55
F O R M
DVR
®
2400 and DVR
®
2500 Digital Voltage Regulator
Installation, Operation and Maintenance Manual
SB0056E
Revised
November 2018
Regal Beloit America, Inc.
100 East Randolph Street
Wausau, WI 54402-8003
www.regalbeloit.com/Brands/
Marathon-Generators
MAINTENANCE AND TROUBLESHOOTING
ELECTRICAL HAZARD
• Failure to connect the voltage regulator in accordance with the
manufacturer’s documentation could result in serious personal injury,
death, and/or property damage.
ELECTRICAL SHOCK HAZARD
• Failure to follow these instructions could result in serious personal
injury, death, and/or property damage.
• Installation and repair of electrical generators and voltage regulators
should be attempted by qualified personnel only. Electrical connections
shall be made by a qualified electrician in accordance with all
local, national, international and/or other applicable codes, rules or
regulations and sound practices.
• Do not touch electrically live parts. Disconnect, lock out and tag prime
mover and input power supplies before installing or servicing voltage
regulator. Use a voltmeter to verify that power is off before contacting
conductors.
• Do not open terminal box or touch unprotected terminals while
the generator shaft is rotating. Shaft rotation produces voltage in
generators even when no excitation is applied. Residual voltage is
present at the generator leads and regulator connections even when
the regulator fuse is removed.
• Ground (earth) the regulator in accordance with local, national,
international and/or other applicable codes, rules or regulations.
EXPLOSION HAZARD
• Beware of arcing when connecting test leads. Arcing could spark an
explosion if exposed to battery gases, fuel vapors or other hazardous
atmospheres. Failure to follow these instructions could result in
serious personal injury, death and/or property damage.
ROTATING PARTS HAZARD
• Keep extremities, hair, jewelry and clothing away from moving parts.
Failure to follow these instructions could result in serious personal
injury, death and/or property damage.
OVERSPEED HAZARD
• Do not exceed the rated speed of the generator. Excessive centrifugal
forces could damage the rotating fields and cause parts to be expelled
at a high rate of speed. Failure to follow these instructions could result
in serious personal injury, death and/or property damage.
DO NOT DISASSEMBLE
• Only qualified personnel who know local, national, international and/or
other applicable codes, rules or regulations and sound practices should
install or repair electric generators and voltage regulators. Failure to
follow these instructions could result in serious personal injury, death
and/or property damage.
MAGNETIC FIELD HAZARD
• Permanent magnet generator (PMG) rotors, when removed from the
stator, expose surrounding personnel and equipment to powerful
magnetic fields which could cause serious health hazards to persons
with pacemakers, hearing aids, or other implanted electronic medical
devices and may impact other electronic devices such as mobile
phones, credit cards, etc.
PREVENTATIVE MAINTENANCE
The only preventive maintenance required on the regulator is to periodi-
cally check that the connections between the regulator and the system
are clean and tight. The only user serviceable parts on the regulator are
the fuse and RTC coincell battery. Regal recommends that no repair pro-
cedures, other than replacing the fuse or coincell battery if needed, be
attempted by anyone other than Regal personnel.
TROUBLESHOOTING
Read and follow all applicable safety instructions. Failure to do so
may result in serious personal injury, death, and/or property damage,
particularly when working with safety barriers removed.
If the output of the generator does not meet specifications, the first level
of troubleshooting is to verify proper generator and regulator connections.
This Installation, Operation and Maintenance Manual of generator should
be referenced.
The following steps should be taken if the generator output is incorrect:
1. Verify meter is operating properly.
2. Check the programmable settings of the regulator are correct.
3. Verify the speed of rotation of the generator is correct.
4. Stop the generator and verify that the wiring of the generator and reg-
ulator is correct and the connections are good and insulated properly.
5. Follow all applicable safety warnings and cautions while per-
forming this test.
Carefully perform a constant excitation test of the generator and
verify the output meets specifications, in accordance with the Instal-
lation, Operation and Maintenance Manual for the generator.
6. Follow all applicable safety warnings and cautions while per-
forming this test.
Verify the output of the PMG (input power of the regulator) is within
specification.
7. Continue with the following troubleshooting flow charts.
