Technical information

6 – APPLICATIONS
Across The Line Starter
94
6.2.4 Across The Line (Full Voltage Starter)
When the Starter Type parameter is set to ATL, the MX is configured to operate an electromechanical full voltage or across-the-line
(ATL) starter.
In the ATL configuration, the MX assumes that the motor contactor (1M) is directly controlled by a digital output relay that is
programmed for the RUN function. Therefore, when a start command is given, the RUN programmed relay energizes the motor
contactor, which applies power to the motor. When the MX has determined that the motor has reached 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.
Figure 13 – A typical ATL Starter Schematic with the MX
1M
L1 L2 L3
1M
Control Power
Run
MX
1M MX
DIN#2
Input
DIN#2
Common
MOTOR
T1 T3
T2
To TB3, C1+ (White Wire)
To TB3, C2+ (White Wire)
To TB3, C3+ (White Wire)
To TB3, C1- (Black Wire)
To TB3, C2- (Black Wire)
To TB3, C3- (Black Wire)
Current Feedbacks
to MX control
To TB4 (SCR 1) K1
To TB6 (SCR 2) K2 To TB8 (SCR 3) K3
Line Voltage
& Frequency
to MX
Note: When in ATL mode, the acceleration ramp, kick, and deceleration parameter settings have no effect on motor operation.
Note: When in ATL mode, the SCR gate outputs are disabled.