Toshiba 6F3B0253 user manual O Application Precautions

6F3B0253

3. I/O Application Precautions

(3)Over-current protection

The output circuit of the T1-16S does not contain protective fuses. Fuses rated for the output should be provided by the user.

T1 output

Load

Load

PS Fuse appropriate to

the common current

(4)Output surge protection

Where an inductive load is connected to the output, a relatively high energy transient voltage will be generated when the relay turns OFF. To prevent the problems caused by this surge, install a surge absorber in parallel to the inductive load.

T1 output circuit

Surge absorber:

Load

PS

Surge absorber

•Flywheel diode (for DC output)

Inverse withstand voltage: At least three times that of the power supply

Forward current: Larger than the load current

•Varistor (for AC output)

The voltage rating is 1.2 times the maximum (peak) voltage of the power supply

•CR snubber (for DC or AC output)

R: 0.5 to 1Ω per volt coil voltage

C: 0.5 to 1∝ F per ampere of coil current (non-polarity capacitor)

Basic Hardware and Function 51