TI120 Series Variable Frequency Drive
System Installation and Wiring
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2.3.4 Wiring note of main circuit
1)
Input power supply R,S,T
● There is no phase sequence requirement for the input side wiring of the variable frequency
drive.
●
The specifications and installation methods of external power wiring shall conform to the
requirements of local regulations and relevant IEC standards.
● For power cable wiring, please select copper wires with corresponding sizes according to the
values in the recommendation table in chapter 2.3.3.
2)
DC bus+,-
● Pay attention to the residual voltage at the terminals (+), (-) of the DC bus just after the power
failure, and wait for the indicator lamp to turn off, and confirm that the power failure will last for 10
minutes before wiring operation, otherwise there is a risk of electric shock.
● When selecting external brake components for 160kW and above, pay attention to that the
polarity of (+), (-) cannot be reversed, otherwise the variable frequency drive will be damaged
or even fire disaster.
● Wiring length of brake unit shall not exceed 10m. Twisted pair or tight two-wire parallel wiring
shall be used.
● Do not connect the brake resistor directly to the DC bus, and it may cause damage to the
variable frequency drive or even fire disaster.
3)
Brake resistor terminals B1, B2/+
● For models with 132kW or below and confirmed to have built-in brake unit, the brake resistor
wiring terminal is valid.
● The brake resistor selection shall be selected according to the recommended value and the
wiring distance shall be less than 5m. Otherwise, the variable frequency drive may be
damaged.
4)
variable frequency drive outputs U, V, W
●
The specifications and installation methods of external power wiring shall conform to the
requirements of local regulations and relevant IEC standards.
● For power cable wiring, please select copper wires with corresponding sizes according to the
values in the recommendation table in 2.3.3.
●
Capacitors or surge absorbers shall not be connected to the output side of the variable
frequency drive; otherwise the variable frequency drive will be frequently protected or even
damaged.
● When the motor cable is too long, it is easy to generate electrical resonance due to the influence
of distributed capacitance, so it shall cause insulation damage of the motor or larger leakage
current to make the variable frequency drive over-current protection. When the length of the