5
Low Pass Filter Selection
The CMCP700S-
CVT’s bandwidth is controlled by switches LP1 and LP2. Both switches should always in either on or
off. The filters are based on ISO 2372 (10816) standards for machines which operate in the 600 to 12,000 RPM
Range.
LP1
LP2
Filter Range
ON
ON
10 to 1kHz (ISO Standard, Velocity)
OFF
OFF
10 to 10kHz (ISO Standard, Acceleration)
Temperature Output
The CMCP700S-CVT supports CMCP786T type (or compatible) dual output accelerometer and temperature sensors
with a sensitivity of 10mV/°C. The maximum input voltage range is 1.5VDC which corresponds to a 0 to 150°C Full-
Scale range on the 4-20mA output. The temperature signal is connected to terminal number 3. Power to
CMCP786T type sensors is provided through the accelerometer circuit.
Buffered Dynamic Output
A buffered, unfiltered version of the connected sensors AC signal is available on the front panel BNC connector.
Buffered outputs allow for live, online signal analysis and/or sensor testing. The sensors DC bias voltage is passed
through the buffered output to allow for proper operation of OK circuitry on portable data collectors as well as
allow for easy troubleshooting of the associated sensor. The BNC buffered output is tied in parallel to the buffered
output screw terminals which allow for hardwired connections to other test equipment. Buffered Outputs are
short circuit protected and have an output impedance less than of 50 ohms.
Note
–
when connecting a portable data collector or online system, the devices constant current power source
should be turned off. Failure to do so may result in a corrupt measurement.
Sensor OK/Fault Indicator
The CMCP700S-CVT features a local sensor status LED on the front panel. The LED is controlled by the transmitters
“OK” circuitry. When the transmitter is powered on, and the sensor is operating normally, the LED will be Green.
This indicates a good sensor signal. If the sensor’s bias voltage (BOV)
is low or high, the LED will turn Red to
indicate a sensor fault.
4-20mA Outputs
The CMCP700S-CVT provides two analog 4-20mA current outputs, one for vibration and the other for temperature.
Both 4-20mA loops are active, meaning the transmitter source the voltage rom the transmitter. The 4-20mA
outputs should be connected to a passive input on a PLC, SCADA or BMS or DCS system. The total loop resistance
for each loop should not exceed 600 Ohms. If the temperature output loop is not used, do not connect any wires
to the terminals.
Wiring
The CMCP700S-CVT provides power for low-impedance type transducers via a nominal 4.4 mA constant current
source. This is generally enough current to allow operation with transducer cables extending up to about 200 ft.
However, it is strongly recommended that the transmitter be mounted as close as practical to the associated
transducer. This will prevent signal distortion associated with current drive limitations and will minimize
interference from external electro-magnetic noise sources (EMI). A well shielded, properly installed transducer
cable is necessary to obtain reliable operation. Twisted-shielded pair cables designed and pre-fitted with the
proper transducer connector and sold for this specific purpose are highly recommended. The cable shield should
be open at the transducer end and connected to common (VIB IN-) at the transmitter input only. The cable should
be routed as far away from other electrical circuits and ran in metal conduit where possible.