CV500-SLK21 datasheet(77/182 Pages) OMRON

77 / 182 page

If the leakage current is less than 1.3 mA, there should be no problem. If the leak-

age current is greater than 1.3 mA, determine the value and rating for the bleed-

er resistor using the following formulas.

I = leakage current in mA

7.2

2.4 x I - 3

R =

W max.

W =

2.3

W min.

where

I = leakage current in mA

R = Bleeder resistance (k

W = Bleeder resistor wattage (W)

Output Units

Output Short Protection

Output devices and Output Units can be damaged if the load connected to an

output terminal is shorted. Attach a fuse to the output circuit to protect your sys-

tem. A fuse is recommended even if the Output Unit is provided with an internal

fuse (e.g., Transistor and Triac Output Units), to increase easy of maintenance

and provide extra protection.

Interlock Circuits

When the PC controls an operation such as the clockwise and counterclockwise

operation of a motor, provide an external interlock such as the one shown below

to prevent both the forward and reverse outputs from turning ON at the same

time.

MC2

MC1

00501

00502

MC1

MC2

Motor clockwise

Motor counterclockwise

Interlock circuit

This circuit prevents outputs MC1 and MC2 from both being ON at the same

time. Even if the PC is programmed improperly or malfunctions, the motor is pro-

tected.

Output Leakage Current

If a transistor or triac Output Unit is used to drive a low voltage load, the leakage

current may prevent the output device from turning OFF. To prevent this, con-

nect a bleeder resistor in parallel with the load as shown in the following table.

Load power supply

OUT

COM

Bleeder resistor

Select the bleeder resistor using the following formula.

EON

where

I = leakage current in mA

R = Bleeder resistance (k

Eon = ON voltage of the load

Wiring I/O Units

Section 3-5

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