Toshiba Tosvert VF-AS1 - Manual (Page 228)

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(2) Do not connect two or more wires to the main circuit earth terminal of the inverter.If necessary, install an additional
earth terminal on the noise cut plate on which the inverter is installed and connect another cable to it. (Refer to Fig.
4.) See the Table 5 for earth cable sizes.
(3) Install a non-fuse circuit breaker on the input side of the inverter.
Noise cut plate
Inverter
Grounding
terminal
Install an earth terminal.
Fig. 4
9.2 Measures to be taken to satisfy the UL/CSA standards
All VF-AS1 series inverters are certified by UL and CSA, and have nameplates with UL and CSA markings.
9.2.1 Caution in installing the inverter
A UL certificate was granted on the assumption that the inverter would be installed in a cabinet. Therefore, install the
inverter in a cabinet and if necessary, take measures to maintain the ambient temperature (temperature in the cabinet)
within the specified temperature range.
For models designed for 15kW motors or smaller, if the cover on the top of the inverter is removed, the ambient
temperature can rise to 50°C in some cases, although the maximum allowable ambient temperature is 40°C.
Incidentally, models (with no cover on the top) designed for 18.5 kW motors or larger can be used at ambient
temperatures of up to 50°C.
9.2.2 Caution in wiring and rated current
For electric wires to be connected to the inverter’s input terminals (R/L1, S/L2, T/L3), output terminals (U/T1, V/T2,
W/T3) or other main circuit terminals, use UL-certified electric wires (copper wires with conductors for which the
maximum allowable temperature is 75°C or over) and round solderless terminals and tighten the terminal screws
(stripped wires may be connected directly for 200V/18.5kW to 200V/45kW models and 400V/22kW to 400V/75kW
models) to the specified torque when connecting the wires to the terminal board. To crimp a round solderless terminal
onto a wire, use a crimping tool recommended by the terminal manufacturer.
⇒ For recommended electric wire sizes, see Tables 5.
UL-certified rated output current is not the same as inverter unit rated current. Refer to Table 5.
9.2.3 Caution as to peripheral devices
When installing a no-fuse circuit breaker or a fuse box on the primary side of the inverter, use UL-certified one.
The UL certification test on this inverter was conducted under the power supply short-circuit current* conditions shown
in Table 4 (*: current that flows in the event of a short-circuit in the power supply). Note that power supply short-circuit
currents vary depending on the capacity of the motor used.
Table 4 Power supply short-circuit current and maximum input voltage
Max. input voltage (V) Applicable motor
(kW)
Power supply short-circuit current
(A) 200V class 400V class
0.4~37 5,000
45~132 10,000
160~280 18,000
355, 400 30,000
500 42,000
240 480