EQ7 Series Instruction Manual - TECO-Westinghouse Motor Company

The table below shows the conditions for zero speed control to be enabled or disabled.
At startup
At stop
Speed command Run command Data for d24 Operation
OFF ― Stop (Gate OFF)
Below the starting and
0 Stop (Gate OFF)
stop frequencies
ON
1 Zero speed control
Below the stop
ON ― Zero speed control
frequency
OFF ― Stop (Gate OFF)
• Stop Frequency (Detection mode) (F38) (Under vector control with speed sensor)
F38 specifies whether to use the detected or reference speed as criterion to shut down the inverter output. Usually
the inverter uses the detected speed. However, if the inverter undergoes a load exceeding its capability, e.g., an
external excessive load, the motor cannot stop so that the detected speed may not reach the stop frequency level.
When such a situation arises, select an appropriate speed that can reach the stop frequency level even if the
detected speed does not, in order to stop the inverter without fail for general fail-safe operation.
- Data setting range: 0 (Detected speed)
1 (Reference speed)
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