Precautions For Dc Output Modules; Overcurrent Protection And Coordination For Dc Output Modules - Toshiba V Series User Manual

Chapter 3 Precautions for I/O Modules

3.3 Precautions for DC Output Modules

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(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 Specification)
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
Table 3-1 Overcurrent protection and coordination for DC output modules
Type of module
DO633/DO633P A fuse of 5A per common(16 points) is built in this DC output module.
(16-point output) 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.
DO634/DO635 The load short-circuit,etc. will cause burn-out of the module and
(32/64-point output) 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.
D: Bypasses transient overvoltage to the power supply and suppresses the voltage
between the collector and emitter of the transistor.
Protection
D
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