8-11
8.6.4 ECF alarm (caused by logic discrepancy) and inverter output state
Figure 8.8 shows the timing scheme to apply when EN1 and EN2 inputs are not concordant, so that an alarm
ECF occurs.
Turning the emergency stop button ON turns EN1 and EN2 inputs OFF, which usually brings the inverter into the
Safe Torque Off (STO) state. If the discrepancy of the EN1 and EN2 inputs is within 50 ms, no alarm occurs; if it
is longer than 50 ms, the inverter interprets it as a logic discrepancy, outputting the alarm ECF. The alarm can
be cleared by restarting the inverter.
To diagnose the EN terminals circuit appropriately, when turning EN1/EN2 inputs ON and OFF, keep the ON and
OFF time for at least 2 s.
Input to EN1
Run
Run command
Inverter output
ON
OFF
Running
Emergency stop
button
OFF ON
Stop
Safe Torque Off
(STO)
Input to EN2
ON
OFF
50 ms
ECF
alarm
No alarm Alarm issued
50 ms
ON
OFF
OFF
Power OFF
OFF
ON
ON
Power ON
No alarm Alarm issued
Safe Torque Off
(STO)
>=2s
>=2s
Figure 8.8 ECF Alarm (Caused by Logic Discrepancy) and Inverter Output State
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