Allen-Bradley SLC 500 1747-L20 Instrucciones De Instalación página 20

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20 SLC 500™ Fixed Hardware Style Controllers
The following diagram shows an output with a suppression device. We recommend
that you locate the suppression device as close as possible to the load device.
If you connect an SLC 500 controller dc output to an inductive load, we
recommend that you use a 1N4004 diode for surge suppression, as shown in the
illustration that follows.
Relay or Solid State
dc Outputs
Suitable surge suppression methods for inductive ac load devices include a varistor,
an RC network, or an Allen-Bradley surge suppressor, all shown below. These
components must be appropriately rated to suppress the switching transient
characteristic of the particular inductive device.
Output Device
Varistor
Publication 1747-IN008B-MU-P
+ dc or L1
VAC/VDC
OUT 0
OUT 1
OUT 2
ac or dc
OUT 3
Outputs
OUT 4
OUT 5
OUT 6
OUT 7
COM
+24V dc
VAC/VDC
OUT 0
OUT 1
OUT 2
OUT 3
OUT 4
OUT 5
OUT 6
OUT 7
COM
Surge Suppression for Inductive ac Load devices
Output Device
Snubber
24V ac common
RC Network
dc COM or L2
1N4004 Diode
Output Device
Surge
Suppressor