Tuttnauer 2301006, Руководство по эксплуатации и техническому обслуживанию, Страница: 17 / 122

Page 12 of 117 pages
2.6 The Electric System
The electric system of the autoclave comprises of the power circuits, including the
commands, switching and protective components, required for the operation of the
electric equipment of the machine.
The following parts are located in the electric box, mounted on the side of the
autoclave.
♦
The solid state relays for the command of the heaters, water pump and
ejector.
♦
The circuit breakers for protection of all power circuits.
♦
The power supply for powering of electronic circuitry and solenoid
valves.
♦
Two protective relays.
♦
The wiring and connection elements.
♦
The main switch.
The power circuits of the steam generator and the vacuum system are connected
to the terminals in the electric box at a one-phase voltage, 1x 115V\60Hz.
It is important to achieve a steadfast grounding screw connection to the
metal-sheet enclosure of the electric box and metal parts of the autoclave.
The earth installation at the customer’s site must be built in compliance with the
laws and regulations in force and International EN 61010-1 electrical safety
standards and certified by the competent authorities.
Description of the Electrical Equipment
The command signal for the contactor is output by the micro-controller through a
solid state relay. The water pump of the generator is driven by the solid state relay,
the command signals are output by the micro-controller system.
The command circuits are energized by a power supply with four outputs, as
indicated below:
♦
5 VDC for the digital circuits.
♦
+12VDC and – 12VDC for the analog circuits
♦
24 VDC for the solenoid valves.
The coils of the solenoid valves are connected with an end at +24V and with the
other end to the control output of the controller.
The command is active; i.e. the solenoid valve is actuated when the control
voltage output is low (less than 2V) with respect to ground.
Circuit breakers attain the protection of the electric and electronic circuits operated
in direct current and current limiting circuits, inside the power supply stabilizers.
Two protective relays are designed to stop the pump operation in case of
interruption of the other phases and save the important data from the RAM
memory in case of power failure.