5-91
In the diagram above, f1 is the level of the analog frequency command sampled at any given time. The sampling is
repeated at regular intervals to continually monitor the wiring connection of the analog frequency command.
- Data setting range: 0 (Decelerate to stop), 20 to 120%, 999 (Disable)
Avoid an abrupt voltage or current change for the analog frequency command. An abrupt change may be
interpreted as a wire break.
Setting E65 data at "999" (Disable) allows the
REF OFF signal ("Reference loss detected") to be issued, but
does not allow the reference frequency to change (the inverter runs at the analog frequency command as
specified).
When E65 = "0" or "999," the reference frequency level at which the broken wire is recognized as fixed is "f1
× 0.2."
When E65 = "100" (%) or higher, the reference frequency level at which the wire is recognized as fixed is "f1
× 1."
The reference loss detection is not affected by the setting of analog input adjustment (filter time constants:
C33, C38, and C43)
E78, E79
E80, E81
Torque Detection 1 (Level and Timer)
Torque Detection 2/Low Torque Detection (Level and Timer)
E78 specifies the operation level and E79 specifies the timer, for the output signal TD1. E80 specifies the operation
level and E81 specifies the timer, for the output signal
TD2 or U-TL.
Operation level Timer
Output signal Assigned data
Range: 0 to 300% Range: 0.01 to 600.00 s
TD1 46 E78 E79
TD2 47 E80 E81
U-TL 45 E80 E81
Torque detected 1 -- TD1, Torque detected 2 -- TD2
The output signal TD1 or TD2 comes ON when the torque value calculated by the inverter or torque command exceeds
the level specified by E78 or E80 (Torque detection (Level)) for the period specified by E79 or E81 (Torque detection
(Timer)), respectively. The signal turns OFF when the calculated torque drops below "the level specified by E78 or E80
minus 5% of the motor rated torque." The minimum ON-duration is 100 ms.
Low output torque detected--U-TL
This output signal comes ON when the torque value calculated by the inverter or torque command drops below the level
specified by E80 (Low torque detection (Level)) for the period specified by E81 (Low torque detection (Timer)). The
signal turns OFF when the calculated torque exceeds the "level specified by E80 plus 5% of the motor rated torque."
The minimum ON-duration is 100 ms.
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