User Manual

Logic Interface Options
Appendix A
A-14
If solid state switches are used, the leakage current rating of the switch
must be verified. In some instances a burden resistor may be required in the
switch circuit to help ensure correct circuit operation.
• For solid state switches with a leakage current less than 1mA, a burden
resistor is not required.
• For solid state switches with a leakage current rating of 1-5mA, a 2.5kΩ,
10W burden resistor must be used in each solid state switch circuit.
2.5kΩ
User 115V AC Supply
EARTH
GROUND
User
Solid State Switch
User
Burden Resistor
Terminals 21, 25 or 29Terminals 19, 20, 22, 23, 24, 26, 27, 28 or 30
• For solid state switches with a leakage current rating greater than 5mA,
contact your nearest Allen–Bradley Drives Distributor of Sales Office
for assistance.
!
ATTENTION: Burden resistors are physically hot when
solid-stated switches are energized. This is a normal operating
condition. Touching the resistors can cause burns or injury.