HNC Electric HRS Series, Руководство по эксплуатации

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8. Precautions of Use and Daily Maintenance for HRS
8.1 Precautions for application use
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Prevent electric shock
After the input terminal of the HRS soft starter is connected to the power supply, when the load is open circuit or phase
loss, even in the stopping state, the output terminal will still have a fairly high induced voltage. Do not touch the output
terminal of the soft starter, otherwise there will be a risk of electric shock.
The control circuit board of HRS soft starter has a voltage of 380V, which may cause electric shock during commissioning.
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Induced voltage
The induced voltage at the output end of the HRS soft starter at no load is normal and does not affect the use. The
induced voltage is generated by the leakage of the RCR (solid-state semiconductor devices such as thyristor, GTR, IGBT,
etc. have varying degrees of leakage) and the AC path of the dv/dt resistance-capacitance filter circuit. Use a voltmeter to
measure zero, about 100~220V (related to the internal resistance of the voltmeter). The load capacity of this induced
voltage is very small and disappears after the output is connected to the load.
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Compensation capacitor
The reactive power compensation capacitor used to improve the power factor must be connected to the input end of the
HRS soft starter, and must not be connected to the output end, otherwise it will damage the SCR power device in the soft
starter.
●Megohmmeter
Do not use a megohmmeter to measure the insulation resistance between the input and output of the HRS soft starter,
otherwise the SCR and control board of the soft starter may be damaged due to over-voltage.
A megohmmeter can be used to measure the phase-to-phase and phase-to-ground insulation of the HRS soft starter, but
three short-circuit wires should be used to short-circuit the input and output terminals of the three phases in advance, and
unplug all plugs on the control board.
When measuring motor insulation, the above principles should also be followed.
●Input and output
Do not connect the input and output terminals of the main circuit of the HRS soft starter in reverse, otherwise it will cause
unexpected actions of the soft starter and may damage the soft starter and motor.
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Bypass phase sequence
When using a bypass contactor, the phase sequence of the starting circuit should be consistent with the phase sequence
of the bypass circuit, otherwise a phase-to-phase short circuit will occur during bypass switching, causing the air circuit
breaker to trip and even damage the equipment.
●
Low voltage level
The 7, 8, 9, 10, and 11 terminals use internal working voltage, and other external power supplies must not be connected to
these terminals, otherwise the internal circuit of the soft starter will be damaged.
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Working voltage level of soft starter
13, 14 terminals use external AC380V working voltage, do not connect other voltage levels to these terminals. Otherwise,
the internal circuit of the soft starter will be damaged.