Electricity + Control July 2015

JWT66568 www.powertech.co.za For more info contact us on (011) 706 7184 or e-mail: info@powertech.co.za Power brings dreams to life and turns opportunity into reality.Wherever there is electricity, there’s a human being who’s empowered in some way, and that’s what we at Powertech strive for. A subsidiary of the Altron Group, we are one of Southern Africa’s leading manufacturers of electrical and electronic equipment. Our wide range of products and systems integration skills provide a total design, manufacture, supply, and installation solution. MAKING POWER PERFORM

Protection and control for three

phase LV motors

The modular MA electronic motor protection relay from

NewElec

, controls, monitors and protects the performance

of 3-phase LV motors.The relay measures electrical motor

variables such as current, phase unbalances, phase loss,

earth leakage, earth fault, short circuit and voltage condi-

tions. It can be used as either a standalone electronic motor

protection relay or as

part of an automated

process communi-

cating to a PLC. De-

signed for advanced

motor protection, the

MA comes complete

with integrated cur-

rent transformers and

earth leakage core in the range from 0,5 to 250A.The current

range can be extended using interposing CTs. Individual

fault status indication is provided by LEDs for easy diag-

nostics. It also stores the last four faults with time and date

stamping. The relay has five digital inputs and four output

contacts (two are programmable).The inputs will accommo-

date voltages from 24 to 220 Vac or dc, and for this reason,

it is an ideal choice for rapidly automating older plants

utilising the customer’s existing switchgear and optimising

the electrician’s circuit knowledge.

Enquiries: Email

sales@newelec.co.za

Soft starter for electric motors

TELE

has introduced a new 3PH soft starter with true 3 ph

control and integrated current control for a nominal motor

power 2,2 kW up to 22 kW. The unit is thyristor based and

integrates current measurement and current limiting without

external components and wiring.This function controls and

limits exactly the maximum motor current that is used to

start the whole system without overloading the motor and

drive mechanics. Additional power peaks and flickers in the

mains are reduced to a minimum, so the stability of the sup-

ply is much higher compared to star/delta or direct motor

starters. The overall size of the new MS3 is very compact

and saves space in the cabinet.The fan-less design improves

time between maintenance.

Asynchronous motors are the most common drive type

in machinery, automation, HVAC, pumps and transport busi-

ness. Direct starting these types of motors causes a high

inrush current, mechanical stress and destabilisation of the

mains. Using soft starters to

start the motor, eliminates or

at least minimises those dis-

advantages and guarantees a

long lasting and low mainte-

nance operation system.

Enquiries:Tel

. 011 454 8053 or

email

edwin@vepac.co.za

DRIVES, MOTORS + SWITCHGEAR