B2342
Emax VF
19/66
Doc. No
Model
Apparatus
Scale
Page No
1SDH000909R0001
8. Maintenance
8.1. Warning
WARNING: Before carrying out any maintenance task, you must:
-
Open the circuit-breaker and check that the operating mechanism springs are unloaded;
-
In the case of a withdrawable circuit breaker, remove the circuit breaker from the fixed part before working on it;
-
For action on fixed version circuit-breakers or on fixed parts disconnect the power circuit and the auxiliary circuits
and visibly earth the terminals both on the power supply side and on the load side;
-
Make safe in compliance with current laws.
WARNING ELECTRICAL SHOCK HAZARD: Shock Hazard or Injury.
ABB declines all responsibility for damage to things and injury to people due to failure to comply with the instructions contained in
this document. Maintenance tasks must be performed by qualified staff with a detailed knowledge of the unit.
8.2. Maintenance programme
8.2.1. Circuit-breaker life
With regular maintenance, SACE Emax circuit-breakers, either with or without opening or closing releases, can withstand the following
operation without replacement of parts.
(1)
Rated uninterrupted current
Mechanical life
(2)
Electrical life (50Hz/60Hz)
(2) (3)
Iu (40 °C)
[A]
No. of operations
x 1000
Frequency
operations/hour
690 V ~
No. of operations x
1000
Frequency
operations/hour
E2N/VF
1200
12
30
10
30
1600
12
30
10
30
E3H/VF
2000
10
30
7
20
2500
10
30
7
20
LTT Low termperature version
E2 LTT
(4)
1200 - 1600
8
30
8
30
E3 LTT
(4)
2000 - 2500
8
30
7
30
(1) Data referring to standard installation conforming to product standards. For other applications, please consult ABB Sace.
(2) Extreme atmospheric conditions, polluted atmosphere or vibrations may shorten the application’s life. Please consult ABB Sace.
(3) For different frequency please consult ABB Sace.
(4) Switch disconnectors
8.2.2. Maintenance program
The table shows the maintenance intervals and the frequency of periodical intervention and routine maintenance tasks. The following
rules should also be followed:
- Even circuit-breakers that are little used or remain on or off for long periods should be subject to the maintenance programme.
- The SACE PR122/VF release enable the number of operations performed by the circuit breaker in use to be displayed at any mo-
ment on the display.
- During operation, inspect the circuit-breaker from the outside to check for dust, dirt or damage of any kind.
Maintenance operations
Interval
Installation in normal environments
Installation in dusty environments
( 1)/( 2)
and low temperature environment
(3)
[ (1) = level of measured dust > 1 mg/m³ ]
First level
One year or 20% mechanical life
or 20% electric life
6 months or 10% mechanical life
or 10% electric life
Second level
Three years or 50% mechanical life
or 50% electric life
or after intervention on short circuit
18 months or 25% mechanical life
or 25% electric life
or after intervention on short circuit
(1) Data referring to standard installation in accordance with product standards. For other applications, please consult ABB Sace.
(2) Extreme atmospheric conditions, polluted atmosphere or vibrations may shorten the life of the application. Please consult ABB Sace.
(3) Emax LTT Low temperature environment application.
8.3. First level maintenance operations
8.3.1. Preliminary operations:
-
open the circuit-breaker and check that the control springs are unloaded
-
in the case of a withdrawable circuit breaker, remove the circuit breaker from the fixed part before working on it
WARNING: before working on fixed circuit-breakers or on fixed part, disconnect the supply to the power circuit
and to the auxiliary circuits and earth the terminals in a visible manner both on the supply and on the load side.
8.3.2. Checks and general cleaning:
- Check that the apparatus (switching part) is clean, removing dust and any traces of excess oil or grease using dry and clean rags
(possibly using non-corrosive detergent.
