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Step-by-Step Basic Installation
Inverter Mounting
and Installation
2–14
Determining Wire
and Fuse Sizes
This section includes tables for 200V class and 400V class inverters (on the next page). The
following notes will help you read the tables in this section:
• Locate the row corresponding to the motor size and particular inverter in your application.
The maximum motor current determines the recommended wire sizes.
• The length column specifies that some inverters can optionally use a smaller wire gauge if
the wires are shorter than 10m and the inverter is located in an enclosure.
• Power Lines columns include wires connecting to terminals [R, S, T, U, V, W, P, PD, and N].
Only power input and motor leads will be fused: [R, S, T, U, V, and W]. The breaker ratings
(GFI—ground fault interrupter) are slightly higher than fuse ratings to allow for nominal
surges without tripping.
• The chassis ground columns list the Hitachi-recommended AWG and the minimal AWG for
UL conformity.
• The optional external braking resistor wiring only applies to a few models that have a built-
in braking unit. The other models use an optional external braking unit.
• Parallel wires increase effective wire gauge, and are denoted by “||” in the tables.
• Signal Lines, not listed in these tables, connect to the removable logic connector. The recom-
mended wire gauge for all wiring to the logic connector is 28 AWG (0.75 mm
2
). Be sure to
use shielded wire for any analog signals.
* See notes for wiring tables on the following page.
Motor
Output
200V
Inverter
Models
Wiring *1
Power Lines *3 Chassis Ground
Brake Res.
HP kW AW G
mm
2
Fuse
(UL-
rated,
class J,
600V)
Breaker
(GFI
type) *2
AW G ,
rec.
AW G ,
UL
mm
2
AW G
mm
2
1/2 0.4 SJ300–004LFU 20 1.25 10A 5A 16 14 1.25 20 1.25
1 0.75 SJ300–007LFU 18 1.25 10A 10A 16 14 1.25 18 1.25
2 1.5 SJ300–015LFU 14 2 10A 15A 16 14 1.25 14 2
3 2.2 SJ300–022LFU 14 2 15A 20A 16 14 1.25 14 2
5 3.7 SJ300–037LFU 10 3.5 20A 30A 10 12 3.5 10 3.5
7.5 5.5 SJ300–055LFU 8 5.5 30A 50A 8 10 5.5 8 5.5
10 7.5 SJ300–075LFU 6 8 40A 60A 8 10 8 8 5.5
15 11 SJ300–110LFU 4 14 60A 75A 4 10 14 8 5.5
20 15 SJ300–150LFU 2 22 80A 100A 3 8 22 — —
25 18.5 SJ300–185LFU 4 || 4 14 || 14 100A 100A 3 8 22 — —
30 22 SJ300–220LFU 4 || 4 14 || 14 125A 150A 2 8 30 — —
40 30 SJ300–300LFU 2 || 2 22 || 22 150A 200A 2 6 30 — —
50 37 SJ300–370LFU 2 || 2 30 || 30 175A 225A 1/0 6 38 — —
60 45 SJ300–450LFU 1 || 1
(75°C)
38 || 38 225A 225A 3/0 6 38 — —
75 55 SJ300–550LFU 2/0 || 2/0 60 || 60 250A 350A 3/0 4 60 — —