Magnum MMG75CAN6, Operating Manual

Page: 35 / 52

35
When the generator is used as a standby power supply, it must be equipped with a transfer switch which isolates it
from the utility’s distribution system. A transfer switch is designed to transfer electrical loads from the normal power
source (utility) to the emergency power source (generator) when normal voltage falls below a prescribed level. The
transfer switch automatically returns the load back to the normal source when power is restored back to operating
levels.
DANGER
FAILURE TO ISOLATE THE GENERATOR FROM THE NORMAL POWER UTILITY CAN
CAUSE POTENTIALLY LETHAL VOLTAGE TO BACKFEED INTO THE UTILITY LINES.
THIS MAY RESULT IN INJURY OR ELECTROCUTION OF UTILITY WORKERS NEARBY.
MAKE SURE THE GENERATOR IS ISOLATED BY A TRANSFER SWITCH FROM ANY
LOCAL UTILITY LINES. THIS ALSO APPLIES IF THE GENERATOR IS BEING USED AS
A BACKUP TO SOME OTHER TYPE OF POWER SUPPLY.
Installation of a transfer switch or other type of remote starting device is the responsibility of the generator user.
Installation of such devices must be performed by following all directions supplied by the manufacturer of the switch.
If attaching the generator to a power supply normally serviced by a utility company, notify the utility company and
check local and state regulations. Familiarize yourself with all instructions and warning labels supplied with the switch.
WARNING
ONLY a licensed electrician should perform wiring and related connections to the
generator. Installation should be in compliance of the National Electric Code (NEC)
as well as any state or local codes or regulations. Failure to follow these procedures
could result in property damage, personal injury or death. Before any connections
are attempted, make sure the main circuit breaker and the engine start switch are in
the “OFF/O” position and that the negative (-) battery cable has been disconnected
from the engine starting battery.
When using the generator as a standby or substitute power supply, make sure the output
voltage and phase rotation of the generator match those of the local power utility. Improper
voltage or phase rotation may cause equipment damage or malfunction.
AUTO EXERCISE TIMER
Generators installed in a standby application should be exercised regularly to maintain operating condition and to
ensure responsiveness in an emergency situation. The following procedure demostrates how to run (exercise) the
generator on a time schedule:
1. Press the “PAGE SELECT” button until “Password” appears at the top of the screen.
2. Press the down arrow “
 ” button until “Date/Time” is selected and press “ENTER.”
3. Press the down arrow “  ” button until “Timer1 Repeat” is selected and press “ENTER.”
Incoming
Utility
Power
WHITE = Incoming
Utility Power
GRAY = Normal Utility
Power Circuit
BLACK = Emergency
Generator Power Circuit
Utility
Meter
Transfer
Switch
Main Distribution
Panel
(Utility Power)
Emergency
Distribution Panel
(Generator Power)
Power From
Generator