Rockwell Automation 57C570 AutoMax PC3000 User Manual - Manual (Page 246)

BĆ2
1 2 G
not used
G
L
N
Control Transformer Filter PC3000
Surge Suppressor
IN OUT
Figure B.1 Ć Connecting a Grounded Control Transformer Secondary
If the control transformer secondary is ungrounded, two surge protectors are
required: one for the lineĆtoĆline and one for lineĆtoĆground protections. Connect
the first surge protector wire labeled terminal 1 or 2 to one of the filter input
terminals. Connect the surge protector's ground wire to the other filter input
terminal. Connect the second surge protector's wires labeled 1 and 2 to the filter
input terminals. Connect the second surge protector's ground wire to the
protective ground. Make these wires as short as possible. See figure B.2.
1 2 G
G
L
N
Control Transformer Filter PC3000
Surge Suppressor 2
1 2 G
not used
Surge Suppressor 1
IN OUT
Figure B.2 Ć Connecting an Ungrounded Control Transformer Secondary