Inovance MD880 Series - Page 62

3 Electrical Installation
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Table 3-2 Main circuit terminals of the MD880 series AC drive
Terminal Symbol Terminal Name Function
R, S, T
Three-phase power
input terminals
Connected to the three-phase AC power
supply.
(+), (-)
DC bus positive and
negative terminals
Common DC bus input, connected to the
external braking unit for AC drives of 90 kW
and above
(+), BR
Terminals for
connecting braking
resistor
Connected to the external braking resistor for
AC drive of 75 kW and below
U, V, W
AC drive output
terminals
Connected to the three-phase motor.
Ground (PE) terminal Must be grounded.
2) Main circuit cable selection
It is recommended that symmetrical shielded cables be used as the input and output
main circuit cables. Compared with the quad-core cable, the symmetrical shielded
cable can reduce electromagnetic radiation of the whole transmission system.
Recommended power cable type ― symmetrical shielded cable:
1&
1&DPOEVDUPSDPSF
BOETIJFME
4IJFME 4IJFME
1&
Figure 3-17 Recommended power cable type
Non-recommended power cable type:
PE
4IJFME
Figure 3-18 Non-recommended power cable type
3) Input power R, S, T
■
The cable connection on the input side of the AC drive has no phase sequence
requirement.
■
The speci󶍾cations and installation method of external main circuit cables must
comply with local regulations and related IEC requirements.