Despatch LCC1-51-3 - Manual (Page 31)

22
System Control
A Despatch Protocol Plus controller/high-limit device is used to control the unit. This is
located on the control panel of the oven.
•
The Protocol Plus controller provides temperature control for the process.
•
The Protocol Plus controller provides outputs for the cooling fan, door lock
switch/door release pushbutton, and optional beacon light.
•
As many as eight (8) profiles for oven heating cycles are stored in the Protocol
Plus controller. These are accessed by the operator using the Protocol Plus
keypad.
•
The Protocol Plus controls the solenoid valves in an inert atmosphere oven for
purge and maintain operation.
•
Optional MODBUS RS422/485 serial communications hardware may be installed
on the Protocol Plus controller, with a 9-pin communications port located on rear
of oven. This provides the ability to network the oven(s) with a host PC.
•
The optional three-color beacon light provides visual indication of the cycle
status, as follows:
Green – Cycle in process
Yellow – Standby. Operator has unloaded product. Oven waiting for next
cycle.
Red – Error or fault condition.
•
The optional High-Limit Alarm indicates when the high-limit setpoint has been
exceeded. An illuminated Alarm Silence switch lets the operator turn off the
alarm while providing a red warning light until the high-limit condition is corrected.
(See High-Limit description later in this manual.)