
PS15v24-BRD the total output current will be reduced to 1.2A. Depending on battery
charging phase the output voltage of PS15v24-BRD may vary from approx. 23.0 up to
27.6V level. When battery voltage drops below ~20.0V level internal circuit disconnect it
from load, battery is automatically reconnected when AC supply returns. Battery cut off
circuit protect battery from deep discharge whereas the equipment connected to power
supply from operation below 20.0V level which in many cases can lead to undefined
system behavior. Battery is protected with 5A fuse which reduce maximum output
current sourced from battery and protects electronic circuit against battery reverse
connection. PS15v24-BRD 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-BRD
is equipped with two LEDs, the first one (red) indicates that module has AC supply while
the second one (green) indicates DC output voltage.
PSAM-1
A
LARM
M
ODULE
If required PS15v24-BRD can be equipped with optional PSAM-1 alarm module. The main
purpose of PSAM-1 module is to detect and indicate an alarm situation of power supply to
the external device or system. The PSAM-1 may operate in autonomic or networked
mode and can indicate following conditions:
-
low battery
-
battery failure
-
AC supply lost
-
DC output overload (this state is indicated in networked mode only)
-
DC output level (this state is indicated in networked mode only)
In autonomic mode alarm states are indicated on three transistor outputs: ACL, LB and
BF and on internal buzzer. These outputs can be connected to external control panel,
access controller or another control device which will warn authorized personnel.
Normally, all outputs are in high resistance state, when triggered they switch to supply
minus. The maximum current which can be sink by these output is internally limited to
20mA while the maximum applied voltage should not exceed 30V.
The ACL (Alternative Current Lost) output switches to active state when there is a lack of
AC supply and it lasts for more then 4 minutes. Output returns to normal state
immediately after AC supply returns. The LB (Low Battery) output is triggered when
battery level drops below ~24.0V, it return whenever battery level rise above 24V. The
BF (Battery Failure) output is triggered in case of any situation listed below:
