Rockwell Automation 825 Smart Motor Manager User Manual - Manual (Page 131)

Testing and Maintenance 7-5
Publication 825-UM001B-EN-P January 2001
Checking with Test Equipment
A complete check of the Smart Motor Manager’s components can be performed with the test
unit and a 3-phase current source.
Test Unit
With the test unit, all protective functions set on the Smart Motor Manager can be checked,
including the pickup levels and tripping delays.
Test with 3-Phase Current Source
Using a 3-phase current source, the main circuit, any primary current transformer, and the
current detection module, Cat. No. 825-MCM, can be tested.
Because the functions of the Smart Motor Manager have already been checked with the test
unit, it is sufficient to supply a current of 1 x I
e
(after approximately 60 min. the thermal
utilization reaches 83%). As an alternative, you can measure the 3-phase currents exactly and
compare the readings with the values indicated by the LCD on the Smart Motor Manager.
Figure 7.1 Test with a 3-Phase Current Source
ATTENTION
!
This test should be performed only by qualified personnel.
825-MCM 825-M
1 3 5
2 4 6
A
M
3 ~
3-phase ,
e
,
e
Measurement of phase currents
Connections
(if current < rated motor current:
e.g., 20 A when using 825-MCM180