User manual

8 PRG SERIES 400
®
400 AMP DISCONNECT USER MANUAL
Set the Inrush Current Limit:
Some loads, such as incandescent lamps or electric motors, can draw a large surge of current through the Main
Breaker when they are quickly energized with voltage. When the Inrush Current Limit of the Main Breaker is exceeded,
the Breaker will trip within a half cycle of the AC line. It is important that the Inrush Current Limit be properly adjusted
so that these normal, but large surges do not cause nuisance tripping of the Main Breaker.
CAUTION: 1) If the Inrush Current Limit is set too high, the Main Breaker may not respond quickly enough to
a hard fault in the output cables feeding the load resulting in excessive damage to the cables. 2) DO NOT
adjust the Inrush Setting while the unit is under load.
Recommended Settings...
+ For loads consisting mainly of arc lamp power supplies, set the Inrush Limit to its minimum of 2000 Amps.
+ For loads consisting mainly of high wattage incandescent lamps, set the Inrush Limit to 4000 Amps.
+ For mixed loads, try an intermediate setting near 3000 Amps.
Note: It is important to note that this setting applies to INRUSH and not OVERALL amperage. For example, setting
the inrush to 2000 amps does not mean that the switch will now trip at a normal load of 200 amps-per-leg instead of
400 amps-per-leg.
Once the load system is installed, connected and ready to test, "bump" the entire cold load to make sure the Main
Breaker does not trip. If it trips, increase the Inrush setting moderately, then wait 5 minutes for the lamps to cool and
"bump the system again.
Step 1. Set Inrush Current Limit considering the type of load that the Disconnect will be protecting (refer to
guidelines above). The Inrush Current Limit adjustment is located directly below the Main Breaker handle
(Figure 5) and is adjusted by inserting a flat blade screwdriver into the vertical slot of the curved, recessed
control. Moving the control to the left reduces the Main Breaker's tolerance of inrush current and moving it
to the right increases the Main Breaker's tolerance.
Figure 5: Inrush Limit Setting Switch
S-400
MODEL 23-9680-0200
400 AMP DISCONNECT
MAIN CIRCUIT BREAKER IS SUITABLE
FOR CONTINUOUS OPERATION AT
400 AMPERES.
DISJONCTEUR DU CIRCUIT PRINCIPAL
A MOINS QU'IL NE CONVIENNE POUR
SERVICE CONTINU A 400 AMPERES.
RESET BREAKER
POSITION TO
SWITCH TO OFF
SETTING
INRUSH LIMIT
MIXED ARC
LOADS
LOADS LOADS
OFF
3000A2000A 4000A
3ØY/30 A
120/208V
120/208V
Y/30 A
3ØY/30 A
120/208V
208V / 15A
TUNGSTEN
120V / 15A
208V / 20A
MAIN BREAKER
MAIN
ON
TO
TEST
PUSH
BREAKER
XØ VOLTS
ON
400 AMP
YØ VOLTS ZØ VOLTS
INPUT VOLTAGES
VOLTAGES
TEST POINT
XØ
FOR BRANCH CIRCUIT USE ONLY
XØ AMPSNEUT AMPS
Ø -N
NEUTRALGROUND
AGC1
YØ
YØ AMPS
OUTPUT
ZØ
1A / 250V
FUSES
ZØ AMPS
600A MAX
Ø -Ø
400A MAX
4000A
2000A
3000A
INRUSH LIMIT
SETTING
ARC
LOADS
TUNGSTEN MIXED
LOADS LOADS