Rockwell Automation 825 Smart Motor Manager User Manual - Manual (Page 82)

3-49 Functions
Publication 825-UM001B-EN-P January 2001
Application
• Local indication for continuous supervision of the load on motor and installation.
• Load control: With the indication of the momentary temperature rise of the machine,
the load on the installation can be continuously controlled to the maximum
permissible temperature rise of the motor. The result is optimal utilization of the
motor with full protection and maximum productivity of the driven installation.
• Automatic load control by a controller or inverter drive (e.g., for charging mills and
crushers; the Smart Motor Manager itself is unable to protect inverter-driven motors).
Figure 3.28 Analog Output for Motor Temperature Rise
Thermal utilization calculation:
10 15
4
5
17.2
20 mA
ϑ
ϑ
K
ϑ
G
ϑ
max
ϑ
Temperature rise of motor
ϑ
max
Permissible temperature limit (tripping threshold)
ϑ
G
Nominal temperature (load ,
e
)
ϑ
K
Coolant temperature (40 °C or via PT100 #7)
Therm utiliz (%)
…mA 4 mA ± ( )
16 mA
-------------------------------
100% • =