Mitsubishi Electric 800 Series Instruction Manual page 56

2
Output short-circuit fault (E.SCF)
Select the reset operation and fault indication for an output short-circuit.
Pr. Name
521 Output short-circuit
H194 detection
• The fault indication for an output short-circuit (E.OC1 to E.OC3, and E.SCF) can be changed by the Pr.521
setting.
• When an output short-circuit is detected while Pr.521 = "1", E.SCF is displayed and the inverter output is shut off.
• When E.SCF occurs while Pr.521 = "1", E.SCF can be reset only by turning OFF the control circuit power. (E.OC1
to E.OC3 can be reset by any reset method.)
• This restriction prevents the inverter from being damaged due to repeated reset operations by the other methods
such as entering the RES signal.
• When E.SCF occurs, the output short-circuit detection (ALM4) signal can be output.
• For the terminal used to output the ALM4 signal, set "23" (positive logic) or "123" (negative logic) in any of Pr.190
to Pr.196 (Output terminal function selection).
• If the automatic bypass switching after inverter fault is enabled (Pr.138 is not set to "1"), the operation is not
switched to the commercial power supply operation even when E.SCF occurs.
Operation panel
indication
Name
Description
Check point
Corrective action
NOTE
• When short-circuit resistance is large, the current does not reach the short-circuit detection level. In such a case,
an output short-circuit cannot be detected.
• Changing the terminal assignment using Pr.190 to Pr.196 (Output terminal function selection) may affect the
other functions. Set parameters after confirming the function of each terminal.
• E.SCF does not activate the retry function.
• E.SCF is not cleared by turning ON the Fault clear (X51) signal.
• If E.SCF occurs during emergency drive operation, the output is shut off.
• The communication data code for E.SCF is 20 (H14).
Initial
value
0
0
1
E.SCF
Output short-circuit fault
The inverter output is shut off when an output short-circuit is detected while Pr.521 = "1". When Pr.521
= "0" (initial value), E.OC1, E.OC2, or E.OC3 appears when an output short-circuit is detected.
Check for output short-circuit.
Check the wiring to make sure that any output short circuit does not occur, then turn OFF the control
circuit power to reset the inverter.
Setting range
Operation after detection
E.OC1 to E.OC3
E.SCF
FR-LU08
indication
2
Description
Reset method
Not restricted
Restricted
Fault
BCN-C22005-996