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4.1. System Control—In General
• The Protocol 3 controller provides outputs for the cooling fan, door lock
switch/door release pushbutton, and optional beacon light.
• A number of profiles for oven heating cycles are stored in the Protocol 3
controller. Access profiles using the Protocol 3 keypad.
• The Protocol 3 controls the solenoid valves in an inert atmosphere oven for
purge, maintain and water-cooling operation.
• The Protocol 3 can also be operated remotely with a PC running Protocol
Manager Software.
4.2. High-Limit Function
The Protocol 3 controller has an integrated high limit function which disables the
heater output when tripped. The High-Limit temperature is displayed as HLPV
(Manual Mode only).
If the high limit trips, the Hi-Limit indicator will light, and the relay must be
manually reset. Allow the oven to cool several degrees below the set point (or
increase the high limit set point) and then press . The indicator will turn off.
4.3. Outputs
The Protocol 3 controller comes standard with an output signal that can transmit
temperature data, setpoint data or control power to a user-supplied recording
device. Output relays (five) can also signal user-specified events or alarm to
external devices (Figure 2 and Figure 3).
• Heating output: The control output is a DC voltage open-collector output
which is time-proportioned and designed to control a heat control device such
as a solid-state relay.
• High limit: The high limit output is a SPDT relay which is energized under
normal operating conditions. If the control senses a temperature higher than
the high limit setpoint, or if there is a sensor error, the high limit relay will
de-energize until the condition is cleared and Reset is pressed. When the high
limit relay is de-energized, the heater is disabled.
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