EATON A200 Size 5 Motor Controller

Eaton A200/A210/A250 Size 5 motor controller: providing reliable full voltage starting and overload protection for industrial applications

Product Overview: Full voltage starting and overload protection

The A200, A210, and A250 Size 5 motor controllers, when properly wired according to the connection diagram, can operate as full voltage starters and provide overload protection through overload relays. It should be noted that the controller itself does not provide short-circuit protection and needs to be used in conjunction with appropriate short-circuit protection equipment. Two pole controllers and three pole devices have the same current rating, but are not suitable for controlling three-phase motors.

This series of controllers is suitable for circuits up to 600 V, and its short-circuit withstand capability depends on the type of short-circuit protection equipment provided, as shown in Table I. For example, when combined with Class J, K, R, or T fuses, the short-circuit rating can reach 65000 A @ 600 V; When combined with specific models of thermal magnetic circuit breakers (such as HKD, KDC), the short-circuit rating can reach 65000-100000 A.

Installation requirements and mechanical inspection

The controller must be installed on a vertical surface, with the incoming terminal located above the load terminal. After installation, the controller mechanism and accessories should be inspected for the following before powering on:

The crossbar and spring should move freely.

The electrical and mechanical interlocking devices are installed correctly and adjusted in place.

Install the appropriate operating coil and connect it correctly.

The arc extinguishing cover must be in place and firmly fixed: it is strictly prohibited to power on the controller without installing the arc extinguishing cover.

The main contact should have sufficient overtravel and spring force.

Dimensional information: The external dimensions of the A210 controller are shown in Figure 2, measured in inches.

Types and configurations of overload relays

B-type overload relay (see Figure 1)

The A200 controller is typically equipped with a B-type block type environmental compensation overload relay (gray reset lever). Non environmental compensation type (red reset lever) is also optional. This relay is a bimetallic strip with a normally closed control circuit contact and an optional isolated normally open control circuit contact. When the overload relay trips, a yellow dot will be exposed below the reset lever, and the indicator will return to its hidden state after resetting.

A-type overload relay (see Figure 4)

Type A overload relay is either non environmental compensation type (red reset lever) or temperature compensation type (gray reset lever, marked as "ambient compensated"). Its characteristics include:

Release indicator

Tripping adjustment with a setting range of ± 15%

A normally closed control circuit contact

Can choose manual or automatic reset

The reset method is determined by the position of the metal plate on the load side of the overload base: moving the metal plate away from the panel is in the "manual" position, and moving it towards the panel is in the "automatic" position. Warning: It is strictly prohibited to use the automatic reset function in situations where a two-wire control circuit is used and the motor automatically starts, which may cause danger.

Overload relay heating element

Heating elements need to be ordered separately and selected based on the full load current and service factor on the motor nameplate. The selection principle is as follows:

When the motor service factor is 1.15-1.25, select directly according to the heating element application table.

When the service factor is 1.0, the service factor is not specified, or the maximum 115% protection is desired, select a heating element that is one level lower than the indicated value.

When the motor and overload relay are at different ambient temperatures, the motor current needs to be corrected: for every 1 ° C higher than the controller environment in the motor environment, the rated current of the motor decreases by 1%; On the contrary, every 1 ° C increases by 1%.

Warning: If overcurrent components burn out, the entire overload relay must be replaced to ensure fire and electric shock protection. The replacement model is shown in Table IV.

Rated values of overload relay control circuit contacts (see Table III):

Type A: normally closed contact 20 A on/2 A off (24-120 V AC); Normally open contact 5 A connected/0.5 A disconnected

Type B: normally closed contact 30 A on/3 A off (24-120 V AC); Normally open contact 30 A for connection/3 A for disconnection

Auxiliary contact - J-type

Each Size 5 controller can install up to two auxiliary contact units, providing a total of four auxiliary circuits. The auxiliary contact unit is fixed in a metal bracket through a spring clip and driven by a metal operating component installed on the crossbar. During installation, the L-shaped operating component needs to be adjusted so that it touches the beveled edge of the push rod exactly. The contact type and catalog number are shown in Table VI.