Bently Nevada 3500/50M 286566-02 Signal module monitor

Description

3500/50M 286566-02 Bently Nevada Corporation recommends placing as many Proximitors as possible in the same protective enclosure, provided that all can be installed without altering the electrical length of the probe-to-Proximitor cabling. Enclosing multiple Proximitors decreases installation costs and simplifies the routing of cables from the Proximitors to the monitors. Check with the nearest Bently Nevada Corporation office for information on available Proximitor housings.

Before installing power and signal connections, make sure the Proximitor supply voltage is within a range of -17.5 Vdc to -26 Vdc, referenced to supply common. The exact voltage depends on the requirements of the monitor being used with the system. When used with a -24 Vdc power source, the 14 Millimetre Proximity Transducer System offers a linear range of approximately 160 mils (4.06 mm). As the power source decreases (-18 Vdc for instance) there is a decrease in the linear range. See Appendix C.

3500/50M 286566-02 Field wiring from the Proximitor to the monitor is generally provided by the user unless a specific request is made to have Bently Nevada Corporation do the fabrication. Shielded three-wire cable should be used.

Proper isolation and shield grounding ensures that a minimum amount of noise will be induced in the signal conductor. Bently Nevada Corporation recommends electrically isolating all Proximitors. The Proximitor protective housings manufactured by Bently Nevada Corporation can be ordered to include the isolation kits. For retrofit and conversion situations, Bently Nevada Corporation offers a Proximitor Isolation Kit (BNC P/N 19094-01).

The probe is internally isolated to provide shield isolation at the probe end. The probe cable shield is physically connected to the Proximitor case which is isolated with FEP insulation. Figure 2-4 shows the field wiring and shield grounding connections made to 7000, 7200, and 9000 Series monitors.

The shield of each field wiring cable should be earth grounded at only one end; the other end should not be grounded. All shields of field wiring connected to the monitors in the same rack should connect to the same earth ground to avoid ground loops. If safety barriers are not used in the field wiring, each monitor-end shield connects to the COM terminal of the respective rack signal module. The signal module COM terminals are connected to ground by a user-installed jumper wire connecting a specific remote reset terminal (common) to the earth ground. If safety barriers are used, shields are connected to the earth ground bus, and the jumper wire between the remote reset terminal and earth ground must not be installed.

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