Carbolite HTF 18 User Manual download pdf (Page 18)

MF47-3.05 18

8.0 FUSES & POWER CONTROL

8.1 Fuses

F1-F2: Refer to the circuit diagrams.

Internal supply

fuses

Fitted if a supply cable originally

fitted.

Ferraz fuse of the rating shown

Auxiliary

circuit fuses

2 Amps type F

32mm x 6mm

Thyristor Fuse

Ferraz Protistor fuse of the rating

shown

Customer

fuses

Required if no supply cable fitted.

Recommended if cable fitted.

See rating label for amperage; see

table below for fuse rating.

The table below gives the fuse rating for the various models.

8.2 Power Control

The setting for the power limit parameter in the controller (OP.Hi) should be 100% for all models.

The current-limiting thyristor stacks are set to the maximum element currents given in the table.

TABLE OF FUSE AND CURRENT LIMIT VALUES

Model

Phases

volts

supply fuse

rating

thyristor

fuse

rating

current

limit

(element

circuit) †

HTF 17/5

1-phase

208

20A

30A

150A

HTF 17/5

1-phase

220-240

20A

30A

150A

HTF 17/10

1-phase

208

30A or 32A

50A

150A

HTF 17/10

1-phase

220-240

30A or 32A

50A

150A

HTF 17/10

2-phase *

380-415

20A

30A

150A

HTF 18/4

1-phase

208

20A

30A

140A

HTF 18/4

1-phase

220-240

25A

30A

140A

HTF 18/8

1-phase

208

32A

50A

140A

HTF 18/8

1-phase

220-240

30A

50A

140A

HTF 18/8

2-phase *

380-415

16A

30A

140A

* 2-phase designs use the line-to-line voltage; neutral is used for the control circuit

† see section 4.6 – the current limit setting at low temperatures is 146A

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