Rockwell Automation 284E ArmorStart with EtherNet/IP - User Manual - Manual (Page 226)

226 Rockwell Automation Publication 280E-UM001B-EN-P - July 2012
Chapter 10 Troubleshooting
The DB1 option provides the following warning:
• DB1 Thermal Warning
DB1 Resistor Overtemperature Fault
Control Supervisor Object “DB1 Fault” Attribute Bit 0.
The DB1 measures current continuously, and models resistor body temperature
based on measured current and resistor model parameters. The DB1 not only
calculates the present resistor body temperature, but also predicts the future
resistor body temperature. The resistor overtemperature level is based on the
predicted future resistor body temperature, not on the present resistor body
temperature. This fault is disabled when Parameter 182 (DB1 Resistor Sel) is
“Disabled”.
Troubleshooting – DB1 Resistor body temperature is too hot. Allow resistor
to cool.
DB1 Overcurrent Fault
Control Supervisor Object “DB1 Fault” Attribute Bit 1.
The DB1 compares each current measurement against the Max Current Level. If
5 consecutive samples are above the Max Current Level, then a fault is recorded.
This fault is intended to notify the user if the DB1 resistance is lower than
expected. This fault is disabled when Parameter 182 (DB1 Resistor Sel) is
“Disabled”.
Troubleshooting – DB1 monitor has measured a DB1 current higher than
expected. Turn off all power to unit. Allow at least 3 minutes for capacitors to
discharge. Disconnect DB1 resistor from ArmorStart control module. Caution:
DB1 resistor may still be hot.
Measure DB1 resistor value at the connector with
an ohmmeter. Refer to the specification for minimum DB1 resistor values. If DB1
resistance value is within limits, replace control module. If not, replace DB1
resistor.
DB1 Undercurrent Fault
Control Supervisor Object “DB1 Fault” Attribute Bit 2.
The DB1 compares each current measurement against the Min Current Level.
The Min Current Level = Min DB1 Voltage Level/Max DB1 Resistance. If 5
consecutive samples are below the Min Current Level and the DB1 is ON, then a
fault is recorded. This fault is intended to notify the user if the DB1 resistance is