Rockwell-automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE Manual do Utilizador descarregar pdf (Página 102)

4-20

Application Profiles for the SMC Dialog Plus Controller

Figure 4.19 Centrifuge with Current Limit Start

Problem: Because of the high starting torque, the gearbox to a

centrifuge was being damaged. A reduced voltage starter

was desired because this motor was near the end of the

distribution line. In addition, the incoming power was

unbalanced. A controller with a circuit breaker

combination enclosure was needed. When the enclosur

door was open, the controller’s circuit boards could not

be exposed.

Solution: The SMC Dialog Plus controller was installed. It was

programmed for a 27-second, 300% current limit start,

which limited the starting torque of the motor and the

shock to the gearbox on start-up. The Energy Saver

feature reduced the voltage to the motor when it was

running lightly loaded. The SMC Dialog Plus controller

was ordered as a combination controller with a circuit

breaker. The SMC Dialog Plus controller has no exposed

circuit boards, fulfilling the packaging requirements.

480 Volts

250 HP

Centrifuge

Gearbox Motor

1 2 ... 97 98 99 100 101 102 103 104 105 106 107 ... 201 202

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Rockwell-automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE Manual do Utilizador Página 102