Shenzhen Hpmont Technology Co., Ltd Chapter 4 Electrical Installation
HD20 Series Inverters User Manual ―17―
Chapter 4 Electrical Installation
4.1 Wiring Precautions
• Only qualified electrical engineer can perform wiring job.
• Only when the power supply switch is completely off can you do the wiring job.
• You can’t open the inverter cover to do wiring operation until the power is cut-off 10 minutes later.
Do not wire or detach the inverter internal devices at power-on situation.
• Do not do wiring operation until the internal charge indicator of the inverter is off and the voltage
between (+) and (-) of the main circuit terminals is below 36V.
• Check the wiring carefully before connecting emergency stop or safety circuit.
• The earth terminal PE of the inverters must be reliable earthing. It must use two separate earth wire
due to the leakage current from the inverter to ground.
• It must use Type B mode when utilize earth leakage protection devices(ELCB/RCD).
• Do not touch the wire terminals of the inverter when it is live. The main circuit terminals is neither
allowed connecting to the enclosure nor short-circuiting.
• Do not do dielectric strength test on the inverter.
• Do wiring connection of the braking resistor or the braking unit according to the wiring figure.
• Make sure the terminals are fixed tightly.
• Do not connect the AC supply cable to the output terminals U/V/W of the inverter.
• Do not connect the phase-shifting capacitors to the output circuit.
• Be sure the inverter has ceased output before switching motor or change-over switches.
• The inverter DC bus terminals must not be short-circuited.
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