Features Of Operation; Long Delay Protection (L); Short Delay Protection (S) - WEG ABW Serie Manual De Instrucciones

4.5 FEATURES OF OPERATION

4.5.1 Long delay protection (L)

Protection against overload, with feature of current inverse time.
1. Current Ir
a) Adjustment of range in N and A type units:
(0.4~1.0) xIn
- Iu: (0.5-0.6-0.7-0.8-0.9-1.0) xIn
- Ir: (0.8-0.83-0.85-0.88-0.9-0.93-0.95-0.98-1.0) xIu
b) Adjustment of range in the P and S type units:
(0.4~1.0) xIn
- Ir: (0.4-0.5-0.6-0.7-0.8-0.9-1.0) xIn
2. Performance time tr
- The performance time is based on current of 6xIr
- Adjustment of range: (0.5-1-2-4-8-12- 16-20-Off)s
3. Start of timing
- It occurs when the current exceeds 1.15xIr
4. The unit performs as per the greatest current between the phases R, S, T and the neutral N.

4.5.2 Short delay protection (S)

Protection against short-circuit (timed performance), with feature of inverse time or defined time.
1. Current Isd
- Adjustment of range: (1.5-2-3-4-5-6-8-10-Off) xIr
2. Performance time tr
- The performance time is based on the current of 10xIr
- Adjustment of range for inverse time:
(0.1-0.2-0.3-0.4)s
- Adjustment of range for defined time:
(0.05-0.1-0.2-0.3-0.4)s
3. The unit performs as per the greatest current between the phases R, S, T and the neutral N.
4. The unit can also operate instantaneously by means of the function ZSI.
Figure 4.3: Long delay protection (L).
Figure 4.4: Short delay protection (S).
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