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Across The Line Starter

7.9 Across The Line (Full Voltage Starter)

When the Starter Type parameter is set to ATL, the MX

is configured to operate an Electro mechanical full voltage or across-the-line

(ATL) starter.

In the ATL configuration, the MX

assumes that the motor contactor (1M) is directly controlled by an output relay that is programmed to

RUN. Therefore, when a start command is given, the RUN programmed relay energizes the motor contactor, which applies power to the

motor. When the MX

determines that the motor is at full speed, the up-to-speed (UTS) condition is indicated by energizing the UTS

programmed relays. When configured as an ATL starter, all MX

motor and starter protective functions, except bad SCR detection and

power stack overload, are available to provide full motor and starter protection.

z NOTE: When in ATL mode, the acceleration ramp, kick, and deceleration parameter settings have no effect on motor operation.

z NOTE: When in ATL mode, the SCR gate outputs are disabled.

163

7 - THEORY OF OPERATION

START

Starters

stop

reset

enter

MX2 CARD

BIPC-300055-01

Figure 43: A Typical ATL Starter Schematic with the MX

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