12. OPTIONS AND AUXILIARY EQUIPMENT
12.2.7 Leakage current breaker
(1)Selection method
Select a leakage current breaker according to the following formula, and ground the servo amplifier, servo motor, etc. securely.
Make the input and output cables as short as possible, and also make the grounding cable as long as possible (about 30cm (11.8 in)) to minimize leakage currents.
Rated sensitivity current |
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| 10 {Ig1 | Ign Iga K | (Ig2 | Igm)} [mA] ..........(12.2) |
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| K: Constant considering the harmonic contents | ||||
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| Leakage current breaker |
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| NV |
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| Noise |
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| Type | Mitsubishi | K | ||||||||||
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| products |
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| filter |
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| Cable |
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| Servo |
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| SM |
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| Models provided with |
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| amplifier |
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| 1 | |||||||||||||||||
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| harmonic and surge | ||||||||||
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| reduction techniques |
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| Ig1 Ign |
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| Iga |
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| Ig2 |
| Igm |
| General models | 3 | ||||||||||||||||||||||||||||
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Ig1: | Leakage current on the electric channel from the leakage current breaker to the input terminals | |||||||||||||||||||||||||||||||||||||||||||||||
| of the servo amplifier (Found from Fig. 12.1.) |
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Ig2: | Leakage current on the electric channel from the output terminals of the servo amplifier to the | |||||||||||||||||||||||||||||||||||||||||||||||
| servo motor (Found from Fig. 12.1.) |
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Ign: | Leakage current when a filter is connected to the input side (4.4mA per one |
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Iga: | Leakage current of the servo amplifier (Found from Table 12.6.) |
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Igm: | Leakage current of the servo motor (Found from Table 12.5.) |
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| 120 |
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current | 100 |
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80 |
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Leakage |
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60 |
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| 40 |
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[mA] 20 |
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| 0 |
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| 3.5 | 8 1422 38 80 150 | |||||||||||||||
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| 5.5 | 30 60 100 |
Cable size[mm2]
Fig. 12.1 Leakage current example (Ig1, Ig2) for CV cable run in metal conduit
Table 12.5 Servo motor's
| leakage current | |
| example (Igm) | |
Servo motor |
| Leakage |
output [kW] |
| current [mA] |
0.05 to 0.5 |
| 0.1 |
0.6 to 1.0 |
| 0.1 |
1.2 to 2.2 |
| 0.2 |
3 to 3.5 |
| 0.3 |
5 |
| 0.5 |
7 |
| 0.7 |
Table 12.6 Servo amplifier's leakage current example (Iga)
Servo amplifier | Leakage current |
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capacity [kW] |
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0.1 to 0.6 |
| 0.1 |
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0.7 to 3.5 |
| 0.15 |
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5 to 7 |
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Table 12.7 Leakage circuit breaker selection example | ||||||
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| Rated sensitivity | ||
Servo amplifier |
| current of leakage | ||||
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| 50 | |||||
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12 - 33