MAN B&W 5.17
Page 2 of 3
MAN DieselMAN Diesel
198 49 292.3MAN B&W MC/MCC, ME-B/ME/MEC engines
A cable with a cross section not less than 45 mm²
is used for cabling the shaftline earthing device to
the hull. The length of the cable to the hull should
be as short as possible.
Monitoring equipment should have a 4-20 mA
signal for alarm and a two range mV-meter with
a switch for changing range. Primary range from
0 mV to 50 -150 mV DC, and secondary range
from 0 mV to 300-1500 mV DC.
2UDDER
6OLTAGEæMONITORINGæ
FORæSHAFTçHULLæPOTENTIALæ
DIFFERENCE
3HAFTLINE
EARTHINGæDEVICE
6
0ROPELLERæSHAFT
)NTERMEDIATEæSHAFT
)NTERMEDIATEæSHAFTæBEARING
#URRENT
4HRUSTæBEARING
-AINæBEARINGS
0ROPELLER
079 21 82-1.2.2.0
Fig. 5.17.02: The shaftline earthing device slip rings must be tted on the foremost intermediate shaft as close to the
engine as possible
When the shaftline earthing device is working
correctly, the electrical potential will normally be
within the range of 10-50 mV DC. The alarm set-
points should be 5 mV for a low alarm and 80 mV
for a high alarm. The alarm signals with an alarm
delay of 30 seconds and an alarm cut-off, when
the engine is stopped, must be connected to the
alarm system.
Connection of cables as shown on the sketch,
Fig. 5.17.01.
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