SKF CMPT CTU Manuel utilisateur
SKF Copperhead Transmitter Unit (CMPT CTU)
for Machinery Fault Detection
Copyright © 2011 by SKF Reliability Systems
All rights reserved.
Aurorum 30, 977 75 Luleå
Sweden
Telephone: +46 (0) 920 758 00, Fax: +46 (0) 920 134 40
Part No. 32163100
Revision D
Instruction Manual
SKF Reliability Systems
SKF Condition Monitoring Center
Aurorum 30
977 75 Luleå
Sweden
Telephone +46 (0) 920 758 00
FAX +46 (0) 920 134 40
For technical support, contact:
or
America.
Visit us at our web site
www.skf.com/cm
® SKF is a registered trademark of the SKF Group
SKF Copperhead Transmitter Unit CMPT CTU TOC-3
Instruction Manual
Table of Contents
Description 1 - 4
Features 2 - 5
Specifications 3 - 7
Dimensions/Front panel/Terminals 4 - 9
....................................................................................................4 - 9
Front Panel Rotary Switches
....................................................................................................4 - 11
Connector Assignment
Caution 5 - 12
CMPT CTU Output Signal Scales 6 - 13
....................................................................................................6 - 13
Vibration
....................................................................................................6 - 16
Temperature
Basic Instructions and Wiring Connections 7 - 17
....................................................................................................7 - 17
General Instructions
....................................................................................................7 - 18
Normal Wiring as Vibration and Temperature (optional) Transmitter
....................................................................................................7 - 20
Normal Wiring as Vibration and Temperature (optional) Transmitter with
CMPT DCL Modules for Stand Alone Monitoring
....................................................................................................7 - 21
Parallel Wiring with Secondary CTU
CMPT CTU Output 8 - 22
Interface with Dataloggers and Vibration Systems 9 - 24
CTU CAN-bus 10 - 25
....................................................................................................10 - 25
CTU CAN-bus Connection
....................................................................................................10 - 27
CTU CAN Protocol
....................................................................................................10 - 28
Services
....................................................................................................10 - 30
Unit Address
....................................................................................................10 - 32
Overall Measurement Values
Description
SKF Copperhead Transmitter Unit CMPT CTU1-4
Instruction Manual
Description
1
Figure 1-1: CMPT CTU (Copperhead Transmitter Unit)
This instruction manual provides detailed wiring connection and configuration
information for the CMPT CTU (Copperhead Transmitter Unit) vibration and
temperature transmitter. The CMPT CTU is configured by SKF when it is part of an
assembled CMPT enclosure. The CMPT CTU must otherwise be properly installed and
configured by the user. This instruction manual provides the user with information on
how to properly install and configure the CTU and change the default configuration
settings.
Please read this instruction manual and the cautionary notes thoroughly.
The SKF CTU is a digital vibration and temperature transmitter. It can be used as a part
of a machinery fault detection system. The CTU performs three types of vibration signal
process analysis – SKF Acceleration Enveloping (gE), Acceleration (g), or Velocity (mm/s
or inch/s). The type of vibration analysis is user configurable. The CTU has analog
output signals proportional to processed vibration analysis and temperature for
connection to automation systems and SKF CMPT DCL monitors. The CTU is user
configurable to process vibration signals from the SKF CMPT family of sensors or other
industrial accelerometers.
Acceleration Enveloping vibration analysis is used to identify repetitive impact type
vibrations generated by machinery faults due to loose components, gear faults, lack of
lubrication and rolling bearing faults.
Acceleration vibration analysis is used to monitor overall machinery and structural
vibration, including machinery having journal bearings. It can also be used to measure
the overall operation of vibrating screens and other vibrating equipment.
Velocity vibration analysis is used to identify overall machinery vibration levels such as
looseness and unbalance, including machinery support by journal bearings.
The CMPT CTU has unique features to monitor both high speed and low speed
machinery (n <40 r/min).
SKF Copperhead Transmitter Unit CMPT CTU 2-5
Features
Instruction Manual
Features
2
·Suitable with accelerometer sensors (10 mV/g to 230 mV/g).
·Temperature converter for accelerometers with integral temperature sensors.
·Three user selectable vibration process analyses:
- SKF Acceleration Enveloping (ENV3), gE
- Acceleration (RMS and Peak Hold), g
- Velocity ISO, mm/s (inch/s)
·User configurable features on the front panel:
- Vibration analyzer
- Output Range
- Optional sensor input or buffered vibration output input
- Optional signal decay for Acceleration Enveloping Peak hold
- Optional output signal averaging.
·Analog output signals - Processed vibration and temperature for interface with
PLC/DCS and CMPT DCL alarm/display monitors.
·35 mm DIN rail mounted with rugged steel retainer clip.
·Front panel mounted BNC connector for buffered vibration and temperature
measurements.
·Front panel sensor OK/Overload lamp for detection of sensor and CTU faults.
·CAN-bus interface for connectivity of multiple numbers of CTU and remote
monitoring via computer.
·Internal isolated DC/DC converter for grounding loop and reverse polarity
protection.
·Auxiliary 24 V DC voltage output for optional powering of other sensor types
(tachometer).
The software to process the vibration and temperature signals is embedded into the
digital signal processing (DSP) card in the CTU. Calibration of the CTU is a part of the
embedded software.
The CTU unit has two front panel rotary switches to set the configuration. There is no
need to open the CTU enclosure to adjust pins or jumpers. The BNC connector is front
panel switchable (BNC switch) to measure either the accelerometer sensor buffered
(not processed) vibration output or the sensor temperature output. The buffered
vibration output can be monitored with an SKF Microlog or equivalent device.
The CTU has a user configurable option to average the analog output signals so that
rapid changes in vibration input do not cause annoying fluctuations in PLC/DCS or
digital displays.
The CTU has a user configurable option of 1 second or 10 second signal decay time for
Acceleration Enveloping Peak hold. The 10 second signal decay time is recommended
for low speed (n <40 r/min) applications where the frequency of the mechanical impact
vibration is low. Normal operation of the CTU is with the 1 second signal decay time.
The CTU can be user configured to accept a constant current signal from another CTU
operating with an accelerometer sensor. This enables two CTUs having different
configurations such as one Acceleration Enveloping and one Velocity to monitor the
same accelerometer sensor signal.
Features
SKF Copperhead Transmitter Unit CMPT CTU2-6
Instruction Manual
The CTU has a front panel mounted SENSOR OK lamp to indicate that the sensor is
correctly connected to the CTU and that the sensor (accelerometer and temperature)
and the CTU are operating correctly.
- Green indicates that the system is OK (Correct).
- Red indicates that the system has a fault with the sensor or CTU, or that the
vibration level or temperature exceeds the set RANGE (overload).
The CTU can be located up to 100 m (330 feet) from the sensor with suitable shielded
cabling. The CMPT DCL display/alarm module can be used along with the CMPT CTU
module to have a stand-alone monitoring of processed vibration. A second DCL module
can be used to optionally monitor temperature from a CTU connected to a CMPT 2310T
or CMPT 2323T sensor. The CMPT DCL is a single channel display/alarm module. It
displays the live value from CTU on the front panel which is programmable. IT also has
relay contacts for independent monitoring of the processed signals from the CTU. See
the CMPT DCL data sheet.
Each CTU has a CAN-bus interface for remote communication with an industrial PC
using an SKF protocol software. This enables remote configuration and monitoring of
the CTU. The CAN-bus allows multiple numbers of CTU modules to be joined by a
common CAN-bus connecting cable. This greatly reduces the wiring connections needed
compared to the analog output signal cable requirements.
The CTU has an auxiliary 24 V DC power output for optional use to energize alternative
sensors (20 mA maximum).
The CTU has an internal isolated DC/DC converter to avoid grounding loop problems.
This isolates the 24 V power supply and the CAN-bus from the sensor input circuitry
and the analog sensor output circuitry. The power input is protected from reverse
polarity connections.
SKF Copperhead Transmitter Unit CMPT CTU 3-7
Specifications
Instruction Manual
Specifications
3
Input signals
Industrial accelerometer (2 wire, constant current source with voltage output)
Accelerometer sensitivity: 10 to 230 mV/g
Bias voltage: 12 V DC +/- 1 V
Supply current: 4 to 8 mA
Buffered acceleration signal
output from another CTU Buffered signal input mode
Supply voltage: 5 to 19 V
Temperature: 0 to 1,2 V DC @ 0,01 mV/°C
Environmental
Operating temperature: 0 to 70 °C (32 °F to 160 °F)
Storage temperature: -40 °C to 85 °C (-40 °F to 185 °F)
Humidity: 95 % maximum
IP rating: IP20
Vibration: IEC68-2-6
Shock: IEC68-2-27
Bump: IEC68-2-29
Mechanical
Weight: 0,225 kg (0,102 lbs)
Enclosure: Thermoplastic ABS
Color: Gray
Connectors: Two 8-pole pluggable screw clamp type
Wiring: 0,2 to 2,5 mm (24 to 12 AWG)
Mounting: 35 mm DIN-rail type EN50022 with steel retaining
clip
Dimensions (H x W x D): 75 x 45 x 118 mm
(2,95 x 1,77 x 4,65 inches)
Electrical
Power: 24 V DC (22 to 28 V DC)
250 mA current, maximum
CTU is reverse power protected
Power consumption: 6 W
Vibration process analysis
Acceleration Enveloping, gE
ENV3: 500 Hz – 10 kHz
Acceleration, g
Accel RMS: 3 Hz – 10 kHz
Accel Peak Hold: 3 Hz – 10 kHz
Velocity, mm/s (inch/s)
ISO: 10 Hz – 1 kHz
2 Hz – 1 kHz
Specifications
SKF Copperhead Transmitter Unit CMPT CTU3-8
Instruction Manual
Processed analog output signals
Vibration: 4 to 20 mA; 0 to 10 V DC
Proportional to the input sensitivity of the
accelerometer and the user defined signal
processing method (Acceleration Enveloping,
Acceleration or Velocity) and RANGE.
See Section 3.
Temperature: 4 to 20 mA; 0 to 10 V DC
Proportional to 0 °C to 120 °C
Analog signal less than 4 mA or greater than 20 mA indicates a system fault.
Auxiliary power:+24 V DC / 20 mA maximum
Approvals: CE
Emission 50081-2
Immunity 50082-2
SKF Copperhead Transmitter Unit CMPT CTU 4-9
Dimensions/Front panel/Terminals
Instruction Manual
Dimensions/Front panel/Terminals
4
Front Panel Rotary Switches
Figure 4-2: Dimensions and front panel
FUNCTION switch legend
0 Velocity (ISO), 10 Hz – 1 kHz
1 Velocity, 2 Hz – 1 kHz
4 Acceleration Peak Hold, 1 second decay
5 Acceleration Peak Hold, 10 seconds decay
6 Acceleration RMS, 1 second decay
7 Acceleration RMS, 10 seconds decay
C Acceleration Enveloping 3 (ENV3), 1 second decay
D Acceleration Enveloping 3 (ENV3), 10 second decay
RANGE switch legend
0 Range 0, Accelerometer sensor input ON, Output averaging OFF
1 Range 1, Accelerometer sensor input ON, Output averaging OFF
2 Range 2, Accelerometer sensor input ON, Output averaging OFF
3 Range 3, Accelerometer sensor input ON, Output averaging OFF
4 Range 0, Accelerometer sensor input ON, Output averaging ON
5 Range 1, Accelerometer sensor input ON, Output averaging ON
6 Range 2, Accelerometer sensor input ON, Output averaging ON
7 Range 3, Accelerometer sensor input ON, Output averaging ON
8 Range 0, Buffered signal input ON, Output averaging OFF
9 Range 1, Buffered signal input ON, Output averaging OFF
A Range 2, Buffered signal input ON, Output averaging OFF
B Range 3, Buffered signal input ON, Output averaging OFF
C Range 0, Buffered signal input ON, Output averaging ON
D Range 1, Buffered signal input ON, Output averaging ON
E Range 2, Buffered signal input ON, Output averaging ON
F Range 3, Buffered signal input ON, Output averaging ON
Dimensions/Front panel/Terminals
Front Panel Rotary Switches
SKF Copperhead Transmitter Unit CMPT CTU4-10
Instruction Manual
SENSOR OK lamp
Green Accelerometer and temperature sensor and CTU are
operating correctly
Green (flashing) CTU is settling output because of change in rotary switch
setting
Red Fault with sensors or vibration exceeds set RANGE *
Red (flashing) Vibration or temperature input signal exceeds full Scale
Red/Green (flashing) Unit failure (return to SKF for repair)
* The SENSOR OK lamp will be red if the temperature sensor is not connected. A 100 Wor a 120 Wresistor
is required between CTU terminals 2 and 3 to avoid the red SENSOR OK lamp.
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