10

SPECIFICATIONS AND OPERATION

SPECIFICATIONS
Rated AC Voltage. . . . . . . . . . . . . 125/250 Volts
Frequency . . . . . . . . . . . . . . . . . . 50/60 Hz
Relay Contacts Rating. . . . . . . . . 125 VAC,20A, 1 HP,768 VA
Pilot Duty
Weight. . . . . . . . . . . . . . . . . . . . . 34 lbs.
SYSTEM OPERATION
When the home standby system is providing power to the
transfer switch,the power management system is
constantly monitoring generator power to control loads.
The power management system monitors both incoming
generator lines and keeps the home standby system loaded
to a maximum of 85-86 percent of rated load.When the
current transformers on any line start to see current reach
85-86 percent of rated load,the power management
system will start shedding loads based on the lowest
priority and work its way to the highest priority.When
current has dropped below 85-86 percent of rated load,
the power management system will start to add loads
based on the highest priority first,followed by the second
highest until the generator reaches 85-86 percent load or
all priorities are back on line.The power management
system will operate this way until the transfer switch
transfers back to utility position.
The power management system waits 5 seconds between
adding or shedding each load to permit the system to
stabilize.When a relay is opened,the relay will stay opened
for a minimum of 5 minutes or until the load can be added
without putting the generator over 85-86 percent of rated
load.If a large load demand is seen, the power management
system will shed loads at a quicker rate of less than
1.5 seconds to prevent the generator from overloading.
Once the demand has stabilized and the loads can be added
again,the power management system will start with the
highest priority,wait 5 seconds and then add the next
priority.The unit will continue to do this until all loads are
added or 85-86 percent of rated load is reached.
When the generator is powering loads,the A/C relays are
open.When one or both of the relays sense 24VAC from
the thermostat(s),the controller will shed loads B1-D2, and
then will allow only one A/C relay to close.A1 has priority
over A2.A2 can close when the signal for A1 has expired.
When the A/C’s are being called to run,all loads are to be
shed before the A/C unit can be added.Should A/C 1 call
while A/C 2 is running,A/C 2 shall open,all relays would
open and then A/C 1 can close.When the A/C relays open,
they are to be locked out for a minimum of 5 minutes or
until they receive a call to start the A/C.
TESTING THE POWERMANAGEMENT SYSTEM
With the generator in “Auto“ position,turn the service
disconnect feeding the transfer switch contactor to the
“Off” position.The generator will start and the transfer
switch will transfer to generator power.
Press the test button on the controle module of the power
management system.As the button is pressed, a relay will
energize.Each time the button is pressed, the previous relay
that was energized,will de-energize and the next relay will
energize.
Press the test button once and relay B2 will energize.Press
the test button again and B2 will de-energize and relay C1
will energize.This will proceed until all relays have been
tested or if the test button has not been pressed for a
period of 30 seconds,the test sequence will halt and the
system will go back to automatic control.
To go back to utility power, turn the service disconnect
feeding the transfer switch contactor to the “On” position.

When Calling the Factory

Before contacting Briggs & Stratton regarding service or
repair of this power management system,obtain the Model
Number and Serial Number from the unit data decal
located on or inside the enclosure.
To contact Briggs & Stratton call 1-800-743-4115,between
8:00AM and 5:00 PM CT.