Genicom MatrixPrinter LA36 User Manual

Page 130

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5-43

b.

Secondary circuit protection

Overcurrent protection (OCP)

If a short circuit occurs at the load, overcurrent protection starts for the current range below (Table 5.3) to

prevent the current from increasing, thus lowering output voltage.

Table 5.3 Overcurrent protection

Protection

Foldback

Foldback

Overcurrent detection

1.0 A or more

4.3 A or more

Voltage

+5 V

+34 V

Overvoltage protection (OVP)

If a malfunction occurs in the power control system, the following protection starts to prevent overvoltage at the

output (Table 5.4).

Table 5.4 Overvoltage protection

Voltage

+5 V

+34 V

Action

If +5 V output reaches +6 V or more, the overvoltage protection circuit in the internal
power unit detects the overvoltage and turns off the main switching circuit.

The *PWSTOP signal goes high to turn off the main switching circuit if the logic circuit
detects that the +34 V output is over +39 V. Then +5 V and +34 V outputs are turned off.

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