Print Date 04/01/11 Page 25 of 42 E2165-00MA-04
2.3 SETTING UP PROCEDURES
2.3.1 Fuses
If any problems occur after the Exciter has been installed and switched on, fuses may need to be
checked and possibly replaced. However, a blown or high impedance fuse would generally indicate
the presence of a fault, which would need correcting.
The type, function and access to fuses is as follows :
Type
Function
Access
6.3A (T) HBC
5x20mm Fuse
For protection of ac supply input
circuitry.
If this fuse blows, all Exciter
operation ceases
FS1 at the right rear of the unit (being
part of mains input socket PL03).
! CAUTION ! Ensure that the mains
supply is either disconnected or is
switched to ‘off’ at the distribution
board (preferably being locked in that
position).
0.21A Hold
SMD 030-2
Resettable Fuse
For protection of the +12V dc
output on the rear panel Status
connector SK12.
If this fuse goes high impedance,
any external equipment powered off
this supply will cease operation.
Access to this fuse is not normally
required (smd fuse is fitted to the
Input/Output Board, on which SK12 is
located).
This fuse will automatically reset if the
externally
supplied
equipment
is
momentarily disconnected or if the
mains
supply
to
the
Exciter
is
interrupted.
0.21A Hold
SMD 030-2
Resettable Fuse
(XE150)
or
0.35A Hold
SMD 050-2
Resettable Fuse
(XE300)
For protection of the rear panel fan
and its supply leads.
If this fuse goes high impedance,
this fan will cease operation. The
Fan led will go red. After a period,
the Output Amplifier temperature
will increase and the output power
eventually turn done (with an over-
temperature indication).
Access to this fuse is not normally
required. This smd fuse is fitted on the
narrow printed circuit board (Fan Control
Board) immediately in front of the power
supply unit (and behind the front panel).
This fuse will automatically reset if the
Fan is momentarily disconnected or if
the mains supply to the Exciter is
interrupted.
1.4A Hold
SMD 200-2
Resettable Fuse
For protection of all circuitry
supplied by the internal +12V dc
supply.
If this fuse goes high impedance,
virtually all Exciter operation ceases
(apart from the fan).
Access to this fuse is not normally
required. This smd fuse is fitted on the
narrow printed circuit board (Fan Control
Board) immediately in front of the power
supply unit (and behind the front panel).
This fuse will automatically reset if the
mains
supply
to
the
Exciter
is
interrupted.
