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Typical circuit diagram of Direct On Line starter

S0 S1 S K1 F1 F2 F3

= = = = = = =

`OFF' Push button `ON' Push button Maintained command switch Main contactor Main circuit fuse Overload relay Control circuit fuse

a) Main circuit

b) Control circuit for momentary-contact control

c) Control circuit for maintained-contact control

Typical circuit diagram of Forward / Reverse starter (Electrical Interlocking)

L1/L+ F3 F2 S0 S2 K1

22 53 54 95 96

L1/L+ F3 F2

95 96

S1 S2 K2

22 53 54

10 2

S

S1

NSK-6970c

N/L

K1

A1 A2

21

21

K2

A1 A2

N/L

K1

A1 K2 A2

A1 A2

Push button control (momentary command) Main circuit

S0 : 'OFF' Push button S1 : 'ON Clockwise' Push button S2 : 'ON Anti-clockwise' Push button S : Selector Switch 'Clockwise - OFF Anti-clockwise' K1 : Clockwise contactor K2 : Anti-clockwise contactor

Selector switch control (command needs to be maintained)

F1 : Main circuit fuses F2 : Overload relay F3 : Control circuit fuse

Typical circuit diagram of Star Delta starter

Main circuit

Control circuit for push button control (momentary command)

S0 S1 K1 K2 K3 K4 F2 F1 F3

= = = = = = = = =

`OFF' Push button `ON' Push button Line contactor Star contactor Delta contactor Star delta timer (7PU60 20) Overload relay Backup fuse Control circuit fuse

NSK-6971c

K2

K1

K2

22 21

K1

22 21

Typical circuit diagram for Auto Transformer starter

S0 S1 K1 K2 K3 K5 K4 F1 F2 F3

= `OFF' Push button = `ON' Push button = Star contactor = Transformer contactor = Main contactor = Contactor relay (2NO + 2NC) = Time relay (7PU6020) = Main circuit fuses = Overload relay = Control circuit fuse

b) Auxiliary circuit for momentary-contact control

a) Main Circuit

Internal connection diagram for DC coil circuits

K1 : Sizes 3 to 6, 3TF46 to 3TF51

K1 : Sizes 8 to 12 3TF52 to 3TF56 K2 : 3TF30 10 OB.. for 3TF54/55 3TF32 00-OB.. for 3TF56

K1 : Size 12 3TF57 K2 : 3TC44 17 4A..

The control circuits indicated by dotted lines are to be wired by customer.

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