Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 339)

Section 6
Emergency STOP Design
6-3
Figure 6.2
Typical Emergency Stop Circuit
MTB PANEL
Motherboard/Processor Board
MACHINE
DRIVES ENCLOSURE
SYSTEM INSTALLER OPTIONS
Motor thermal switches
may be connected
directly
Extreme overtravel
switches
Reset
button
E-Stop
button
Contactors for E-Stop status controlled
devices (servo amp contactor, indicators,
brakes, coolant pumps, etc.)
Drive System Ready
Remote
E-Stop
button
15 V dc
from main
power supply Reduced
to 12 V dc
filter
250mA
E-Stop relay K
1
12 V dc coil
Contact ratings:
30 V dc
1.4 A
Software
controlled
E-Stop
circuit
K 1B
K 1A
1
2
3
4
5
6
7
common
Customer-supplied
dc power
CR
CR
+
--
customer supplied
fuse (size to protect K1b
contact and your E-Stop
status relay)
E-Stop status
relay
8
If your control has terminal 8, connect it
to chassis ground. If terminal 8 is not
present on your control, then this type of
grounding is not necessary.
Important: Connections to all pins on the 9/Series E--Stop
terminal are DC only. AC connection to any of these
terminals can cause damage to your 9/Series CNC.
Important: We recommend that all contactors used on the 12V E-Stop
string are rated for use at low level operation (dry circuit contactors). This
may increase initial expense of the circuit but will provide more reliable
E-Stop string operation over time. Use of non-dry E-Stop devices may
result in nuisance E-Stop faults or failure to establish a closed circuit when
the E-Stop reset push button is closed. Corrosion build-up on non-dry
contactors are not cleaned by the control’s operation. Dry contactors are
more immune to corrosive effects.
If non-dry contactor devices are used as elements of the E-Stop string, we
recommend the use of a pilot relay in conjunction with a
customer-supplied power supply operating independent of the control’s 12
Vdc string. Select a pilot relay with a dry contact rated for use in the
E-Stop string.