Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 657)

Section 13A
Connecting 8520 Digital Drive Systems
13A-23
Figure 13A.1
Power Distribution from the Supply to the Transformer and Amplifier
Dynamic Brake
circuitry (shunt
resistor, fuse,
contactor).
Refer to drives
interface section.
Motor
A-B 1389
transformer 3
8520 digital
Servo Amplifier
Internal
drive logic
fuse
E
System
ready
Main power supply
Customer power
supply (24V dc)
9/260 and 9/290 4
115V ac
Fuse size
based on
customer
needs
Customer
transformer
Disconnect Switch
C1
C1
C1
P1
C1
Contactors 2 Fuse 1
3 Æ 230V ac
R
S
T
3A
3A
E-Stop Function
11194-I
1 Main power circuit fuse sizing is determined by the following equation:
Fuse capacity (A) = (Tr) x 974.3
V
Where:
Tr = Transformer size calculated on page 13A-12 (in kW)
V = minimum 3 phase input voltage (V ac)
2 Contactor sizing is such that its capacity is greater than that of the fuses.
3 Refer to section 4.2 to size the transformer.
4 May not be necessary on PS2 24V is part of the power supply.
E-Stop Status
Relay Contact