PROTECTIVE FUNCTIONS
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5.2.4 Acceleration/deceleration is not smooth
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Check that the acceleration and deceleration time settings are not too short.
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Check that the load is not too heavy.
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Check that the torque boost setting is not too large to activate the stall prevention
function.
5.2.5 Motor current is large
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Check that the load is not too heavy.
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Check that the torque boost setting is not too large.
5.2.6 Speed does not increase
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Check that the maximum frequency setting is correct.
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Check that the load is not too heavy. (In agitators, etc., load may become heavier
in winter.)
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Check that the torque boost setting is not too large to activate the stall prevention
function.
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Check that the brake resistor is not connected to terminals P-P1 accidentally.
5.2.7 Speed varies during operation
When slip compensation is selected, the output frequency varies with load fluctuation
between 0 and 2Hz. This is a normal operation and is not a fault.
1) Inspection of load
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Check that the load is not varying.
2) Inspection of input signal
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Check that the frequency setting signal is not varying.
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Check that the frequency setting signal is not affected by noise.
3) Others
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Check that the setting of the applied motor capacity (Pr. 80) is correct for the
inverter and motor capacities in general-purpose magnetic flux vector control.
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Check that the wiring length is within 30m in general-purpose magnetic flux
vector control.
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Check that the wiring length is correct in V/F control.
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