bonitron M3460UC, Customer Reference Manual

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M3460
34
typically is in a standby mode waiting for a power disturbance, and by design
has 50% more capacitance than needed.
The capacitors are rated for 11 years MTBF if ambient temp is 50°C, capacitors
are held at 100% rated voltage, and caps run full ripple current at 1% duty.
With typical operating conditions of 35°C, caps running at 75% rated voltage,
and a duty cycle of one event per month, Bonitron recommends the capacitors
be checked or replaced after 20 years.
The recommended test is to measure the voltage across each series set of
capacitors. Any voltage difference greater than 15% between each set of
series caps would indicate a change in value in one cap and would constitute
a more detailed out of circuit capacitance check. (A difference of 5% is allowed
at time of production.)
Testing the capacitors in the unit requires trained personnel and should only
be attempted observing appropriate safety and arc-flash precautions when
working on live high voltage equipment.
DANGER!
•
H
IGH VOLTAGES ARE PRESENT
!
•
N
EVER ATTEMPT TO OPERATE THIS PRODUCT WITH THE ENCLOSURE COVER
REMOVED
!
•
N
EVER ATTEMPT TO SERVICE THIS PRODUCT WITHOUT FIRST DISCONNECTING
POWER TO AND FROM THE UNIT
.
•
A
LWAYS ALLOW ADEQUATE TIME FOR RESIDUAL VOLTAGES TO DRAIN BEFORE
OPENING THE ENCLOSURE
.
•
FAILURE TO HEED THESE WARNINGS MAY RESULT IN SERIOUS
INJURY OR DEATH!