G7 ASD Operation Manual 177
Control Power Undervolt age • This fault is caused by an undervoltage condition at the 5, 15, or the 24 VDC
supply.
• 3-phase input voltage low.
CPU Fault • CPU malfunction.
DC Bus Undervoltage • 3-phase input voltage low.
• Defective control board.
• Excessive load on the power supply.
• Undervoltage/Ridethrough settings require adjustment.
DC Fuse Open • Internal DC bus fuse is open.
Note: The event that caused the Trip(s) must be corrected or must decrease to less t han the threshold
value required to cause the trip to allow for a Reset to be recognized. In the event of multiple
active trips, the trip d isplayed will remain until all faults are c orrected and all tri ps are cleared.
Dynamic Braking Resistor Overcurrent • ASD inability to discharge the bus voltage during regenera tion.
• No dynamic braking resistor (DBR) installed.
• Deceleration time is too short.
• Improper D BR setup informatio n.
• Defective IGB T7 (or IGBT7 ckt. ).
• 3-phase input voltage is above specification.
Dynamic Braking Res is t o r O ve r load • Deceleration time is too short.
• DBR setting adjustment required.
• Overvoltage Stall setting adjustment required.
Earth Fault • Ground fault at the motor.
• Ground fault at the output of the ASD.
• Current leakage to Earth Ground.
EEPROM Data Fault • Internal EEPROM malfun c ti on.
EEPROM Fault • EEPROM write malfunction.
Emergency Off • Emergency Off command received via EOI or remotely.
Encoder Loss • Encoder signal missing while running during closed-loop operatio n.
Flash Memory Fault • Flash memory malfunction.
Gate Array Fault • Defective Gate Array or Gate Array malfunction.
Input Phase Loss • 3-phase input to the ASD is low or missing.
Load Drooping • Load requirement is in excess of the ca pabilities of the moto r.
Load End Short Circuit • Improper wiring at the ASD output to the motor.
Low Current • Improper Low Current detection level setting.
Main Board EEPROM Fault • Interna l E EPR O M malfunction.
Fault Screen Display Possible Causes