Toshiba SX 2000 - Manual (Page 134)

3.3 Precautions for DC Output Modules
3.3 Precautions for DC Output Modules
(1) The DC output module needs an external 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.
(2) Protection coordination against over-current of DC output module
Type of module Protection
D0633/D0633P
(16-point output)
A fuse of 5A 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 DC output module and the
external cable from burn-out.
D0634/D0635
(32/64-point output)
The load short-circuit,etc. will cause burn-out of the module and
external cable,because a protection fuse is not built in this DC output
module. Therfore, install an appropriate fuse on the outside to prevent
accidental burn-out.
(3) A diode as shown in the figure below is built in to protect the transistor from
transient overvoltage.
I
j
-é-
I
-CZF
D: Bypasses transient overvoltage to the power supply and suppresses the
voltage between the collector and emitter of the transistor.
(4) Pay attention to the following cases caused by the diode mentioned in (3).
<Case 1 >
When connecting to the external equipment in which DC power supply
is provided from internal, if the voltage of P1 is higher than one of P2
or if P2 turns to OFF when P1 is ON, the external equipment may turn
to ON in spite of the output status.
Because a load current flows through D:a diode.
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