
11-5
Trips and Fault Finding
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames E & F
6511
Keypad
Display
6901
Keypad
Display
Description
Possible Reason for Trip
OC
OVERCURRENT
The motor current being
drawn from the drive is too
high
♦
Trying to accelerate a large inertia load too quickly
♦
Trying to decelerate a large inertia load too quickly
♦
Application of shock load to motor
♦
Short circuit between motor phases
♦
Short circuit between motor phase and earth
♦
Motor output cables too long or too many parallel
motors connected to the drive
♦
Fixed or auto boost levels are set too high
STO
SAFE TORQUE OFF Safe Torque Off (STO) is
active.
♦
One or both STO user inputs is low
♦
A fault has been detected in the STO circuit
HOT
HEATSINK
The drive heatsink
temperature is too high
♦
The ambient air temperature is too high
♦
Poor ventilation or spacing between drives
ET
EXTERNAL TRIP
User trip caused via control
terminals
♦
+24V not present on external trip (terminal X15/05)
♦
Check setting of EXT TRIP MODE parameter
IN 1
INPUT 1 BREAK
I/O TRIPS:: INPUT 1
BREAK has gone True
♦
Check configuration to determine source of signal