Precision Control Systems 930 - Manual (Page 14)

Model 930 ControlIR TM Instruction Manual Operating Instructions
Research, Inc. Page 10 of 25
CONTROLS AND
INDICATORS
Main Disconnect Switch
Heater ON/OFF Switch
Cooling ON/OFF Switch
Heater On Indicator
Cooling On Indicator
Heater Over Temperature
Indicator
Lamp-Out, OCT / SCR
Indicator
Operating Instructions
Figure 4-1 shows the location of the controls and indicators.
The main disconnect switch turn on and off the power control system. Note the
following:
Before turning on the disconnect switch, check the following:
1. The load is wired and ready for power to be applied to it.
2. All safety precautions are observed.
The Heater ON/OFF switch allows the operator to enable or disable the power going to
the load. This is accomplished by removing power from the AC contactor. This in
turn removes power from the SCR controller. The cooling on indicator must be on
before the heater power can be turned on.
The Cooling ON/OFF switch allows the operator to turn on or off the heater cooling.
• Indicator light on steady indicates power is applied to the heater power controller.
• Indicator light flashing indicates that the Remote Interlock is open and heater
power can not be applied.
• Indicator light on steady indicates adequate cooling flow.
• Indicator light flashing indicates that the cooling is in a one minute shutoff delay
cycle. The one minute delay cycle is activated any time that the heater power
contactor is opened, after the initial heater on cycle is activated.
• Indicator light on steady indicates a heater over temperature condition. A heater
over temperature condition will open the heater power contactor, removing power
from the heater.
• Indicator light flashing indicates a process over temperature alarm. This feature
is available only if the Temperature Control Option is installed. The indicator
will flash only as long as the process alarm exists.
• Indicator light on steady indicates a power controller over current (OCT) or a
power controller shorted scr (SCR) condition exists. The OCT / SCR alarm will
open the heater contactor, removing power from the load.
• Indicator light flashing indicates a lamp out condition. This feature is available
only if the lamp out (LL) option is installed. The alarm will remain on as long as
the lamp out condition exists.