How it works
A simple and effective solution:
- The original stepwise throttle input (“thumbwheel”) of the Caterpillar-based excavator was read via CAN J1939
- For each step, the MRS module generated the corresponding 4-20 mA signal
- The electric motor was precisely controlled through the frequency inverter, successfully replacing the diesel engine
Division of labour
While the MOBA control units managed the overall system, the MRS Micro PLC stepped in at a critical turning point with a compact yet vital solution, becoming the unsung hero of this electrification journey.
Why the MRS Micro PLC CAN 4 ANA?
The module’s four analog outputs, whose function can be defined individually, cover a current range of 0 to 24 mA, so they are suited to producing the 4-20 mA signal the inverter expects. For the technical specifications see the MRS Micro PLC CAN 4 ANA – Analog Controller page.
Does the MRS Micro PLC CAN 4 ANA only provide current outputs?
No. The I/Os can be used as analog outputs for currents from 0 to 24 mA and voltages from 0 to 10 V; they can also be configured as analog inputs, and two of the four I/Os can be set up as frequency inputs.
What supply voltage does the module use and how is it programmed?
The operating voltage is 9-32 V, it has 1 x CAN interface and it is programmed with MRS Applics Studio.
Related project: CAT 374 NG: From Diesel to Electric, Commissioned Remotely.
Related service: our diesel-to-electric conversion service.
