User Manual Owner's manual

Rockwell Automation Publication 280E-UM001B-EN-P - July 2012 227
Troubleshooting Chapter 10
higher than expected. This fault is disabled when Parameter 182 (DB1 Resistor
Sel) is “Disabled”.
Troubleshooting – DB1 monitor has measured a DB1 current lower 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 Switch Fault
Control Supervisor Object “DB1 Fault” Attribute Bit 3.
A DB1 Switch fault is issued when continuous DB1 resistor current is detected
when the Drive Bus Voltage level is less than the DB1 Voltage Level. If 5
consecutive samples of Drive Bus Voltage less than DB1 Level is detected along
with continuous DB1 resistor current flow, then a shorted DB1 IGBT fault
(DB1 Switch) is recorded.
It is the user’s responsibility to provide an input power contactor to each
ArmorStart with a drive. The user must write logic to control (open) the input
contactor to the ArmorStart in the event of a DB1 Switch Fault. The Instruction
Literature provides information on how to connect the input contactor, and how
to implement the logic.
Troubleshooting – Attempt to reset the fault by removing all power to the unit
and restarting. If the fault persists, replace control module.
DB1 Open Fault
Control Supervisor Object “DB1 Fault” Attribute Bit 4.
A DB1 Open fault is issued when Bus Voltage is greater than the DB1 Voltage
Level, and no DB1 resistor current has been detected. If 5 consecutive samples
of Drive Bus Voltage greater than the DB1 Level is detected along with no DB1
resistor current flow, then an open DB1 fault is recorded. This fault is intended
to notify the customer of an open DB1 resistor, or open wire. The fault is disabled
when the DB1 Resistor Sel, Parameter (182) is “Disabled”.
Troubleshooting – DB1 monitor expected to see current flow and measured
none. Likely cause is an open DB1 resistor, loose DB1 resistor connector, or open
wire in DB1 cable. Check DB1 cable connector for tightness. If problem persists,
remove DB1 resistor cable connector from unit and check DB1 resistance. If
DB1 resistor is open, replace DB1 resistor. Otherwise replace control module.