2.4 Connection diagrams and terminal functions
2.4.3 Multi-drive system connection diagrams
2.4.3.1 Direct parallel connection
In direct parallel connection, two or more inverter units drive one single-winding motor. Up to three inverter units can be connected in direct parallel connection.
For more information, refer to "9.4 Direct parallel connection system" in Chapter 9.
<Relay sequence>
Auxiliary control power input
PGP PGM PA PB SS,E
(Note 9) TH1 THC
NTC thermistor (Note 5)
FU FV
FW MF
PG Auxiliary fan
power input
Grounding terminal P
N
FRENIC-VG Master Stack
<INV1>
T1 R1 T0 R0
DC/DC Charge lamp
(Note 4)
Voltage detector G
Processing controller
(PA) (PB)
〔TH1〕
〔THC〕
Speed/
magnetic-flux position detector
U V W G
Gate driver
Current detector
ACR
(PGP) (PGM) Auxiliary fan
power input
Grounding terminal P
N F
FRENIC-VG Slave Stack
<INV2>
T1 R1 T0 R0
DC/DC Charge lamp
(Note 4)
Voltage detector G
Processing controller
(PA) (PB)
〔TH1〕
〔THC〕
Speed/
magnetic-flux position detector
U V W G
Gate driver
Current detector
ACR
(PGP) (PGM)
OPC-VG1-TBSI
【TX】
【RX】
E U1 V1 W1 Stack fan
power input
Optical fiber cable
(Note 14)
FTX 30C
30A
<INV1>
30 30C
30A
<INV2>
30
Y5C
Y5A
<INV2
>
RDY Y5C
Y5A
<INV1>
RDY
RDY
FWD REV
RDY
FX RX
Relay output Ready-to-run RDY Alarm output (for any alarm) (30A,30B,30C) 30A
30B 30C Y5A Y5C (FWD
) (REV) (X7 BX) (CM) FX
RX FTX
Thermal relay Transformer
(Note 9) FU
FV FW Motor fan power input
Relay output Ready-to-run RDY Alarm output (for any alarm) (30A,30B,30C) 30A
30B 30C Y5A Y5C (FWD
) (REV) (X7:BX) (CM) FTX
U2 V2 W2
M 3～
(Note 11)
0V (Note 10)
0V DCF1
DCF2
DCF1 DCF2
(Note 15) (Note 16)
(Note 3)
(Note 6)
(Note 6)
(Note 5)
(Note 15) (Note 7)
(Note 16) (Note 7)
Digital input
(Note 15) (Note 7)
(Note 16) (Note 7)
(Note 3)
(a) U2 V2 W2
(a)
0V (Note 10)
0V (Note 6)
(Note 6)
OPC-VG1-TBSI
【TX】
【RX】
Ec R MCCB S T Main power input
To other inverter stack Power panel
(Note 13) (Note 1)
PWM converter system PWM converter
Filter MC1
Fan power input MFR MFS MFT
(Note 2) R0
73 Diode rectifier (Note 13)
(Note 18) F
(Note 17)
F F (Note 17) MC1
Signal input sectionSignal input section
(Note 19)
(Note 1) For wiring protection, install the converter-specific recommended circuit breaker (MCCB) or earth leakage breaker (ELCB) (with an overcurrent protection feature) on the input side (i.e., the primary side) of the converter. Ensure that the circuit breaker capacity is equivalent to or lower than the recommended capacity.
(Note 2) Aside from the MCCB or the ELCB, install the converter-specific recommended electromagnetic contactor (MC) as necessary as it will be used when disconnecting the power supply from the converter. Connect a surge absorber in parallel when installing a coil such as an MC or solenoid near the inverter.
(Note 3) To retain an alarm output signal issued on inverter's programmable output terminals by the protective function or to keep the keypad alive even if the main power has shut down, connect these terminals to the power supply lines. Without power supply to these terminals, the inverter can run.
(Note 4) Connect to the fan power supply terminals for cases above 90 kW.
(Note 5) A grounding terminal for a motor. It is recommended that the motor be grounded via this terminal for suppressing inverter noise.
(Note 6) For wiring enclosed with , use twisted or shielded wires. In principle, the shielded sheath of wires should be connected to ground. If the inverter is significantly affected by external induction noise, however, connection to may be effective to suppress the influence of noise.
Keep the control circuit wiring away from the main circuit wiring as far as possible (recommended: 10 cm or more). When crossing the control circuit wiring with the main circuit wiring, set them at right angles.
(Note 7) The connection diagram shows factory default functions assigned to digital input terminals [X1] to [X9], transistor output terminals [Y1] to [Y4], relay contact output terminals [Y5A/C], analog output terminal [AO1] to [AO3], and analog input terminals [Ai1] and [Ai2].
(Note 9) The motor cooling fan voltage differs from motor to motor. Add a transformer as needed.
(Note 10) are insulated inside the inverter unit.
(Note 11) Use the auxiliary contact (manual reset) of the thermal relay to trip the MCCB or MC.
(Note 13) Available converters include diode rectifiers and PWM converter types. Additionally, selection of recommended peripherals matching the converter to be used is necessary. Refer to "Chapter 6 Converter System" for details.
(Note 14) Direct parallel connection requires the optional high-speed serial communication support terminal block (OPC-VG1-TBSI). The option comes with an optical cable (5 m).
If the optical cable in use is bent (at a curvature of 35 mm or smaller), an alarm (Inter-inverter communications link error: erb) may occur. Lay the optical cable at a curvature of 35 mm or greater.
(Note 15) For the safety, configure the sequence circuit that causes all inverters running in direct parallel connection to coast to a stop (BX signal) when an inverter failure (heavy alarm) occurs. Do not assign BX signal via the communications link.
(Note 16) Configure the circuit that inputs a run command after the inverter ready-to-run signals on all inverters running in direct parallel connection are established. A run command and reset signal are valid only when they are entered to the master inverter. (There is no problem with them if entered via the communications link.) (Note 17) Be sure to use the fuse (F). Use the fuses on the P (+) side for the 400V series or on both the P (+) and N (-)
sides for the 690V series.
(Note 18) When a motor is run in a direct parallel connection system, there is a restriction on the wiring length between the inverter and motor.
Refer to "9.4.8 Wiring inductance" and ensure that the wiring length between the inverter and motor is greater than the minimum wiring length.
(Note 19) When used in combination with a PWM converter, be sure to connect the PWM converter and inverter auxiliary power input terminals (R0, T0) to the main power via contact b of the power supply electromagnetic contactor (MC1). This is not necessary if used in combination with a diode rectifier. When using the product with a non-grounded power supply, it is necessary to add an insulated transformer.
For more information, refer to item (5) in section "6.3.15".
SpecificatiChapter 2
2.4.3.2 Multiwinding motor drive
Multiwinding motor drive system controls a special motor having more than one winding.
An inverter unit per motor winding is required. Generally, this system applies when VG7 or older inverter series are updated. (Vector control with a speed sensor is the only system which can be applied.)
<Relay sequence>
Auxiliary control power input
PGP PGM PA PB SS,E TH1 THC
NTC thermistor (Note 5)
FU FV
FW MF
PG Auxiliary fan
power input
Grounding terminal P
N
FRENIC-VG Master Stack
<INV1>
T1 R1 T0 R0
DC/DC Charge lamp
(Note 4)
Voltage detector G
Processing controller
(PA) (PB)
〔TH1〕
〔THC〕
Speed/
magnetic-flux position detector
U V W G
Gate driver
Current detector
ACR
(PGP) (PGM) Auxiliary
fan power input
Grounding terminal P
N F
FRENIC-VG Slave Stack
<INV2>
T1 R1 T0 R0
DC/DC Charge lamp
(Note 4)
Voltage detector G
Processing controller
(PA) (PB)
〔TH1〕
〔THC〕
Speed/
magnetic-flux position detector
U V W G
Gate driver
Current detector
ACR
(PGP) (PGM)
E U1 V1 W1 Optical
fiber cable (Note 14)
FTX 30C
30A
<INV1>
30 30C
30A
<INV2>
30
Y5C
Y5A
<INV2>
RDY Y5C
Y5A
<INV1>
RDY
RDY
FWD REV
RDY
FX RX
Relay output Ready-to-run RDY Alarm output (for any alarm) (30A,30B,30C) 30A
30B 30C Y5A Y5C (FWD
) (REV) (X7 BX) (CM) FX
RX FTX
Thermal relay Transformer
(Note 9) FU
FV FW Motor fan power input
Relay output Ready-to-run RDY Alarm output (for any alarm) (30A,30B,30C) 30A
30B 30C Y5A Y5C (FWD)
(REV) (X7:BX) (CM) FTX
(Note 11)
0V (Note 10) 0V DCF1
DCF2
DCF1 DCF2
(Note 15) (Note 16)
(Note 3)
(Note 6)
(Note 6)
(Note 5)
(Note 15) (Note 7)
(Note 16) (Note 7) (Note 15)
(Note 7)
(Note 16) (Note 7)
(Note 3)
0V (Note 10)
0V (Note 6)
(Note 6) U2 V2 W2
M 3～
OPC-VG1-TBSI
【TX】
【RX】
OPC-VG1-TBSI
【TX】
【RX】
Stack fan power input Ec
R MCCB S T Main power input
To other inverter stack (Note 13) (Note 1)
PWM converter system PWM converter
Filter MC1
Fan power input MFR MFS MFT
(Note 2) R0
73 Diode rectifier (Note 13)
F (Note 18)
F F (Note 18) MC1
Power panel
Signal input sectionSignal input section
Digital input
(Note 19)
(Note 1) For wiring protection, install the converter-specific recommended circuit breaker (MCCB) or earth leakage breaker (ELCB) (with an overcurrent protection feature) on the input side (i.e., the primary side) of the converter. Ensure that the circuit breaker capacity is equivalent to or lower than the recommended capacity.
(Note 2) Aside from the MCCB or the ELCB, install the converter-specific recommended electromagnetic contactor (MC) as necessary as it will be used when disconnecting the power supply from the converter. Connect a surge absorber in parallel when installing a coil such as an MC or solenoid near the inverter.
(Note 3) To retain an alarm output signal issued on inverter's programmable output terminals by the protective function or to keep the keypad alive even if the main power has shut down, connect these terminals to the power supply lines. Without power supply to these terminals, the inverter can run.
(Note 4) Connect to the fan power supply terminals for cases above 90 kW.
(Note 5) A grounding terminal for a motor. It is recommended that the motor be grounded via this terminal for suppressing inverter noise.
(Note 6) For wiring enclosed with , use twisted or shielded wires. In principle, the shielded sheath of wires should be connected to ground. If the inverter is significantly affected by external induction noise, however, connection to may be effective to suppress the influence of noise.
Keep the control circuit wiring away from the main circuit wiring as far as possible (recommended: 10 cm or more). When crossing the control circuit wiring with the main circuit wiring, set them at right angles.
(Note 7) The connection diagram shows factory default functions assigned to digital input terminals [X1] to [X9], transistor output terminals [Y1] to [Y4], relay contact output terminals [Y5A/C], analog output terminal [AO1] to [AO3], and analog input terminals [Ai1] and [Ai2].
(Note 9) The motor cooling fan voltage differs from motor to motor. Add a transformer as needed.
(Note 10) are insulated inside the inverter unit.
(Note 11) Use the auxiliary contact (manual reset) of the thermal relay to trip the MCCB or MC.
(Note 13) Available converters include diode rectifiers and PWM converter types. Additionally, selection of recommended peripherals matching the converter to be used is necessary. Refer to "Chapter 6 Converter System" for details.
(Note 14) Multiwinding motor drive requires the optional high-speed serial communication support terminal block (OPC-VG1-TBSI). The option comes with an optical cable (5 m).
(Note 15) For the safety, configure the sequence circuit that causes all inverters driving a multiwinding motor to coast to a stop (BX signal) when an inverter failure (heavy alarm) occurs. Do not assign BX signal via the communications link.
(Note 16) Configure the circuit that inputs a run command after the inverter ready-to-run signals on all inverters driving a multiwinding motor are established. A run command and reset signal are valid only when they are entered to the master inverter. (There is no problem with them if entered via the communications link.)
(Note 18) Be sure to use the fuse (F). Use the fuses on the P (+) side for the 400V series or on both the P (+) and N (-) sides for the 690V series.
(Note 19) When used in combination with a PWM converter, be sure to connect the PWM converter and inverter auxiliary power input terminals (R0, T0) to the main power via contact b of the power supply electromagnetic contactor (MC1). This is not necessary if used in combination with a diode rectifier. When using the product with a non-grounded power supply, it is necessary to add an insulated transformer.
For more information, refer to item (5) in section "6.3.15".
SpecificatiChapter 2