Caution, Toshiba, 0 l h – Toshiba VF-SX User Manual
Page 119
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11-12
TOSHIBA
TABLE 11-7: ELECTRONIC PROTECTION PARAMETERS
[ 0 L H ]
Value
Function
0
standard motor, without stall capability.
1
standard motor, with stall capability.
S
VF motor, without stall capability. I
3
VF motor, with stall capability. 1
Explanation of the soft-stall function:
If the inverter detects an overload, the output frequency and voltage are
automatically lowered before overload tripping can occur. Operation continues
without tripping at the frequency where the load current is balanced. This
parameter is typically applicable to variable torque type loads such as fans,
pumps, and blowers, etc. where the load current decreases when the operation
speed decreases.
CAUTION:
Do not apply the stall function to constant torque characteristic loads
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Electronic Thermal
Operation Level
Output Frequency
Figure 11.4 Standard Motor
Electronic Thermal Operation
Characteristics
Electronic Thermal
Operation Level
Maximum
Frequency
Output Frequency
Figure 11.5 VF Motor Electronic
Thermal Operation Characteristics