Carbolite HTF 18 - Manual (Page 18)

MF47-3.05 18
8.0 F USES & P OWER C ONTROL
8.1 Fuses
F1-F2: Refer to the circuit diagrams.
F1
Internal supply
fuses Fitted if a supply cable originally
fitted. Ferraz fuse of the rating shown
F2
Auxiliary
circuit fuses 2 Amps type F
32mm x 6mm
F4 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