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Section 5 Scheduled Maintenance
Grounding the transfer switch. Hazardous voltage can
cause severe injury or death.
Electrocution is possible
whenever electricity is present. Open main circuit breakers of
all power sources before servicing equipment. Configure the
installation to electrically ground the transfer switch and
related equipment and electrical circuits to comply with
applicable codes and standards. Never contact electrical
leads or appliances when standing in water or on wet ground,
as the chance of electrocution increases under such
conditions.
Servicing the transfer switch. Hazardous voltage can
cause severe injury or death.
Deenergize all power sources
before servicing. Open the main circuit breakers of all transfer
switch power sources and disable all generator sets as
follows: (1) Move all generator set master controller switches
to the OFF position.
(2) Disconnect power to all battery
chargers. (3) Disconnect all battery cables, negative (--) leads
first. Reconnect negative (--) leads last when reconnecting the
battery cables after servicing. Follow these precautions to
prevent the starting of generator sets by an automatic transfer
switch, remote start/stop switch, or engine start command
from a remote computer. Before servicing any components
inside the enclosure: (1) Remove all jewelry. (2) Stand on a
dry, approved electrically insulated mat. (3) Test circuits with a
voltmeter to verify that they are deenergized.
Short circuits.
Hazardous voltage/current can cause
severe injury or death.
Short circuits can cause bodily injury
and/or equipment damage
.
Do not contact electrical
connections with tools or jewelry while making adjustments or
repairs. Remove all jewelry before servicing the equipment.
NOTICE
When replacing hardware, do not substitute with inferior
grade hardware.
Screws and nuts are available in different
hardness ratings. To indicate hardness, American Standard
hardware uses a series of markings, and metric hardware
uses a numeric system. Check the markings on the bolt heads
and nuts for identification.
NOTICE
Hardware damage.
The transfer switch may use both
American Standard and metric hardware. Use the correct size
tools to prevent rounding of the bolt heads and nuts.
NOTICE
Electrostatic discharge damage.
Electrostatic discharge
(ESD)
damages
electronic
circuit
boards.
Prevent
electrostatic discharge damage by wearing an approved
grounding wrist strap when handling electronic circuit boards
or integrated circuits. An approved grounding wrist strap
provides a high resistance (about 1 megohm),
not a direct
short
, to ground
.
5.2 Testing
5.2.1
Weekly Generator Set Exercise
Use the exerciser or a manual test to start and run the
generator set under load once a week to maximize the
reliability of the emergency power system. Press the
Test button on the controller front panel to start and end
the test. The Test LED flashes during a test with load or
lights steadily during a test without load. Use the DIP
switch to set the system for a loaded test or use a load
bank and the load bank control output to run loaded
without transferring the building load.
See Sections
4.2.2 and 4.2.3 for more information about the exercise
and test functions.
5.2.2
Monthly Automatic Control
System Test
Test the transfer switch’s automatic control system
monthly. See Section 3.7.3 for the test procedure.
D
Verify that the expected sequence of operations
occurs as the switch transfers the load to the
emergency source when a preferred source failure
occurs or is simulated.
D
Observe the indicator LEDs included on the transfer
switch to check their operation.
D
Watch and listen for signs of excessive noise or
vibration during operation.
D
After the switch transfers the load to the standby
source, end the test and verify that the expected
sequence of operations occurs as the transfer switch
retransfers to the preferred source and signals the
generator set to shut down after a cooldown period.
D
On programmed-transition units, verify that the time
delay in the OFF position functions during transfer to
the standby source and transfer back to the preferred
source.
5.3 Inspection and Service
Contact an authorized distributor/dealer to inspect and
service the transfer switch annually and also when any
wear, damage, deterioration, or malfunction of the
transfer switch or its components is evident or
suspected.
5.3.1
General Inspection
External Inspection.
Keep the transfer switch clean
and in good condition by performing a weekly general
external inspection of the transfer switch for any
condition of vibration, leakage, excessive temperature,
contamination,
or
deterioration.
Remove
accumulations of dirt, dust, and other contaminants
from the transfer switch’s external components or
enclosure with a vacuum cleaner or by wiping with a dry
cloth or brush.
