Emerson CSI 9420, Справочное руководство

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Default alert thresholds for vibration
(continued)
Table 2-4:
Alert limits
Advise Maintenance Failed
Default value
Report
notification
Default value
Report
notification
Default value
Report
notification
Sensor
temperature 65°C
149°F
Yes
75°C
167°F
Yes
85°C
185°F
Yes
Bias
(sensor 1, 2)
– – – –
Above: >3V
Below: <2V
Yes*
Ambient
temperature
– – – –
Above: 85°C
(185°F)*
Below: -40°C
(-40°F)*
Yes*
Supply voltage <6.0 V No <5.7 V Yes <5.3 V* Yes
*These are read-only parameters and cannot be modified.
A good rule of thumb for establishing the PeakVue alert levels is to use the rule of 10's. This
applies for most rolling element bearing equipment with a turning speed between 900 and
4000 CPM. Using this approach, the Advisory alert would be set at 10 g's, the Maintenance
alert at 20 g's, and the Failed alert at 40 g's. In general, PeakVue alert levels can then be
interpreted as follows:
10 g's Indication of Abnormal Situation
20 g's Serious Abnormal Situation - Maintenance Plan Required
40 g's Critical Abnormal Situation - Implement Maintenance Plan
For more information on PeakVue, see Section 5.2 .
The default alert thresholds for temperature correspond closely to a generic open drip-
proof (ODP) motor with class F insulation and a service factor of 1.15, operating at an
ambient temperature of 40°C or below and at an altitude of 1000 meters or below . These
values are also reasonable thresholds to use when there is no knowledge of the process,
the type of machinery, or the operating environment. For more information, see
Chapter 5 .
Default alert thresholds for temperature Table 2-5:
Parameter
Advisory Maintenance Failed
Level Enabled Level Enabled Level Enabled
Temperature
149°F
(65°C)
Yes
167°F
(75°C)
Yes
185°F
(85°C)
Yes
The configurable device alerts include accelerometer bias and supply voltage. The default
settings for these alerts are shown in
Table 2-6 .
Configuration
MHM-97408, Rev 15 15