Westerbeke 7.0 KW BGC -60Hz Technical Manual page 139

2. Diodes 8 - 9.5 ohm (approximate)
using a 260 Simpson Analog Meter
To check the diode, unsolder the connection from the
top of the diode. Place one ohmmeter lead on the
connection at the top of the diode and the other
ohmmeter lead to the diode's base. Then reverse the
position of the ohmmeter leads.
A low resistance should
be
found with the leads in one
direction, and infinite resistance (blocking) in the other
direction. Different meters will read different resistance
values through the diode.
NOTE: Different meter models may show different ohm
values but, should
be
the same for both diodes.
Diode Rating:
1600 Volts
26 Amps
,...
i
(+)
~
en
u;
~
z
n
m
(-)
DIODE
The diode's rating is far in excess of the circuit's requirements. Most likely a diode failure will result from an
overspeed or load surge. A diode failure would
be
attributed to a manufacturing defect.
B. Main Stator Windings
4.5 KW BCG: 0.6 ohm 7.0 KW BCG & BCGA: 0.4 ohm
To check main stator winding values at the AC terminal block, first remove all AC output leads, the
ground connection, and all and brass interconnects from the terminals on the block. This will isolate
the 6 or 4 leads on the terminal block which make up the two main stator groups.
1 NOTE: The numbered leads on the terminal blocks are not in
any numerical order. They are as shown below.
1
4 3 1 4
2
0 0
0 0 0 0
4
5
2 6
5
2
0
0
0
0
0 0
4.5
&
7.9 KW BCG 7.8 KW BCGA
~
_ _
~~5~
Terminal Blocks
4.5 KW BCG & 7.B KW BCG 7.9 KW BCGA
135 Westerbeke Generators