1 Main Breaker[edit | edit source]
1.1 Adjustment Type 1[edit | edit source]
| Switch | Description | Adjustment |
|---|---|---|
| IR | Setting for overload protection. Factor load current to breaker nominal current IR = Factor * In |
Set factor according to cabinet name plate data. Usually the nominal current of the breaker should be equal to cabinet name plate (so the factor is "1").
An exception is +SW23 with nominal breaker 250A, and name plate = 200A. So in this case, factor must be 0.8 |
| Isd | Isd = short curcuit current | Fix to Factor 6 |
| tsd | Fixed delay time | Fix to 0.2 and I2t on |
1.2 Adjustment Type 2[edit | edit source]
In the case that Ii on circuit breaker indicates as Factor *IN;
| Switch | Description | Adjustment |
|---|---|---|
| Ii | Overload current for immediate switch off Ii = x * In! |
Fix to Factor 4 (If 5 is the minimum, set to 5). |
| IR | Setting for overload protection. | Set IR = IN |
In the case that Ii on circuit breaker indicates as A (ampere) as in picture below;
| Switch | Description | Adjustment |
|---|---|---|
| Ii | Overload current for immediate switch off Ii = 4 or 5 * In! |
For the example in picture above, 4 * 400 = 1600A, but the minimum adjustable is 5 * 400 = 2000A. So we adjust it at 2000A |
| IR | Setting for overload protection. | Set IR = IN |
1.3 Adjustment Type 3 (ETU320)[edit | edit source]
| Switch | Description | Adjustment |
|---|---|---|
| Ir | Setting for overload protection. | Set according to cabinet name plate data. Ir=IN (Full load current) |
| tr | Delay time for overload protection. | Set to 3 sec. |
| Ii | Overload current for immediate switch off. | Ii = 4 * Ir |
2 Motor Breaker[edit | edit source]
Adjust to the nominal current of the motor and label the breaker
3 Breakers with Frequency Converters[edit | edit source]
Circuitbreakers supplying frequency converters (mainly micromasters) must be set to the value given in the electrical drawing.
If a frequency converter drives more than one motor (like TDO cooling zone fans, Pull Roll Nip Rolls etc.) adjust the motor breakers 20% higher than the nominal motor current.
