Diagnostics 9-3
1560D-UM051D-EN-P – February 2005
Fault Auxiliary Contact The auxiliary contact is located at terminals 29 and 30. This contact can
be programmed as either Normal or Fault. Note that the state this contact
takes upon power-up (normally open or normally closed) can be programmed.
These parameters can be found in either Basic Setup, Advanced Setup, or
the Linear List groups when modifying parameters in the Program mode.
Fault Definitions Power Loss X
Power loss indicates than 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 Y
Line fault, with the affected phase displayed, identifies three possible
pre-start conditions:
• Phase loss (Power lost to one of the phases)
• Load loss (Load connection open or has a low impedance to ground)
• Shorted SCR (SCR shorted, low impedance or premature breakover)
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 X
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 Y
Overvoltage and undervoltage protection are user-defined as a percentage
of the programmed line voltage. The SMC Dialog Plus controller continu-
ously monitors the three supply phases. The calculated average is then
compared to the programmed trip level.
X Fault occurs before gating is applied (pre-start).
Y Phase loss, overvoltage, and undervoltage protection are disabled during braking operation.
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