Poznámky redaktora
2 tra ific tio s
To adjust neutral (InN) comply with the following formula: I1x InN<Iu.
Failure com ply ith the setting lim its for MI1" and "InN" can dam age the circuit-breaker,w ith consequentrisks the operator
too. With the circuit-breaker open and possibly disconnected, install the protection unit the circuit-breaker.7. Circuit-breaker and release can now put into service.5.
5. *
Note:
* Offfor 3-pole versions
* 50% for 4-pole versions
* 100% for full-size versions
12 tin stru ctio tio service
12.6. 12. Actual maximum allowable adjustm ent must take into account any
tem perature derating, term inals used and altitude, (rating plug)< 50% circuit breaker size.
With 3-pole CB, with external neutral, the relay performs checks and setting done user.
In the SACE PR121/P release, this protection can set for the following values: InN Off 50% 100% 200% In.6.
3.1), press and hold the Test" button for few seconds until
all the red LEDs start flash confirm that installation complete.
With 4-pole CB, this setting checked the relay which signals any failure means LED (see par.
39/158
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2.
4.
6.
E.
12.
7.
A
W ith circu it-b rs, ith external neutral the stm neutral ust set to
O . 12. No.
Model 2234 Apparatus Scale
L 2778
Doc.1 s
3 -
4 Off 0.12.1 tra t
The neutral protection normally set current value 50% the adjustment made the phases.6.4PR121/P default settings
The PR121/P supplied ABB SACE with the following preset parameters:
# Protection Tim e
1 144 s
2 Off 0.
12.1) andindependently adjusts
this parameter, restoring within the accepted limits. Power the relay from any supply (Vaux, PR030/B, PR010/T).
In some installations, where particularly high harmonics occur, the current circulating the neutral may higher than that the phases.: With E1B800 having 400A Rating Plug, 800A and 11n, InN adjustment may 50-100-200%.g.1 s
5 ains frequency Hz
6 Neutral sel.7. Power the unit with the PR030/B ONLY. 2
Page No.
Note I1=1lnsetting intended the maximum adjustm ent the protection against overloads. there are errors other than the configuration error (see par.3 Replacing electronic release
To complete the procedure for installing PR121/P take the following steps:
1. Remove the PR030/B.
With E1B800 having 800A Rating Plug, 800A and 11n, InN adjustment may 50-100%. Make sure there are configuration errors ("Alive" LED on)
