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Product Information | How to Expand the Capacity Range of the Inverters (Stack Type)

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How to Expand the Capacity Range of the Inverters (Stack Type)
How to Expand the Capacity Range of the PWM Converters (Stack Type)

How to Expand the Capacity Range of the Inverters (Stack Type)

Direct parallel connection system and multiwinding motor drive system are provided for driving a large capacity motor.

System		Direct parallel connection system	Multiwinding motor drive system
Features	Drive motor	Single-winding motor	Multiwinding motor (Exclusive use for multiwinding motors)
	Restriction of wiring length	The minimum wiring length (L) varies with the capacity.	There is no particular limit.
	Reduced capacity operation (Note2)	Available	Available (However, the wiring should be switched over.)
Number of inverters to be connected		2 to 3 inverters	2 to 6 inverters
Arrangement diagram		When 2 inverters are connected	When 2 inverters are connected

Note1: OPC-VG1-TBSI is separately required.

Note2: Reduced capacity operation. If a stack fails in case of direct parallel connection, the operation continues with lower output power using the stacks that have not failed.

Example) If one inverter fails when 200kW x 2 inverters are driving a 355kW motor, the operation can continue with the 200kW inverter (capacity of one inverter).

Note: To start the reduced capacity operation, consideration is needed to the switch over operation of PG signals or motor constants and sequence circuit. For details, refer to the operation manual.

Configuration table for direct parallel connection

2 or even 3 inverters of the same capacity can be connected in parallel to increase capacity or facilitate system redundancy. Typical combinations are shown in Table 1, however, other configurations are also possible.

Table 1 Direct parallel combination example (400V series, MD specification)

Connection system	Standard stack				Stack by phase
Connection system
Capacity [kW]	Applicable inverter	Applicable inverter	No. of units	Current [A]	Applicable inverter	Applicable inverter	No. of units	Current [A]
30	FRN30SVG1
37	FRN37SVG1
45	FRN45SVG1
55	FRN55SVG1
75	FRN75SVG1
90	FRN90SVG1
110	FRN110SVG1
132	FRN132SVG1
160	FRN160SVG1
200	FRN200SVG1
220	FRN220SVG1
250	FRN250SVG1
280	FRN280SVG1
315	FRN315SVG1
355		FRN200SVG1	2	716
400		FRN220SVG1	2	789
500		FRN280SVG1	2	988
630		FRN220SVG1	3	1183	FRN630BVG1
710		FRN280SVG1	3	1482	FRN710BVG1
800		FRN280SVG1	3	1482	FRN800BVG1
1000						FRN630BVG1	2	2223
1200						FRN630BVG1	2	2223
1500						FRN800BVG1	2	2812
1800						FRN630BVG1	3	3335
2000						FRN710BVG1	3	3905
2400						FRN800BVG1	3	4218