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External frequency selection
I am considering to perform multi-speed operation in the external operation mode.
RH (60 Hz), RM (40 Hz), RL (20 Hz), and no analog frequency setting input are used.
When the machine output goes faulty and all of the RL, RM, and RH input signals are turned OFF, how does the inverter behave?
1. If these signals are turned OFF during operation, does the inverter decelerate to stop? Does it continue operation? Is the inverter fault output generated?
2. What happens if all signals are OFF before the inverter starts and then the STF input is turned ON?
RH (60 Hz), RM (40 Hz), RL (20 Hz), and no analog frequency setting input are used.
When the machine output goes faulty and all of the RL, RM, and RH input signals are turned OFF, how does the inverter behave?
1. If these signals are turned OFF during operation, does the inverter decelerate to stop? Does it continue operation? Is the inverter fault output generated?
2. What happens if all signals are OFF before the inverter starts and then the STF input is turned ON?
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Answer
When all of the multi-speed input signals are turned OFF during external operation, the output frequency conforms to the external analog frequency command (inputs 2 to 5 or inputs 4 to 5).
Therefore, if the analog frequency setting input is not present (is "0"):
For the case 1, the inverter decelerates and outputs 0 Hz.
(If Pr.13 (Starting frequency) is set to higher than 0 Hz, output is not generated.)
In this case, no fault output is generated.
If Pr.2 (Minimum frequency) is set, the inverter operates at the minimum frequency.
For the case 2, the inverter also outputs 0 Hz.
Similarly to the case 1, if Pr.2 (Minimum frequency) is set, the inverter operates at the minimum frequency.
Therefore, if the analog frequency setting input is not present (is "0"):
For the case 1, the inverter decelerates and outputs 0 Hz.
(If Pr.13 (Starting frequency) is set to higher than 0 Hz, output is not generated.)
In this case, no fault output is generated.
If Pr.2 (Minimum frequency) is set, the inverter operates at the minimum frequency.
For the case 2, the inverter also outputs 0 Hz.
Similarly to the case 1, if Pr.2 (Minimum frequency) is set, the inverter operates at the minimum frequency.
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- Inverter, magnet motor drive
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