Building Automation

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Small PLC & HMI Panelbuilding Services


This Panel build project was done for one of our long lasting customers, ACTOM HVAC. The Unitronics V350 touch screen and PLC controls the air-coditioning units at a factory in Somerset West, Cape Town.

All software was done by the customer himself and we are still building multiples of these panels for them.


Dust Extracting


In the manufacturing of pharmaceuticals an important factor is clean air. To achieve this ACTOM HVAC contacted HmT to help with a controller for their filtration.

The system was controlled by an Allen Bradley Micro830; the controller checked when a call button is pressed. The controller then supplies air to the area where the button is pressed by opening appropriate valves. Another function of the controller is to regulate fan speed; this is done by measuring the pressure in the vents.

Light Control System


HmT Mechatronics was subcontracted by Faradays Electrical to do the design and implementation of the Light Control System for the clothing retailer H&M’s Sandton store. The implementation was done according to Triocon Consulting Engineers‘ electrical specification and H&M functional requirements.

Two LSis XEC PLC’s are used in order to control the Lights on each floor. One PLC acts as the master and automatically controls the lights according to defined time settings and external inputs. The time settings are programmed with a LSis XP40 HMI. A manual override function is incorporated and the lights may be individually switched on/off from the HMI.


Revolving Sign


HmT Mechatronics partnered with Petrel Engineering (mechanical engineering company based in Cape Town and Durban) to design & produce two advertising units that would rotate and stop at four different positions (90deg apart), each displaying a different advertisement. The dwell time for each advert on display, along with rotational speed, needed to be adjustable by the operator. The unit must also be able to supply power to the advertising board’s LEDs to make night time visibility possible. When any given side had no advertisement present, the option to bypass any “zone” by selection had to be possible.

To solve this problem, we incorporated a 0.25kW three-phase motor in conjunction with a inline bevel gearbox and VSD to turn the unit. A timer/counter was used alongside proximity sensors to detect its current position. The latter enabled the user to set the rotational speed as well as displaying dwell time intervals.