Production Description

The standard ATL starter configuration of the MotorSeT MV ATL Motor Controller is a direct-on-line starter designed for starting three-phase induction motors utilizing vacuum contactors. This base model of the motor starter consists of the following sections:

• Isolation section

• Medium voltage section

• Low voltage section

A typical MotorSeT MV ATL Motor Controller assembly is shown in the figure Typical Views — Standard ATL Motor Controller.

Typical Views — Standard ATL Motor Controller

The compact ATL starter configuration is a standard motor starter in a narrow enclosure for simple applications with limited space. In addition, with the compact ATL motor starter note the following:

• Not all standard ATL options are available with the compact ATL motor starter.

• The maximum mains/line voltage is 4160 Vac.

• The disconnector switch is rated 600 A, 4.76 kV.

• The top cable exit is only available with the 36 in. (914 mm) depth enclosure.

A typical view of the MotorSeT compact ATL motor controller assembly is shown in the figure Typical View — Compact ATL Motor Controller.

Typical View — Compact ATL Motor Controller

The MotorSeT dual ATL motor starter configuration consists of two motor starters, two feeders, or a motor starter and a feeder. This configuration minimizes the cabinet space requirement for applications with space constraints.

• The maximum fuse rating for the motor starter is 24R fuses at 5 kV.

• The maximum fuse rating for feeder applications is 200E at 5 kV.

• Dual ATL starter configurations are rated for maximum 5 kV operation.

In comparison to the standard ATL motor starter configuration, the dual ATL configuration has two equivalent compartments stacked on top of each other. The sections are housed in the compartments as follows:

• Isolation sections are located behind a barrier in each main compartment

• Medium voltage sections are located in the lower half of each main compartment

• Low voltage sections are located in a compartment on each door

The dual ATL starter configuration is designed for independent operation and maintenance of each compartment.

A typical MotorSeT dual ATL motor controller assembly is shown in the figure Typical View — Dual ATL Motor Controller.

Typical View — Dual ATL Motor Controller
Front view	Front interior view	Side view

MotorSeT ATL motor starter is also available in a feeder configuration. Feeder configurations are used for basic short-circuit protection for equipment other than motors. If the feeder becomes inoperable or is turned off, all downstream equipment loses power and operation stops.

Typical applications for feeders provide upstream protection for transformers or variable frequency drives (VFDs). For transformers, feeder protective relays are required because transformers have no built-in protection. VFDs have built-in protection and do not require additional protection.

Compared with the standard ATL configuration, the feeder unit comes as follows:

• E-rated fuses

• Power On and Power Off control buttons (the standard unit comes with Start and Stop control buttons)

• Optional customer-specified feeder protective relay in the low voltage section with potential transformer and current transformers for measurement and monitoring

• No electronic motor protective relay is installed

An arc-resistant option is available with the MotorSeT motor controllers. Should an internal arc event occur, the arc-resistant option directs the arc flash energy inside of the equipment to the release vents or plenum.

Two arc-resistant options are available for the ATL controller:

• The 40 kA, 0.5 seconds, Type 2B rating is available as either a flap or plenum vent design. These options require a 36 in. deep enclosure.

• The 50 kA, 0.5 seconds, Type 2B rating uses a plenum vent design. This option requires a 48 in. deep enclosure.

The total height of the ATL with plenum designs is 106 in.

The MotorSeT MV ATL Motor Controller enclosure is manufactured to meet the customer specification. It is designed and manufactured to meet the Uniform Building Code section on non-building structure, section 2338 for Zone 1, 2, 3, and 4 requirements.