Carbolite TZF Series - Manual (Page 15)

1700-1800° Tube
MF32 - 3.25
15
8.0 F USES & P OWER C ONTROL
8.1 Fuses
F1 & F2 - see the example circuit diagram.
F1 Supply Fuses:
Supply fuses are not fitted internally unless the furnace is also fitted with a supply cable; when
fitted they are of GEC Safeclip of the type shown.
Customers should fuse at the rating shown.
F2 Control Fuses: 2 Amp type F 30mm x 6mm
Thyristor Fuse: Ferraz Protistor of the rating shown. Note that, unlike most fuses, protistor fuses
are correctly rated at a higher current than the thyristor they are protecting.
8.2 Power Control
The setting for the power limit parameter in the controller ( OP.Hi ) should be 100% for all models.
The thyristor stacks are set to the secondary (element) maximum currents given in the table.
Model Phases volts supply fuse
rating
type
thyristor
fuse
rating Current
limit
(element
circuit)
CTF 17/300 1-phase 220-240 30-32A NS32 50A 90A
CTF 17/600 1-phase 220-240 50A ES50 63A 90A
CTF 17/600 3-phase 380/220-415/240 25A NS25 2 x 30A
+ 1 x 20A 134A
CTF 17/600 3-phase delta 220-240 25A NS25 2 x 30A
+ 1 x 20A 134A
TZF 17/600 1-phase 220-240 50A ES50 2 x 20A
+ 1 x 50A 90A
TZF 17/600 3-phase 380/220-415/240 30-32A NS32 2 x 20A
+ 1 x 50A 90A
TZF 17/600 3-phase delta 220-240 40A ES40 2 x 20A
+ 1 x 50A 90A
CTF 18/300 1-phase 220-240 30-32A NS32 50A 134A
CTF 18/600 1-phase 220-240 50A ES50 63A 134A
CTF 18/600 3-phase 380/220-415/240 25A NS25 2 x 30A
+ 1 x 20A 134A
CTF 18/600 3-phase delta 220-240 40A ES40 2 x 30A
+ 1 x 20A 134A
TZF 18/600 1-phase 220-240 63A ES63 2 x 20A
+ 1 x 50A 90A
TZF 18/600 3-phase 380/220-415/240 32A NS32 2 x 20A
+ 1 x 50A 90A
TZF 18/600 3-phase delta 220-240 63A ES63 2 x 20A
+ 1 x 50A 90A