Terminal Functions And Wiring Order - Fuji Electric frenic-hvac Instruction Manual

2.2.4 Terminal functions and wiring order

Main circuit terminals and grounding terminals
The table below shows the order of wiring and terminal functions. Carry out wiring in the order shown below.
Table 2.4 Order of Wiring and Functions of Main Circuit Terminals
Classifi- Order of
Name
cation wiring
1
Primary grounding
terminals for inverter
enclosure
Secondary grounding
2
terminals for motor
Inverter output terminals U, V, W
Main
circuit
3
(Note)
DC link bus terminals
4
Main circuit power input
terminals
5
Auxiliary control power
input terminals
6
Control
Control circuit terminals
circuit
(Note) Do not make wiring to empty main circuit terminals (NC). For details about the terminal block, refer to
Section 2.2.3 "Terminal arrangement diagrams and screw specifications."
To make the machinery or equipment compliant with the EMC standards, wire the motor and inverter in
accordance with the following.
(*1) Use shielded wires for the motor cable and route the cable as short as possible. Firmly clamp the shield to the
specified point inside the inverter.
(*2) When wiring the main circuit power input lines of the inverters of 11 to 37 kW, be sure to pass them through a ferrite
core.
When shielded wires are not used for the motor cable, remove the motor cable clamps to prevent the
cable covering from getting damaged, which makes the machinery or equipment incompliant with the
EMC standards. Removing a ferrite core from the input lines in wiring does not affect inverter running.
(
For details about wiring, refer to Chapter 8, Section 8.3 "Compliance with EMC Standards."
Control circuit terminals
Table 2.5 Names, Symbols and Functions of the Control Circuit Terminals
Classifi-
Name
cation
Power supply for the
potentiometer
Analog setting voltage input
Analog setting current input
Analog
input PTC thermistor input
Analog setting voltage input
Analog common
Symbol
Two grounding terminals (
power supply wiring (primary circuit) or motor wiring
G
(secondary circuit). Be sure to ground either of the two
grounding terminals for safety and noise reduction.
Connect the secondary grounding wire to the grounding
G
terminal ( G).
Connect the three wires of the 3-phase motor to terminals
U, V, and W, aligning the phases each other.
A DC link bus is connectable to these terminals.
P(+), N(-)
When you need to use the DC link bus terminals P(+) and
N(-), consult your Fuji Electric representative.
The three-phase input power lines are connected to these
terminals. (*2)
L1/R, L2/S,
L3/T
If the power wires are connected to other terminals, the
inverter will be damaged when the power is turned ON.
Connect the same AC power as for the main circuit to these
R0, T0
terminals as a control circuit power backup.
Route the wiring of the control circuit as far from that of the
main circuit as possible. Otherwise, electric noise may
cause malfunctions.
See Table
2.5.
When the Enable function is not to be used, short-circuit
terminals [EN1] and [PLC] and terminals [EN2] and [PLC]
using jumper wires.
Symbol
[13] Power supply for an external frequency command potentiometer
(Variable resistor: 1 to 5kΩ)
[12] External voltage input that commands the frequency externally.
[C1] External current input that commands the frequency externally.
Connection of a PTC (Positive Temperature Coefficient) thermistor
for motor protection.
[V2] External voltage input that commands the frequency externally.
[11] Common terminal for analog input signals.
2-5
Functions
G) are not exclusive to the
(*1)
Functions