Toshiba VT130G1 - Manual (Page 15)

Section 5
WIRING
Refer to Figures 5-1 and 5*2, Standard Connection Diagram, Table 2, Standard Wire
Size, and Table 3, Inverter Rating Chart and use the following instructions. When wiring
the unit, the front cover of the inverter must be removed. The method of front cover
removal is shown on page 68.
1. Be careful not to apply commercial voltage to output terminals (U, V, or W). This
will damage the unit.
2. A surge suppressor must be connected across the excitation coil of the electro­
magnetic contactor (MC) when used. Recommended surge suppressor: MARCON
Electronics DCR-10A25 (or RC type, .luf, 400V, 5000, V4W).
3. Grounding wire size at terminal E must be 3.5 mm2 or greater (#10 gauge).
4. Match the power supply voltage to the control power input terminals.
5. Use shielded, twisted wires for external connections of speed reference signals
(CRF, REF, IRF, OV) and also remote meter signals (FM. CM, OV).
6. Use a DC 1 mA meter for frequency and current meter. A 20 K ohms variable
resistor is needed for the ammeter scale calibration.
7. Connect either F (forward) or R (reverse) terminal to ST terminal through the
RUN/STOP switch. If there are two input signals from both F and R, F (forward)
command will override the reverse. The DRIVE-SW (RUN-STOP) on the operation
panel is connected to F (forward), therefore to perform reverse operation without
switching, two of the output terminal connections (U. V. and VV) must be inter­
changed. if F (fonward) or R (reverse) is to be controlled externally, switch the
DRIVE-SW lead on the operation panel between F (tonward) and R (reverse).
8. When the standard integral operation panel is included and also a remote operators
station is to be used, the frequency reference signals from the integral operation
panel and the remote operation panel cannot be used at the same time. In such
case, disconnect the operation panel controls, or install a local/remote switch.
9. The 4 to 20 mA current input signal is not isolated in the inverter control circuit.
Toshiba recommends that signal common not be grounded since noise problems
may result.
10. CAUTION:
if auzillary contacts of the Main Contactor are not used, an external jumper must be
installed between EC1 and EC2, connect control power to the secondary of the input
contactor MC. Lost of input power will cause the FREQ/Fault display to go blank. Do
Not install a jumper between ST and COM on power units 7.5HP and above. This will
permanent!/ damage soft charge circuitry if EC1 and EC2 have not been wired in
accordance with the Instruction Manual.
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