Chapter 7 Peripheral Equipments
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7.2.4 Leakage current protector
Because safety capacitor or distributed capacitance to earth exists in interior of ac drive
and motor and in the input or output leading wires, and higher carrier frequency is used
for low noise, the leakage current of the ac drive is to high, obvious in large capacity
machine. Sometimes, it may lead defective action of protective circuit.
If you encounter problems above, except lessening carrier frequency and shortening
leading wire, you have to mount leakage current protector:
Mount leakage current protector at the input terminal (come after MCCB)
Current action level (with ac drive) must be ten times more than the total leakage current
(without ac drive) of circuit, ratio noise filter and motor, etc.
7.2.5 Capacitor Box
The capacitor box is particularly applied in the circumstance requiring continuous duty
when the power-off is relative long (more than 20ms).
You can order from our company, please specify the actual load, the required continuous
duty time after power-off when you place the order, so that our company can prepare you
the product.
As the capacitance box may influence some parameters in your machine after it is
assembled, the preparation by the user is not recommended.
