Doc#
M8687 • REV E
July 2017 Page
2 of 8
OUT BNC connector is important for analysis purposes. If an accelerometer, piezoelectric ve
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locity transducer or charge amp is used, correct polarity must be observed. The cable shield
should be wired to the terminal as follows:
4-20 mA (Current Source Output):
Wire the receiving device to
these terminals, observing correct polarity. The total resistance of
the receiver input and wiring must be between 25 and 600 ohms.
SIG OUT (Signal Output):
This signal is identical to the input signal
and is buffered for driving remote vibration analysis instruments. The
terminal block terminals and the BNC connector are wired in parallel.
24 VDC (Power Input):
For best results, the sum of the DC power
voltage, plus or minus AC ripple and noise, should be within 20 to 30
volts.
In Class I, Div. 2, Groups A, B, C & D locations, the signal conditioner
may be wired in accordance with page 4 or drawing 9031. Pages
6 and 7 show wiring diagrams for the 5534/5544 and 5535/5545,
respectively.
INSTALLATION CONSIDERATIONS
Many variables exist in transmitter installations such as location, type of enclosure, proximity
and type of other devices, type and length of wiring, etc.
In general, the transmitter should be located in a separate enclosure from electrical systems,
which switch electrical power at large voltages or currents, such as motor controls. Grounded
metal enclosures are muchpreferred to nonmetallic ones in areas where strong AC power or
radio frequency (RF) fields are present, even on an intermittent basis. Possible sources of
electrical interference are electrical motors and generators, SCR drives, motor contactors, RF
heaters, engine ignition systems, handheld transceivers (walkie-talkies), cell phones, etc.
Handheld transceivers and cell phones are capable of interfering with the proper opera
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tion of the transmitter, especially with the enclosure door open and the device held in close
proximity to wiring. The RF filtering components in the transmitter protect against normally
expected RF levels, but excessive levels can cause interference. It is good practice to keep
operating RF sources as far away from electronic devices as possible. In severe cases a fer
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rite core (Metrix Part# 97007-006) may be required to be added on power or signal wiring.
These commonly available devices are either snapped over the wiring or the wiring is looped
several times through the device.
In some installations, the 24VDC power source can have significant electrical noise present.
Common sources of noise are battery chargers, unregulated power supplies and switch
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ing type power supplies. 24VDC relays and solenoids that are not protected with snubbing
diodes or transient protectors will generate voltage transients that may interfere with the
proper operation of the transmitter. Ensure that the 24VDC power source is a regulated type
and free from electrical noise under all conditions.
None of the wiring connected to the transmitter or other devices within the enclosure
should be run in conduits or cable trays with plant power wiring or control relay and sole
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noid wiring. All inputs and outputs should be wired with shielded cables. Totally shielded
(100% foil) cables are preferred to 90% braided type shielded cables. The shield should be