EQUIPMENT: T1200-C
PUBLICATION: MARINEC-P-A
ISSUE No. & DATE: 3 02/14
© 2014 Thorn Security Ltd PAGE 37 of 67
Registered Company: Thorn Security Ltd. Registered Office: Dunhams Lane Letchworth Garden City Hertfordshire SG6 1BE
14.3.6 Battery Charger
PS136-1-09 AC mains supply version:
The PS136 PSU is designed to charge lead acid
cells of 24V nominal voltage. It is capable of
recharging 12Ah to 17Ah SLA batteries to 80% fully
charged capacity in 24 hours.
PS40-1-09 DC primary supply version:
The PS40 PSU is designed to charge lead acid
cells of 24V nominal voltage. It is capable of
recharging 3.4Ah to 7Ah SLA batteries to 80% fully
charged capacity in 24 hours.
On both AC and DC versions, the charging voltage
is set at the factory and should not require field
adjustment.
The output current is shared between the panel
load and battery charging. The battery charging
current is therefore dependent on output current
and will fall to zero as the panel load approaches
the specified maximum output current.
14.3.7 PS40-1-09 and PS136-1-09
Temperature Compensation
The chargers provide a temperature-compensated
charging voltage over a battery temperature range
of –10
o
C to +55
o
C. A Thermistor sensor, located at
the battery, is used to sense the ambient
temperature. The Thermistor circuit is monitored for
open and short circuit faults.
14.3.8 PS40-1-09 and PS136-1-09
Charger Monitor
The output from the charger is monitored to ensure
that the battery is being charged. A fault is reported
within 90 seconds of a fault occurring.
14.3.9 PS40-1-09 and PS136-1-09
Battery Health Functions
Battery connections reversed or short circuited:
The battery and circuit are protected from reverse
or short circuit wiring.
14.3.10 PS40-1-09 and PS136-1-09
Battery Test
A battery test to determine the Battery plus inter-
connection resistance is automatically carried out
approximately every 20 minutes. Similarly, a test to
see if the Battery is present is carried out every 30
seconds.
14.3.11 PS40-1-09 and PS136-1-09
Battery Disconnect
If the primary supply fails and the panel is running
from the battery standby supply only, the battery
will be automatically disconnected (electronically
isolated) when the voltage drops below 21V. The
battery is automatically re-connected when the
primary supply returns.
If a short circuit occurs in the battery wiring or
inside the batteries, then the disconnect circuit
isolates the battery from the charger.
14.3.12 PS40-1-09 and PS136-1-09
Indications on the PSU
Charger Fault (LED 2 – yellow)
This LED is on when the fault condition is active
(battery not being charged), i.e.:
• Charger output below battery voltage.
• Failure of AC or DC primary supply.
• Battery Thermistor is either open circuit or short
circuit.
Battery Fault (LED 3 – yellow)
This LED is on when the fault condition is active,
i.e.:
• Battery is open circuit or short circuit.
• Battery fuse has blown or battery wiring has
become disconnected.
• Battery plus inter-connection resistance is
greater than 0.6 ohms.
Primary Supply (LED 1 – green)
This LED is normally illuminated and extinguishes
in the event of failure of the primary supply.
14.4 PS40-1-09 and PS136-1-09 Fault
Outputs
Two open collector type outputs are provided, both
active low in the healthy condition, high impedance
in the fault condition. Both are used internally to
signal to the fire panel.
Common Fault:
Operating for primary supply failed, battery fault or
charger fault.
Primary Supply Failed:
Operating for primary supply failed.
14.4.1 Safety Earth
Warning. A safety earth wire is connected to the
Power Supply Equipment chassis and terminated
with a ferrule. To ensure safe operation, this lead
must be connected to the enclosure earth point at
all times.
14.5 PS40-1-09 & PS136-1-09
Mechanical Protection
Warning:
These power supplies use hazardous voltages.
The units are fitted with a protective cage to
protect service access users from electrical
shock. Disconnect from mains before opening.
To prevent overheating, the ventilation holes in
the cage must not be obscured.
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