Basic Instructions and Wiring Connections
Normal Wiring as Vibration and Temperature (optional) Transmitter with CMPT DCL Modules for Stand Alone Monitoring
SKF Copperhead Transmitter Unit CMPT CTU7-20
Instruction Manual
Normal Wiring as Vibration and Temperature (optional) Transmitter with CMPT
DCL Modules for Stand Alone Monitoring
An accelerometer sensor and CMPT CTU can be connected to a CMPT DCL module for
stand alone vibration monitoring. A second DCL module may be used for optional
temperature monitoring. The DCL module provides a digital display of the processed
vibration (or optional temperature) signal and has a single alarm and relay function for
local annunciation of a change in vibration or temperature. See the wiring diagram in
Figure 7-5 and refer to the CMPT DCL Instruction Manual for wiring and setting details.
This applies to SKF CMPT sensors 2310, 2310T, 2323 and 2323T.
The sensor ground wire is connected to the inner shield of the sensor cable. This wire should be connected to
ground (earth) inside the CMPT CTU enclosure. The sensors have a stainless steel over braid. The braids for
mechanical protection of the cable. The braid also acts as an outer shield. It is advised to isolate (shield) the
sensor ground wire from the braid and local ground (earth). The cable braid and the sensor ground wire
should not contact each other or else a “ground loop” may occur causing signal interference.
Figure 7-5: CMPT sensor and CTU connected with two CMPT DCL display/alarm
modules for stand alone monitoring with a temperature sensor
The SENSOR OK lamp will be red if the temperature sensor is not connected. A 100 W
or a 120 W resistor is required between CTU terminals 2 and 3 to avoid the red
SENSOR OK lamp.
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