Bird Technologies 8890-320 Series - Manual (Page 23)

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Chapter 5 Operating Instructions, With Blower
Blower Controls
Bird 8890 series –310 and –320 Loads are equipped with a control switch and indicator light on the front of the
blower assembly. The switch is labelled MANUAL/AUTOMATIC.
•
When the switch is set to MANUAL, the fans run continuously.
•
When set to AUTOMATIC, the fans turn on when the coolant reaches a preset temperature.
Note: The indicator light, labeled BLOWER ON, turns on whenever the unit is connected to AC power.
Normal Operation
1. Ensure the indicator light is on.
2. Set the switch to MANUAL for a few moments.
3. Ensure the fans are working properly.
4. Set the switch back to AUTOMATIC.
5. Apply RF power.
Operating Under Abnormal Conditions
The load can be subjected to higher power levels for short intervals. If this is likely, make sure the interlock is properly con-
nected to prevent damage to the load.
Note: A properly connected interlock will prevent overload.
If the indicator light turns off or the fans stop unexpectedly, do one of the following:
•
Immediately turn off RF power.
•
Reduce the RF power to less than 1,250 W.
Note: Refer to "Troubleshooting" on page 13 to correct the problem.
Shutting Down the Load
1. Turn off RF power at the source.
2. Wait approximately 15 minutes, or for the fans to stop running.
Note: This will allow the load to cool without causing heat stress.
3. Turn off the blower.
Emergency Shutdown
Turn off RF power at the source.
Note: If the interlock thermoswitch is properly connected, RF power will be automatically turned off when
the coolant temperature reaches an unsafe level.
CAUTION
Maximum power is 1,250 W when the blower is not running. If the indicator light should turn off, immediately
reduce RF power to less than 1,250 W.
WARNING
Never attempt to connect or disconnect RF equipment from the transmission line while RF power is being
applied. Leaking RF energy is a potential health hazard.