Despatch LCC/LCD2-14-3 Non Pass Through Series - Manual (Page 24)

15
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. See the section on the Protocol Plus controller
for detailed operation.
The Protocol Plus controller provides temperature control for the process.
The Protocol Plus controller provides outputs for the cooling/exhaust fan, End of
Cycle/door lock, and purge and maintain operation for inert atmosphere. The
control relays are set up on standard models as follows
o RLY1 = EV1 (Exhaust/Cooling event)
o RLY2 = CYCL (End of Cycle/Door Lock)
o RLY3 = EV3 (Nitrogen Purge) If option purchased
o RLY4 = EV4 (Nitrogen Maintain) If option purchased
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 front
of the 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 push-button lets the operator turn off
the alarm while providing a red warning light until the high-limit condition is
corrected.