/ Ci4000 / Ci5000 Weather-Ometer
®
Service Guide Doc. No. 07-7030-00 Rev. 0
29
5.0 TROUBLESHOOTING PROCEDURES
5.2 Xenon Lamp and Irradiance
Control Malfunctions
5.2.1 Description
Irradiance is provided by the xenon lamp system
which is comprised of the xenon lamp and power
supply components that include the booster
transformer T1, igniter L3, main reactor L1,
auxiliary reactor L2 and wattage regulator AR1.
The has a 4500 watt xenon lamp capable
of operating from 1700 to 4500 watts. The 6500
watt xenon lamp in the Ci4000 is capable of
operating within the range of 2500 to 7400 watts.
The 12,000 watt lamp in the Ci5000 operates within
the range of 4000 to 14000 watts.
The xenon lamp receives its high-voltage ignition
pulse from the igniter, which drops out of the circuit
after the lamp is operating steadily. The instrument
is designed to provide three ignition attempts
before an ignition failure message is displayed on
Data Panel MAIN page 1.
At minimum wattage, the lamp receives its power
from the main reactor only. At higher wattage levels,
the auxiliary reactor and wattage regulator (in
series with the main reactor) contribute additional
power and provide precision wattage control.
Irradiance control is provided by the light monitor
which continuously monitors lamp output and
provides a voltage signal to the PLC. The PLC then
increases or decreases lamp wattage to maintain
a stable irradiance level. Lamp wattage is
continuously monitored by the wattage transducer
A1 which provides a voltage signal to the PLC.
Lamp cooling is provided by the CS-6 lamp cooling
system which pumps filtered D.I. water through the
xenon lamp. Heat is extracted from the cooling
water by a tap water coil in the CS-6 reservoir tank.
In locations where tap water is expensive or its
temperature is too high, an optional LiquiAir unit
or a refrigeration unit may be present to provide
cooling of the lamp water.
Lamp malfunctions can result from numerous
causes. Ignition of the lamp can be prevented by
a damaged or disconnected lamp, a CS-6
malfunction, such as low or lost water flow, or by
the malfunction of a lamp circuit component. Low
lamp irradiance output is often the result of burner
or lamp filter aging, or expired interference filters
in the light monitor. This section focuses on
troubleshooting of the lamp assembly, lamp circuit
components and the light monitor. For CS-6
troubleshooting, refer to Section 5.5.
65000W Xenon Lamp