Across The Line Starter
7.9 Across The Line (Full Voltage Starter)
When the Starter Type parameter is set to ATL, the MX
2
is configured to operate an Electro mechanical full voltage or across-the-line
(ATL) starter.
In the ATL configuration, the MX
2
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
2
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
2
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
menu
MX2 CARD
BIPC-300055-01
Figure 43: A Typical ATL Starter Schematic with the MX
2
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