Determining Wire And Fuse Sizes - Hitachi SJ300 Series Instruction Manual

2–14
Step-by-Step Basic Installation
Determining Wire
and Fuse Sizes
Motor
Output
HP kW
1/2 0.4
1 0.75
2 1.5
3 2.2
5 3.7
7.5 5.5
10 7.5
15 11
20 15
25 18.5
30 22
40 30
50 37
60 45
75 55
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
use shielded wire for any analog signals.
200V
Inverter
Models
AWG
SJ300–004LFU 20
SJ300–007LFU 18
SJ300–015LFU 14
SJ300–022LFU 14
SJ300–037LFU 10
SJ300–055LFU 8
SJ300–075LFU 6
SJ300–110LFU 4
SJ300–150LFU 2
SJ300–185LFU 1
SJ300–220LFU 1/0
SJ300–300LFU 1/0 || 1/0
SJ300–370LFU 1/0 || 1/0
SJ300–450LFU 1/0 || 1/0
SJ300–550LFU 2/0 || 2/0
* See notes for wiring tables on the following page.
Wiring *1
Power Lines *3
Fuse
(UL- Breaker
2
rated, (GFI
mm
class J, type) *2
600V)
1.25 10A 10A
1.25 10A 10A
2 10A 10A
2 15A 15A
3.5 20A 20A
5.5 30A 30A
8 40A 40A
14 60A 60A
22 80A 80A
14 || 14 100A 100A
14 || 14 125A 125A
22 || 22 150A 150A
30 || 30 175A 175A
38 || 38 225A 225A
60 || 60 250A 250A
2
). Be sure to
Brake Res.
Chassis Ground
AWG, AWG,
2
AWG
mm
rec. UL
16 14 1.25 20
16 14 1.25 18
16 14 1.25 14
16 14 1.25 14
10 12 3.5 10
8 10 5.5 8
8 10 8 8
4 10 14 8
3 8 22 —
3 8 22 —
2 8 30 —
2 6 30 —
1/0 6 38 —
3/0 6 38 —
3/0 4 60 —
2
mm
1.25
1.25
2
2
3.5
5.5
5.5
5.5
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