Rockwell Automation 825 Smart Motor Manager User Manual - Manual (Page 56)

3-23 Functions
Publication 825-UM001B-EN-P January 2001
Figure 3.10 Reduction in Permissible Motor Output Due to Voltage Asymmetry
per IEC and NEMA
Table 3.L Asymmetry (Phase Unbalance) Setting Parameters
➊ –5…60 ° C (2…140 ° F)
➋ If auxiliary relays #2 and #3 are assigned to the communication (refer to page 5-16 ) they cannot be selected
here.
High Overload and Jam
When an overload is excessively high and the motor jams, unnecessary mechanical and
thermal loading of the motor and transmission elements can be avoided by switching the
motor off immediately. This reduces consequences of accident and loss of production. A
gradual increase in overload can be detected early and reported (e.g., bearing damage). The
protective function activates as soon as the motor has started.
Warning ➊
(Current Asymmetry)
Trip ➊
Function
Factory setting Off On
Response Level
Setting range 5…80% 5…80%
Factory setting 20% 35%
Setting increments 5% 5%
Tripping Delay
Setting range — 1…25 s ± 0.2 s
Factory setting — 2.5 s ± 0.2 s
Setting increments — 0.5 s
Output Relay ➋
Selection (relays) AL, #1…#5 MR, AL, #1…#5
Factory setting AL MR
1.0
0.9
0.8
0.7
0 1 2 3 4 5
∆ U
[%]
f R f
R
Reduction factor for
motor output
∆ U Voltage asymmetry
in percent