4.2 The Controller Cabinet
The power supply to the control cabinet is via a strain-relief mounted cable
and plug, and it may be wired in Star or Delta configuration. Please check
your specifications for details on which style has been configured. There are
normally two types of cables supplied: a thermocouple connection and a
power connection, both using type HAN24E as a preferred connector.
Refer to "Section 9 - Wiring of Hot Runner Controller" for more information.
An alarm output option is available for extending the alarm or inhibiting the
injection process.
4.3 Controller Modules
The controller uses six-zone modules that provide real time temperature
control.
Each card has three main components:
• thermocouple input CPU
• two control CPUs
• multi-voltage output triacs
4.4 Thermocouple Inputs
The thermocouple inputs have preset responses for both J and K- type
thermocouples. The associated console provides means of selecting the
sensor type which, in turn, sets the CPU linearization to match the selected
thermocouple type.
4.5 Central Processor Units (CPUs)
The CPU provides the following facilities:
• closed and open loop control of the zones
• processes thermocouple and current readings to show on display
• checks for alarm conditions, including excess current, incorrect
thermocouple wiring, zone over temperature condition, low impedance
between heater and ground, and generates alarm information for the
display screen and alarm relay
• controls the output power to the on-board triac using a number of self-
tuning algorithms
The card requires no analogue calibration and is ready for use once set up
from the display console.
4.6 Output Triacs
The controller card has six on-board triacs, one for each channel that are
capable of controlling heating loads of up to 15 Amps peak.
4.7 Power Supply
The DC power supplies for the cards, data communications and an alarm
output relay are all provided by a single power supply unit. This is located on
top of the upper chassis panel.
4-2
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OVERVIEW
Me6 & Me12 Controller User Manual
