Rockwell Automation 1784-KTXD Manuel d'utilisateur Page 68

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Publication 1747-UM011F-EN-P - May 2007
68 System Installation Recommendations
Determining the Date of the SLC 500 Series A Chassis
The date of the chassis is found within the serial number imprinted on
the chassis nameplate on the right side of the chassis.
Master Control Relay
A hard-wired master control relay (supplied by you) provides a
convenient means for emergency controller shutdown. Since the
master control relay allows the placement of several emergency-stop
switches in different locations, its installation is important from a
safety standpoint. Overtravel limit switches or mushroom head push
buttons are wired in series so that when any of them opens, the
master control relay is de-energized. This removes power to input and
output device circuits.
Place the main power disconnect switch where operators and
maintenance personnel have quick and easy access to it. If you mount
a disconnect switch inside the controller enclosure, place the switch
CAT
MADE IN U. S. A.
SLC 500
RACK
SER
U
L
A
1746 - A7
SERIAL NO.
A7 -1195A1357
SA
®®
Month
Year
Right Side
ATTENTION
Never alter these circuits to defeat their function, since serious
injury and/or machine damage could occur.
IMPORTANT
If you are using a dc power supply, interrupt the dc side rather
than the ac side to avoid the additional delay of power supply
turn-on and turn-off. The dc power supply should receive its
power directly from the fused secondary of the transformer.
Connect the power to the dc input and output circuits through a
set of master control relay contacts.
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