Genicom MatrixPrinter LA36 User Manual
Page 130
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.