TYPE 4208, “R”
BATTERY CHARGER PANEL
INTRODUCTION
The “R” panel is installed in the main panel A door mounted milliameter is included to
cabinet and it is used for charging remote standby
monitor the trickle charge rate.
batteries. This panel provides a normal (trickle) A door mounted voltmeter is included to indi-
charge rate and a fast charge capability. cate battery voltage.
CHARGING CIRCUIT (FIG. 20)
Normal (Trickle) Charge
The “R” panel converts 12OVAC to -24VDC to
charge the standby battery. Current flows from
the negative side of the rectifier, through variable
resistor R2 (R2 is adjusted according to the par-
ticular battery used - see Table), the milliammeter,
terminal OV, the battery, to terminal +24V. A
voltmeter may be connected between terminal OV
and terminal +24V.
To Adjust The Trickle Charge
Re,sistor R2 is the smaller of the two wire-wound
resistors on the “R” panel and it controls the trick-
le charge to the standby battery.
The trickle charge rate is monitored by the milli-
ameter on the panel.
Adjust resistor R2 to the trickle charge rate list-
ed in the Trickle Charge Rate Table for the partic-
ular battery in the system.
If a “Q” panel is included in the system, add 14
MA to the charge rate listed in the table.
Fast Charge
When the FAST CHARGE switch is operated,
current (2 amps) flows through resistor R 1.
Resistor RI is adjusted at the factory for a maxi-
BATTERY
TYPE
* 4294-l
* 4294-Z
l 4294-3
* 4294-4
= 4294-21
TRICKLE CHARGE
RATE
AMPS @ 77’ F
.005
-010
.OlS
.016
.005
*Lead Acid Batteries
TRICKLE CHARGE RATE TABLE
CAPACITY BATTERY
A. H.
TYPE
8 A. H. 4294-22
16A. H. 4294-23
24A.H. 4294-24
30A.H.
l 4294.25
8 A. H. * 4294.26
TRICKLE CHARGE CAPACITY
RATE
A: H.
AMPS 8 77’ F
-013 13A. H.
.016 18 A. H.
.030 30A.H.
.OlO
16A.H.
.015 24 A. H.
Lead acid batteries are at full charge when voltage per cell is 2.15 volts and specific gravity is approximately 1.215.
Nickel Cadmium voltage is 1.4 per cell.
Both lead acid and nickel cadmium batteries should be checked periodically.
Adjust trickle rate accordingly. A lS” temperature rise doubles the charge rate.
38
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