3
Current Limit Protection
The Power-Pac is protected against damage due
to overloads or shorts on the output by an automatic current limiting circuit.
Fusing
AC input and internal and external batteries are fused for additional
protection against high current conditions.
Automatic Thermal Shutdown
The Power-Pac is protected against over-
heatinf (when duty ratings are exceeded) by an automatic thermal shutdown
circuit. When a safe operating temperature is restored, the Power-Pac automati-
cally returns to service.
III) FEATURES ILLUSTRATION
For this illustration, refer to section IV) A, B, C:
EXTERNAL
FAILURE
N.C.
C.
N.O.
AC
RADIO
FUSE 20A
115VAC 4A
230VAC 2A
115V
FUSE 20A
WARNING:
DISCONNECT POWER BEFORE SERVICING OR
REPLACING THE FUSE. DO NOT OPEN. REFER
SERVICING TO A QUALIFIED TECHNICIAN.
BATT
+
+
FU
SE
*F
USE*F
U
SE*
FU
SE
*F
USE*F
U
SE*
FU
SE
*F
USE*F
U
SE*
FU
SE
*F
USE*F
U
SE*
FU
SE
*F
USE*F
U
SE*
FU
SE
*F
USE*F
U
SE*
POWER CORD
For this illustration, refer to the numbered items in section IV)-D:
BUZZER
BATTERY STATUS
NORMAL
SHUT-DOWN OVERRIDE
LIGHT ON: SYSTEM POWERED BY BATTERY ONLY
LIGHT BLINKING & BUZZER: LOW BATTERY VOLTAGE (10.6-10.9V DC)
SHUT DOWN IMMINENT.
SHUT DOWN AT 10.3V DC
INPUT:
115/230 VAC + 10%, 50-60 Hz.
-
OUTPUT:
13.8 VDC AT 5 AMPS CONTINUOUS.
20 AMPS INTERMITTENT.
OFF
ON
POWER SYSTEM W/ INTERNAL BATTERY
ON
O
I
OFF
POWER - PAC
TM
5
4
3
6
2
1
6
Front Panel Controls and Indicators
D)
1. On/Off Switch
This rocker switch controls both AC power to the Power-
Pac, as well as DC output. When the switch is in the “Off” position there will be
no output from the supply or the back-up batteries to the load. (Exception: the
back-up batteries will be engaged while the Override button is being depressed,
but will disengage when you release it.) If you wish to engage the back-up
batteries, and leave them engaged while there is no AC available to the Power-
Pac, put the switch into the “On” position and press the Override button once. The
batteries will come “on-line” to begin supplying the load with DC voltage and will
stay on-line until AC power is restored or the batteries drain to the prescribed 10.3
VDC disconnect voltage.
3. “Normal” Indicator Light
This light will stay illuminated as long as the
Power-Pac is on and the battery charging circuit is functioning normally. It will be
extinguished when AC power to the Power-Pac is lost, the unit is manually shut
off or if the unit has shut down due to thermal overload (see item 4).
It may also illuminate when there is a load surge near 20 amps and the back-up
battery is providing a substantial portion of the current. This is indicated if the
Battery Status Light comes on while the AC Indicator and “Normal” lights remain
on.
If the Power-Pac is operated beyond its temperature rating, the automatic
thermal switch may cause the unit to shut down and the back-up battery to be
engaged. In this case, the Battery Status Light will come on while the “Normal”
light is extinguished and the AC Indicator light remains on. The Power-Pac will
return automatically to normal service when a proper operating temperature is
restored, however, the overload problem should be attended to immediately, as
this thermal cycling will severely shorten the life of the Power-Pac.
If the back-up battery is engaged and continues to supply the load until battery
output voltage drops to 10.9-10.6 VDC, the Battery Status Light will begin to
flash. This is to alert the operator that back-up power is very limited and
corrective steps should be taken immediately in order to maintain system
operation.
4. Battery Status Light
This light will illuminate and remain on when AC
power to the Power-Pac is lost and battery back-up is activated. This is indicated
when the light comes on while the AC Indicator and “Normal” lights are
extinguished.
2. AC Indicator Light
This light, located directly above the On/Off switch will
illuminate when there is AC available to the Power-Pac and the switch is in the
“On” position. It is unrelated to DC output.
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