4 Electrical and Controls
4.1 General
This proposal allows for the carton tunnel to be completely wired for the following:
• All proximity and infra-red sensors
• All fans and hydraulic pump units
• All hydraulic solenoid valves
• Refrigeration control solenoid valves and thermostats
• Defrost water valve interlock
• Milmeq supplied conveying systems
The wiring installation for all electrical services will be back to a motor control centre, and the MCC offered is of a type “Form Two” and located within 10 metres of the freezer.
Cabling
All motors will be wired with neutral screen cables and control cables in multi-core PVC.
Cables will generally be run on galvanised cable tray or in trunking or conduit as dictated by site conditions. All cables shall be glanded at both ends and the wiring shall be in accordance with the local Wiring Regulations.
Switches
Both proximity and PE switches will be used within the freezer. The proximity switched used will be Omron EZE-X10F1 and the limit switches will be Allen Bradley, which are guaranteed to operate to -40oC. Photo electric switches will be Allen Bradley 6000 and 9000 Series.