Machine condition monitoring goes wireless
A
Sales Technology product story
Edited by the Engineeringtalk editorial team
Mar 26, 2004
STI has completed its first two wireless condition monitoring systems using CMCP500 series transmitters, A/D convertors and industrial radios.
STI has completed its first two wireless condition monitoring systems using CMCP500 series transmitters, A/D convertors and industrial radios.
Both Modbus RS485 and Modbus TCP/IP over Ethernet have been completed.
Wireless systems benefit the customer by dramatically reducing the cost of conduit and instrument wire for distant machine locations.
Wireless data transfer allows the customer to monitor machines where cost was prohibitive in the past.
The frequency hopping spread spectrum (FHSS) industrial radios are approved for worldwide use, with a typical range of 150 to 450m for indoor use.
With the use of high gain antennas, a range up to 25km can be reached, and repeaters can be used in difficult installations.
In the first application, a power company in California wanted to monitor its cooling tower fans and circulating water pumps that were 800m from the main building and the existing LAN.
Installing conduit and wire for this distance was considered prohibitive.
An old BNC 9000 Series system was scrapped in the cooling tower's mechanical room and CMCP530 and CMCP540 Series transmitters were installed along with accelerometers and CMSS68 series eddy probes for the journal bearings on the circulating water pumps.
The transmitters are connected to CMCP-RM-8AI A/D convertors that provide an RS485 Modbus output.
CMCP's new CMCP-2400-RS/485 industrial radios were installed to provide a RS485 Modbus LAN connection from the cooling tower to the main building's existing network.
With a maximum range of about 25km, the 800m connection was completed using the basic dipole antennas supplied as standard with the radios.
The customer had the option of using its existing DCS system, but instead chose to have CMCP provide a Wonderware Intouch HMI solution installed on an industrial PC in the control room.
In another application, STI has supplied an integrated Ethernet RF solution to a US power company.
The customer wanted to monitor rolling element bearings on a coal crusher and considered the cost of conduit and wire prohibitive.
A monitoring system using a combination of CMCP530 (velocity) and CMCP590 (enveloping) transmitters was wired to a CMCP-ET-16AI 16 channel Ethernet A/D convertor.
The ADC in turn was connected to CMCP-OS2400-Ethernet industrial radios.
Once again the standard antenna was adequate for the short distance involved.
In this installation the customer will be monitoring and trending the values with its existing DCS system.
When complete, over 300 channels of vibration monitoring will be involved.
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