Vicruns 2S-0.4G-B, User Manual

Page: 39 / 300

Chapter 3 Installation
-38-
C
h
a
p
te
r
3
A.Input power L, N or R, S and T:
B.DC bus + 2 , - terminals:
C.Brake resistance connection terminal (+) and PB:
D.AC drive output side U, V and W:
E.Grounding terminal :
The connection of inverter input side has no phase sequence requirements.
At the moment of power failure,DC bus + 2 , - terminals still have residual volta-
ge, you just can touch it after internal“charge” power light is off confirming the
voltage is less than 36V, it may cause electric shock.
When you select external brake unit for AC drive ≥ 30KW, the polarity of + 2 and -
cannot be connected inversely or it will cause damages to ACdrive, or even fire
hazard.
The wiring length of brake unit shall not be more than 10m, and only twisted pair or
tight double-line is available in parallel.
Brake resistance cannot be connected onto DC bus directly, or it may cause damag-
es to AC drive, or even fire hazard.
AC drive ≤ 22KW and built- in brake unit.
The recommended value of brake resistance model selection reference and wiring
distance shall be less than 5m, or it may cause damages to AC drive.
AC drive output side shall not be connected to capacitor or surge absorber, or it
will frequent protection of AC drive, or even damages.
When the cable of motor is overlong, the effects of distributed capacitance will
generate electric resonance easily, and give rise to dielectric breakdown of motor.
The generated large leakage current makes AC drive suffer overcurrent protection. If
cable length is more than 100m,alternating current output reactor shall be installed.
Terminals must have been reliable ground connection,and resistance value ofground
wire shall be less than 4
Ω , or it will cause abnormal work of equipment,and even
damages.
Grounding terminal and null line N terminal of power supply cannot be shared.
3.5.3 Attentions of wiring