Toshiba TOSVERT VF-AS3 User Manual

E6582062
2. Installation and wiring 2-70
2
9
■ Influence of leakage current across lines (in case of CT and ammeter)
If a CT and ammeter are connected externally to detect inverter output current, the leak current's
high frequency component may destroy the ammeter. If the wires are long (50 m or more) or in case
of models with motors of low rated current (several A (ampere) or less), especially the 480 V class
low capacity (4.0 kW or less, 5.5 kW or less with ND) models, it will be easy for the high frequency
component to pass through the externally connected CT and be superimposed on and burn the
ammeter, because the ratio of leakage current against the motor's rated current will increase.
Here are some examples of measures against leakage current across lines.
• Connect the ammeter to the terminal [FM] and terminal [AM] of the inverter.
For how to connect the meter and how to set parameters, refer to [5. 3. 6].
• Check the current value with the monitor function.
For details, refer to [8. 1. 1].
• Set <F300: Carrier frequency> to 5 kHz or less.
However, this may increase noise on the motor side.
For details, refer to [6. 14].

Toshiba TOSVERT VF-AS3 Specifications

General

Model	TOSVERT VF-AS3
Category	Inverter
Overload Capacity	150% for 60 seconds
Cooling Method	Forced Air Cooling
Control Method	V/f control, Sensorless vector control
Braking Unit	Built-in
Communication Protocols	Modbus RTU, DeviceNet, Profibus DP
Protection Functions	Overcurrent, Overvoltage, Undervoltage, Overheat, Ground Fault
Enclosure	IP20
Operating Temperature	-10°C to +50°C
Humidity	5-95% (non-condensing)
Altitude	Up to 1000m