Interlocks; Lamp - Christie CP4230 Service Manual

1.4

Interlocks

The projector has a number of sensor and switches that detect when safety critical components of the projector
fail. Many of these are linked into an interlock circuit so that if there is a malfunction or an error condition the
projector's lamp power supply (LPS) is turned OFF or unable to be turned ON if already powered OFF.
Table 1.1 Safety Interlock
Name
Lamp Door
Lamp Exhaust
Lamp Blower
Fire Alarm (Optional)
There are a number of sensors used to indicate the projector is operating under stress and may soon shutdown.
These warning sensors are not wired into the interlock circuit since they do not monitor safety critical areas of
the projector.
Table 1.2 Fan, Temperature and Pump Sensors
Name
Cooling Fans
Temperature Sensors
Pump
1.5

Lamp

The Xenon arc lamp resides in the rear left hand side of the projector. Replacing a lamp requires the high-
security key for unlocking the lamp door. The lamp is mounted so that its rear (cathode) end is free to move via
an automatic adjustment mechanism, but its front (anode) end is stable. The front end of the lamp rests in a
supporting "cradle" or yoke, which can be located approximately 1" forward or back to accommodate longer
(4.5kW and 6.0kW CDXL) versus shorter (2.0kW and 30kW CDXL) lamps. An anode clamp secured to the
CP4230 Service Manual
020-100622-04 Rev. 1 (05-2016)
The lamp door interlock prevents the lamp from being ignited when the lamp
door is open.
This sensor is mounted inside the exhaust duct to monitor the airflow velocity.
If airflow is not detected, the lamp will not ignite or remain ON.
This sensor is located at the blower inlet to monitor airflow velocity from the
blower before the air reaches the lamp or reflector. If airflow is not detected,
the lamp will not ignite or remain ON.
The fire alarm interlock is an externally accessible interlock for connection to
the facilities fire alarm system. Connect this terminal to the theater's fire alarm
system, as required by local fire safety codes. A jumper is provided to close this
connection by default. When connecting to the fire alarm system use a relay to
short the connector when the fire alarm system is OFF and to open the connec-
tor when the fire alarm system is triggered. An open connector turns the lamp
OFF and generates an alarm, which is displayed on the TPC.
The tachometer of each fan is monitored by the Environmental Board (EVB) to
ensure it is turning at a minimum RPM. If any of the fans slow below a preset
threshold the TPC will report a warning.
Temperatures of each DMD, integrator, prism, filtered air intake, cardcage
exhaust and lamp exhaust are tracked to ensure the projector is functioning nor-
mally. Only a severe over-temperature reading on the DMDs will result in an
automatic shutdown.
If the pump speed falls below a preset threshold the TPC will report a warning.
Section 1: Introduction
Description
Description
1-5