Testing Relays - Westerbeke 5.0KW BCG-60Hz Service Manual

TESTING RELAYS
GENERAL
All DC voltage measurements are made to the engine battery
negative ground point unless specified otherwise. In making
test measurements, make sure that a good ground for the
meter is established, preferably the point where the negative
battery is connected to the engine. Battery positive voltage is
indicated as B+
and
should measure no less
than
11.5 volts.
AC voltage measurements should be made with a true
RMS AC meter to insure measurement accuracy.
ENG INE. GRO U NO
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GROUND AND 8(+)
CONNECTIONS
RELAYS
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The relays used in the control system have coils which are
polarized by the fact that they have internal free wheeling
suppression diodes across them. Relay coil terminal 86 must
be maintained (+), terminal 85(-). The relay coil is rated 12V
DC, and the coil resistance is typically 85 ohms. With B+ on
terminal 86, direct grounding of terminal 85 is permissible
for testing purposes.
RELAYS ARE MOUNTED
TO THE FLOOR OF THE
CONTROL PANEL
RELAYS
FOR WIRING CONNECTIONS,
REFER TO THE WIRING
, DIAGRAM
..
~~
~'l~
Engines
&
Generators
47
TAP THE GROUND
CONNECTION TO
THE TERMINAL.
RELAY SHOULD
____
~
"CLICK" ON.
TO B(+)
TESTING THE RELAY
TERMINALS
TESTING COIL RESISTANCE