VD500 Series Inverter User Manual Mechanical and Electrical Installation
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Table 3-1 the peripheral devices
Breaker
Must install the isolation switch device such as a obvious
segmentation between the grid and frequency inverter, and ensure the
personal safety when equipment maintenance.
The capacity of breaker is 1.5~2 time of frequency inverter rated
current, the time characteristic of breaker should fully consider the
time characteristic of the frequency inverter overload protection.
Leakage breaker
Due to the output of the inverter is high speed pulse voltage, so there
is a high frequency leakage occurred; when install leakage breaker in
the input end of the frequency inverter, please select special type B
leakage breaker, the leakage current set value is 300mA.
Delay type fuse
In North America, must use delay type fuse(FUSE current rating value
is 225% max load output current) before inverter, avoid the
breakdowns and expanded because the equipment failure. Please
refer to table 3-2 selection fuse.
Contactor
Frequently closed and disconnect contactor will cause inverter fault,
the highest frequency is no more than 10 times/min. When using
braking resistance, in order to prevent damage of breaking resistance
is overheating, please install the braking resistance overheat detection
of thermal protection relay, through thermal protection relay contact
control contactor disconnect power supply side.
Input AC reactor or DC
reactor
1.
Inverter power supply capacity is greater than 600kVA.
2.
On the same power source node has switch type reactive power
compensation capacitor or with silicon controlled phased load,
will produce a lot of peak current, could lead to converter part
components damage.
3.
When the inverter three-phase power supply voltage unbalance
is more than 3%, has the potential to cause converter part
components damage.
4.
To improve the power factor of the input side of the inverter.
If above situation occurs, please access AC reactor in the
frequency inverter input side or install DC reactor in bus side.
Thermal protection
relay
Although the inverter motor with overload protection function, but
when an inverter driving two or more motor or driven multi pole motor,
in order to prevent overheating of the motor accident, please install
thermal protection relay in the converter and each motor and the
motor overload protection F8-00 parameter is set to “1” (motor
protection is disabled)
Output AC reactor
When the connect wire between inverter and motor more than 100m,
suggest install AC output reactor that can suppress high frequency
oscillation, to avoid motor insulation damage, leakage current is large
and the inverter frequency protection.
Braking assembly
The dotted box type G type 15kW and the following models built in
braking unit, did not elicit P1 terminal; G type 18.5kW and above
models without built-in braking unit, no elicit PB terminal.
Protective earth
The memory of the leakage current of inverter, in order to ensure the
safety of the inverter and motor must grounding, grounding resistance
should be less than 10Ω. The grounding wire should be as short as
possible, wire diameter should conform to table 3-3 standard.
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