PRODUCTS

Our drivers support 5V signal input as standard. When 12V or 24V signals are input over the range described in the manual, an external resistor must be added as shown in the diagram on the left.

The external resistance is calculated as follows:
・Input forward current of the photocoupler: ＩＦ
・Input forward voltage of photocoupler: ＶＦ

(Internal resistance + External resistance) x ＩＦ + ＶＦ
= Input voltage
↓
External resistance
= (Input voltage - ＶＦ ) / ＩＦ - Internal resistance


Substituting the following values into this formula
- Forward current ＩＦ = 12mA
- Photocoupler input forward voltage ＩＦ = 1.5V
- Internal resistance 82 + 180 = 262Ω
(for the resistance value shown in the diagram)

The external resistance value is as follows.
・Input voltage = 12V　External resistance
  = 613Ω → 620Ω recommended
・Input voltage = 24V　External resistance
= 1613Ω → 1.6KΩ recommended


Note: Depending on the model and production date, there may be products with an internal resistance value of 270Ω or 390Ω. In this case, calculate as above or refer to the table on the left.

To prevent burnout, use 1/2W type external resistors.‌ ‌