Cutler Hammer, Div of Eaton Corp S752 Operation Diagram

39

Reduced Voltage Motor Starters
Solid-State Starters

Type S752, Intelligent Technologies (IT.) Soft Starters

Operation

Voltage Ramp Start

Provides a voltage ramp to the motor
resulting in a constant torque increase.
The most commonly used form of soft
start, this start mode allows you to set
the initial torque value and the dura­tion of the ramp to full voltage condi­tions. Bypass contactor(s) close after
ramp time.

■ Adjustable initial torque 0 – 95% of

locked rotor torque.

■ Adjustable ramp time .5 – 30

seconds.

Soft Stop

Allows for a controlled stopping of a
load. Used when a stop-time that is
greater than the coast-to-stop time is
desired. Often used with high friction
loads where a sudden stop may cause
system or product damage.

■ Stop time = 0 – 30 seconds.

100%

Initial

Locked Rotor Torque

Torque

Time (Seconds)

Figure 39-5. Starting Characteristics — Ramp Start

Run

Run (FLA)

Ramp

Time (Seconds)

Figure 39-6. Starting Characteristics — Soft Stop

Catalog Number Selection

Table 39-14. S752 Open Soft Starters Catalog Numbering System

S 7 5 2 L 5 0 N 3 S

S = IT. Soft Starter

752 = Non-combination

Soft Starter

S = Standard Soft Starter —

L = 54 mm

01 = 1 Amp
02 = 2 Amp
04 = 4 Amp
09 = 9 Amp



Inside-the-delta version only.

Frame Size

Device Rating

16 = 16 Amp
27 = 27 Amp
50 = 50 Amp

D = Inside-the-Delta Control

3 = 3-Pole Device

N = No Options

Voltage Rating

V02 = 240V
V06 = 600V

In-Line Control

