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