Eurotherm Mini8 Controller Integration Guide

Logical output (DO8): An external 24V power supply is required, and this power supply must be isolated from the system power supply to maintain 42V isolation between the channel and the system. The total current shall not exceed 200mA.

CT3 input: 0-50mA signal from current transformer, no external power supply required, but the CT secondary side should not be open circuited.

6.2 Grounding and Protection

If using RL8 module, the protective grounding terminal (PE) must be connected to the system grounding point.

Communication cables should use shielded twisted pair cables and be grounded at one end.

It is recommended to install a filter at the power input end to prevent conducted interference.

6.3 Daily maintenance and troubleshooting

Possible causes and countermeasures for the phenomenon

Controller no response, P LED power failure or overload check 24V input voltage, measure if power consumption exceeds 15W. Remove some modules for testing.

Abnormal PV display in a certain circuit (e.g. -999), sensor disconnection inspection, TC/RTD wiring; If it is a TC input, when the sensor is disconnected, the PV should display over range (not specified in the data manual, but can be configured to select up/down drive).

Heater malfunction alarm false positive CT ratio setting error, or current waveform distortion check CT parameters, use true effective value table to measure actual current. Adjust the alarm threshold.

Communication timeout, NET LED red bus address duplication, cable breakage, or terminal resistance not set. For Profibus, check the uniqueness of the address and confirm that the terminal resistance at both ends of the bus is ON.

Unable to connect iTools configuration port due to wiring error or missing driver program. Use SUB21/IV100 adapter (RS232 to 5-pin plug) to connect to PC and confirm COM port.

The configuration cannot be saved or lost. The internal supercapacitor is depleted (the storage parameters are saved in Flash and should not be lost). Please download the configuration again. If it repeatedly occurs, contact technical support.

Ordering and Selection Guide

The ordering code for Mini8 consists of multiple options, and engineers need to confirm each one:

Product series: MINI8

Temperature unit: C (Celsius) or F (Fahrenheit)

Number of wires (terminals): 30/60/120/250 (number of user connections, selected based on the number of I/O points)

Number of control loops: ACQ (acquisition only, no PID), 4LP, 8LP, 16LP

I/O modules (slots 1, 2, 3, 4): Fill in module codes by location (such as TC8, TC8, XXX, AO8)

Program (Set value programming): OPRG (none), 1PRG (1 program, 50 segments), XPRG (multiple programs, 50 segments)

Power supply: VL (24V DC)

Application pre configuration: STD (standard), EC8 (8-loop extrusion), FC8 (8-loop furnace)

Formula: NONE or RCP

Calibration certificates: NONE, CERT1 (compliance), CERT2 (5-point calibration per channel)

Special option: EU0725 (OEM safety)

Configuration software: ENG (English DVD), or ITOOLS download

Attention: EC8 pre configuration requires 8 control loops and specifies TC8 (slot 1), CT3 or XXX (slot 2), DO8 (slot 3), DO8 (slot 4). FC8 requires TC8 (slot 1), XXX (slot 2), XXX (slot 3), and AO8 (slot 4).

Recommended attachments:

SUB21/IV100: RS232 configuration clip, used to connect iTools

Corresponding model of current transformer (10A/25A/50A/100A)

HA031260: Engineering Tool Kit DVD