Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 648)

Section 13A
Connecting 8520 Digital Drive Systems
13A-14
This section discusses faults and how they are detected on the 8520 digital
servo amplifier.
System Ready Faults
The system checks that the servo amplifier is ready using two methods:
System Ready Connector (TB3)
The System Ready (on TB3) contact makes sure that the control board of
the servo amplifier is ready, the power circuit of the DC bus is ready, and
the system relay is closed.
Table 13A.C
System Ready Contact Ratings
DC AC
24V dc @ 1.4 A (max. 30 W) 230V ac @ 1.4 A (max. 30 W)
Axis status output (CNA1, CNA2, and CNA3)
The Axis status output contact is connected to the servo module and is
checked by the servo module’s CPU on a per axis basis. If this contact is
not active, the servo module recognizes that the amplifier is in a fault
condition and sends the message “SERVO AMPLIFIER FAULT” sent to
the control. This is pre-wired through servo cable CN20.
LED Indicators
Table 13A.D through Table 13A.F lists the symbol, indication, and color of
the 8520 digital servo amplifier fault and ready status indicators (note the
LED indicators are numbered on the 3AX-D servo amplifier).
Table 13A.D
1AX-D (1 axis) Servo Amplifier Indicators
Symbol Fault or Ready Indication Color
OT Over Temperature Red
UV Bus Undervoltage Yellow
OC Over Current Red
AXF Axis 1 Fault Red
RDY System Ready Green
OV Bus Overvoltage Red
CVF Control Voltage Fault Red
EAX1 Axis 1 Enable Green
13A.4
8520 Digital Servo Amplifier
Fault Indicators
Circuit
breaker
TB3
TB1
TB4
CNA1
TB2
Location of
LEDs