Toshiba PROSEC T1 User Manual page 68

3. I/O Application Precautions
(3) Over-current protection
The output circuit of the T1/T1S does not contain protective fuses. Fuses rated for the
output should be provided by the user.
(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.
Surge absorber:
· Flywheel diode (for DC output)
· Varistor (for AC output)
· CR snubber (for DC or AC output)
66
T1/T1S User's Manual
CTi Automation - Phone: 800.894.0412 - Fax: 208.368.0415 - Web: www.ctiautomation.net - Email: info@ctiautomation.net
T1
output
circuit
Fuse appropriate to
the common current
T1
output
circuit
Inverse withstand voltage: At least three times that of the power supply
Forward current: Larger than the load current
The voltage rating is 1.2 times the maximum (peak) voltage of the power supply
R: 0.5 to 1 W per volt coil voltage
C: 0.5 to 1 mF per ampere of coil current (non-polarity capacitor)
Load
Load
PS
Load
Surge absorber
PS
6F3B0250