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94MS42 Rev. B1 S/W Ver 2.06
8) Check capacitors and relay circuit by:
The capacitors and relays are checked by watching the voltage changes
that take place at the different intensity levels. If a capacitor is not in the
circuit the voltage readings on input and output will be the same. If the
capacitor is pulled into the circuit the input and output voltages will be
hundreds of volts apart. Now the tricky part, if a capacitor is pulled into
the circuit the way it is supposed to be then we need to look at the voltage
itself to see if we see an increase in the overall voltage to make sure that
the capacitor is adding voltage to the circuit. If the capacitor is pulled
into the circuit when it is supposed to be but the overall voltage does not
increase then the capacitor is defective.
9) Check voltage from terminal 3 to the capacitor input (orange wire on top
of the capacitors). The voltage should be 700+ V~. If voltage is lower,
check the power path to the tap switch and ballasts. 700+ V~ for the
8kW light sources. If the voltage on a 208/240V~ is low, then not all the
ballasts are being powered properly. This is usually caused by a bad tap
switch or a burnt connector at the tap switch, however any of the wiring
between ballast and tap switch is suspect. If the voltage is zero then a
burnt wire at the power relay or a bad power relay is most likely the
problem. There is a possibility that if there is zero V~ that you might
have a grounded safety interlock circuit.
•
At idle, check voltage from terminal 3 to the capacitor outputs (yellow,
brown, and blue wires on top of the capacitors).
On the following charts find the Wattage of the unit you are working on
and then for the lamp installed into the unit, these are the general voltages
you should read. These voltages are a ball park figure depending upon
several factors and the actual voltage is not as important as to whether or
not the voltages change on the capacitors according to intensity level.
For instance on a 8kW light with an L1280 lamp at low intensity two
capacitors will be about 370V~ and three capacitors will be over 700V~.
Now when you go to medium intensity you should see three capacitors
at about 395V~ and two capacitors at over 700V~. NOTE the number of
capacitors at the lower voltage (i.e. in the circuit) and the voltage increase
from the previous intensity 370V~ at low and 395V~ at medium.
•
At low power, manual expose on, check voltage from terminal 3 to the
capacitor outputs (yellow, brown, and blue wires on top of the capacitors).
•
At medium power, manual expose on, check voltage from terminal 3 to
the capacitor outputs (yellow, brown, and blue wires on top of the
capacitors).
•
At high power, manual expose on, check voltage from terminal 3 to the
capacitor outputs (yellow, brown, and blue wires on top of the capacitors).
• SEE CHART FOR PROPER VOLTAGE READINGS (ALL VOLTAGES
ARE READ TO TERMINAL 3).
14-3
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