Veichi AC100-T3-1R5G Manual page 79

AC80C HIGH-PERFORMANCE VC INVERTER MANUAL
0-phase Reactor
⑧
0-phase reactor is used for reducing the electromagnetic interference of the inverter, suitable for the input side and
output side of the inverter. It's the equal of a three-phase common mode choke. In actual use, according to the actual
magnetic core size and cable specification, 3-5 circles winding ratio are recommended to bring the best performance.
Braking Resistor or Braking Unit
⑨
Consumption unit of renewable electricity, see Chapter 3, Section 6 "electric installation".
Heat Relay
⑩
Please install heat relay at the output side of the frequency inverter. When the motor enters into overload state, the heat
relay would cut the power source to protect the motor. When using one frequency inverter to drive one motor, it is
unnecessary to install heat relay. The motor overload protection current [FA.20] of the frequency would work as a
protection. When using one frequency inverter to drive multiple motors or the motor is driven directly by the power grid,
please install heat relay between the inverter and the motor. When installing the heat relay, please design to cut the
sequence control circuit of the MC at the main loop input side by the connection spot of the relay or design to input the
heat relay action into the frequency inverter as external malfunction. And please pay attention to the following tips to
avoid heat relay malfunction and motor overheating at low speed.
Run at low speed:
Multiple motors running in one frequency inverter
Motor cable is very long
Detect malfunction mistakenly because the carrier frequency is too high.
Low Speed and Heat Relay
In normal cases, the heat relay is suitable for universal motor. When using the frequency inverter to run the universal
motor (standard motor), the motor current would increase 5-10%, compared with the commercial power supply. Besides,
at low speed, even in the motor rated current range, the cooling capability of the fan drove by the motor axis would
reduce. And this would lead to motor overheat. So please set the motor overheat protection current [FA.20] of the
frequency inverter to be valid.
When Motor Cable Is Long
When the motor cable is long and the carrier frequency is high, impacted by the leakage current, the heat relay may
malfunction. To avoid it, please reduce the carrier frequency or set higher detection value of the heat relay. Before
increasing the detection value, do confirm if there's any other cause for the motor overheat. Otherwise, there might be
danger.
PERIPHERAL EQUIPMENTS AND OPTIONS
76