Holip HLP-A Series, Instruction Manual

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HLP-A Series
HLP-A Series
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88
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XI. Selection of Peripheral Devices and
Disposition
1. Options
Description Functions
NFB or Ground f ault
inter r upter f or wire
connection
Protect the wiring of the inverter. Be sure to install
a breaker at the power. Please select a ground fault
circuit interrupter against high-order harmonics.
E l e c t r o m a g n e t i c
contactor
In order to prevent the braking resistor f rom
burning out, please add an electromagnetic
contactor and connect a surge absorber to the coil
when using it.
Surge absorber
Absorb the switching surge current f rom the
electromagnetic contactor and control relays.
Isolating transformer
Its f unction of isolating the input and output of the
inverter is effective to reduce the interference to
other electric devices.
DC reactor Improve the input power factor of the inverter.
AC reactor
Improve the input power factor of the inverter and
prevent the shock of surge voltage.
Braking resistor, braking
unit
Consume the regenerating energy of the motor and
shorten the ramp-down time.
1) Leakage switch
There is earth static capacity inside of the inverter and the motor as well as
the input and output leads. Due to higher carrier frequency of the inverter the
inverter has higher earth leakage current, especially for the inverters of large
capacity series. When using a leakage switch it may sometimes result in the
error action of the protective circuit. So when using a leakage switch attention
should be paid to its selection and the proper reduction of carrier f requency
and shortening the leads, etc.
2) AC reactors
An AC reactor can constrict the high-order harmonic of input current of the
inverter to improve its input power factor and prevent the shock of surge. It is
recommended to use an input AC reactor under the following circumstances:
a～Three-phase power supply is in unbalance.
b～Any equipment with thyristor or power factor compensation unit with
switching control is connected to the same power supply.