Sanken Samco SVC06, Инструкция по эксплуатации, Страница: 24 / 136

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4-2 About Wiring
4-2 About Wiring
Before carrying out wiring work, turn the inverter’s input power supply to ―OFF‖ (disconnected) first, and
then check with a circuit tester that no applied voltage is present. Check also that the CHARGE lamp is not
lit.
(1) Be sure to connect a MCCB (circuit breaker) between the power supply and the input power supply
terminals (R, S, T). (Use a leakage circuit breaker specific to high-order harmonic when necessary.)
In addition, to ensure the system safety, connect a MC (magnetic contactor) between the MCCB and
the input power terminals (R, S, T).
(2) The phase order does not need to be considered when wiring the input power terminals (R, S, and
T).
(3) Connect the motor to the output terminals (U, V, W) correctly.
The harmonic component leakage current increases by stray capacitance of wiring and causes adverse affects
on the inverter itself and peripheral mechanical equipment when the total length of wiring between inverter
and motor is too long.
The total length of wiring between inverter and motor shall not exceed the values described in Table 4-1.
Table 4.1 Length of wiring between the inverter and the motor
Length of wiring between
the inverter and the motor
50m 100m 200m
Carrier frequency
(Specified by F1009)
F1009=130 or less F1009=90 or less F1009=40 or less
●
When driving several motors at the same time, the total length of wiring to motors shall not exceed the values
described in Table 4-1. However, for vector control, the maximum wiring length shall be controlled within
100m. (For length of more than 30m, please implement auto tuning mode2)
●
The surge voltage generated by the inverter element switching is superimposed and terminal voltage of the
motor is impressed. The following measures should be considered to prevent deterioration of motor isolation
especially for 400V class motors when the length of wiring between the inverter and the motor is long.
①
Use reinforced motor isolation.
②
Length of wiring between the inverter and the motor should be as short as possible (Generally about 10
- 20m) .
(4) See 4-5-4 for capacity of MCCB and MC and wire sizes.
Use sleeved crimp terminals for the power and motor cables.
(5) Use shielded or twisted-pair wires for wiring to the control circuit terminals. Keep the wires well
away from the main and high-voltage circuits (including logic circuit of 200 V relay).
(6) Use a micro-signal contact or two-contact relay for the control circuit terminal to prevent poor
contact.
(7) Ground the ground terminal ( ) securely.
In addition, use the ground terminal of the inverter for grounding. (Do not use the casing or the chassis.)
According to technical standards for electrical equipment, 200 V series shall be connected to the grounding
electrode for type D grounding; while 400 V series connected to the grounding electrode for type C
grounding.
Table 4-2 Types of grounding
Voltage Types of grounding Grounding resistance
200V series Type D grounding
100Ω or less
400V series Type C grounding
10Ω or less