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Notes for Figure 2.3
1
The accelerometer case is connected to the machine earth and the
differential signal output is isolated. The accelerometer case connects to the
extension cable shield through the cable connector for the hardline cable and
connects to the outer shield for the softline cable.
3
The interface module case must be isolated. Bently Nevada housing, part
number 80808-01, or -02, contains a mounting plate which provides isolation.
Wiring Recommendations:
2
Accelerometer to interface: Use extension cable, Bently Nevada part
numbers 45358-07 and -09, or 83387-xxx, or equivalent.
5
Interface module to monitor Power, Common, and +Velocity wiring
recommendation: 18 to 22 AWG stranded, three conductor wire with insulating
sheath and 100% shield coverage. 1000 feet (305 metres) maximum. 18 AWG
Belden 83336 or 22 AWG Belden 83334 can be used.
Shielding:
4
At the interface module the shield connects to the terminal marked CASE
SHIELD. Note that a jumper shunt is installed between the terminal block
mounting screw and the CASE SHIELD terminal.
6
The shield terminates at signal common at the monitor. The jumper
between signal common and 3300 rack chassis should be installed on the Power
Input Module at the rear of the 3300 rack. See the 3300 System Installation
Instructions, (document part number 80172-01).
7
3300 series monitors other than the 3300/95 must be modified before
connection to the interface module. Contact your Bently Nevada representative.
Other connections are possible. For example the acceleration signal could be
connected to a monitor for some special applications.
Section 3 - INSTALLATION
13
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