Diagnostics
9-3
Fault Definitions
Power Loss
Power loss indicates that an input power phase is not present. The
controller’s LCD display will identify the missing phase.
Note:
If all three phases are absent when a start command is issued,
the LCD will display “Starting” without motor rotation.
Line Fault
①
Line fault with the affected phase displayed identifies three possible
pre-start conditions.
•
Phase loss
•
Load loss
•
Shorted SCR
Line fault with no phase indication is displayed when one of the
following conditions occurs while the SMC Dialog Plus controller is
in the run mode.
•
Phase loss
•
Load loss
•
Shorted SCR
Phase Reversal
Phase reversal is indicated when the incoming power to the SMC
Dialog Plus controller is in any sequence other than ABC. This pre-
start protective feature can be disabled.
Overvoltage and Undervoltage Protection
①
Overvoltage and undervoltage protection are user-defined as a
percentage of the programmed line voltage. The SMC Dialog Plus
controller continuously monitors the three supply phases. The
calculated average is then compared to the programmed trip level.
①
Phase loss, overvoltage, and undervoltage protection are disabled during braking operation.
Summary of Contents for SMC Dialog Plus
Page 46: ...2 20 Installation ...
Page 78: ...4 14 Programming ...
Page 149: ...9 6 Diagnostics ...
Page 157: ...10 8 Troubleshooting Figure 10 3 Removal of Control Module 180 360A 1 3 2 4 ...
Page 169: ...A 6 Specifications ...
Page 179: ...C 4 Renewal Parts ...