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94MS41 Rev C1 S/W Ver. 2.06
Lamp Head Signals
Signals at the Terminal Strip (Cable to the Lamp Head)
A great deal of information about the operation of the lamp may be found
at the terminal strip, in the power supply that connects to the lamp head.
The terminals are counted number 1 at the end where the cable begins,
and wire number 18 is the last wire. Terminal number 1 is closest to the
dividing wall in the power supply.
Terminal#
# 1
# 2
# 3
# 4
# 5
# 6
# 7
# 8
# 9
# 1 0
#11
# 1 2
# 1 3
# 1 4
•
#1
The ground terminal is for safety purposes and carries no current.
•
#2#3 Lamp terminals 2 and 3 carry the power to the lamp. If the lamp
is hot or fails to start, the voltage should be 600 to 950V~. During this
time, there are voltage pulses that may damage a sensitive voltmeter.
Immediately after the lamp strikes, the voltage will drop as low as 20V~,
then rise as the lamp warms to the operating voltage, between 180 and
240V~.
•
#4
V~ common terminal is the V~ return for the lamp fans, the shutter
motor, and the interlock switch. On 120V~ equipment, this is the V~
common from the power line. This potential is generated on 208/240V~
equipment and may be 60V~ from the line common.
•
#5
The voltage applied to the lamp fan varies as cooling is required.
The voltage is measured referenced to terminal 4 and terminal 5. This
voltage starts at 0V~ during unit warm-up and when the lamp temperature
rises it increases. As the lamp reaches temperature, the fans speed
increases to regulate the lamp. At idle, this voltage is typically 45 - 90V~
Descrip tio n
G round to lamp head
Lamp
Lamp
V ~ c o m m o n
Lamp fans
Shutter motor
Shutter position switch
N o t currently used
Shutter position switch
Interlo c k a nd thermostat switching
N o t currently used
Inc o m ing vo ltage
Autofo rmer
Inc o m ing vo ltage
13-15
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