SKF CMSS 785 Series, User Manual

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2.2 Applications
When suitably installed and combined with an appropriate (IMx) monitoring system, it is pos-
sible to measure the vibration of a rotating shaft, its eccentricity, (thrust) position, rotating
speed or to provide phase data etc.
The unit aims to facilitate continuous measurement or monitoring of shafts rotating at either
high or low speeds, across a range of machine types. This unit is not designed for use in any
other application.
2.3 Permissible system combinations
The unit can be provided as either a 5 or 9 m system. This refers to the total, nominal, cable
length being used irrespective of whether this is made up solely of probe cable or probe and
extension cabling. In each case an appropriate 5 or 9 m driver completes the system. Only the
component combinations shown in the graphic below are allowed.
CMSS 75 or
CMSS 78 probe
+
CMSS 985
extension cable
=
System
cable
length
→ CMSS 785 driver
A B C
0,5 m + 4,5 m = 5 m
→
CMSS 785-11/-12
1,0 m + 4,0 m = 5 m
→
CMSS 785-11/-12
5,0 m – = 5 m
→
CMSS 785-11/-12
0,5 m + 8,5 m = 9 m
→
CMSS 785-21/-22
1,0 m + 8,0 m = 9 m
→
CMSS 785-21/-22
9,0 m – = 9 m
→
CMSS 785-21/-22
A B C
Any excess cable is typically coiled and tied, and doing so does not affect the measurement
capability or performance of the system.
NOTE
Performance specifications for the system are presented in Appendix A, noting that a
non-functioning/non-conforming system will result from:
• Any combination of system components that results in a system length that is not 5 or 9 m.
• A 5 m driver being used in a 9 m system (or vice versa).
• The shortening or lengthening of the cable between the probe and driver.
• The inclusion of any non-CMSS 785 system components, including from earlier SKF
systems.
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