Toshiba Programmable Controller PROSEC T3 - Manual (Page 61)

3. Precautions for I/O Modules
3.3
Precautions for DC
output modules
(1) The DC output module needs an externa! power supply to drive
output transistors. For each common, connect the load power to
the appropriate terminal. (For details, see 2.3, I/O module
specifications)
If the wrong polarity of the power supply to the terminal is
connected, the module will be damaged. Check the polarity
before connection.
For the D0333 and D0334 modules, if their built-in fuse is
blown out or if the external power supply is not supplied, the
front LED (FL, FH) of the module lights.
(2) Protection coordination against over-current of DC output
module
Type of module
D0333
<16-point output)
Protection
A fuse of 6 A per common (8 points) is built in mis DC
output module. For an overload and load short-cir
cult, the transistor will not be protected. This fuse,
however, protects the DC output module and the
D0334
(32-point output)
external cable from burn-out.
A fuse of 6 A per common (16 points) is built in this DC
output module. For an overload and load short-circuit,
the transistor will not be protected. This fuse, however,
protects the nrodule and the external cable from bum-
D0335
(64-point output)
out.
Because a protection fuse is not built in this DC output
module, the load short-circuit, etc. will cause bum-out
of the module and external cable, Therefore, install an
appropriate fuse on the outside to prevent accidental
bum-out.
(3) A diode as shown in the figure below is built in to protect the
transistor from transient overvoltage.
D: Bypasses transient overvoltage to the power supply and
suppresses the voltage between the collector and emitter of the
transistor.
User's manual - Hardware
53