Overhauling; Checking Tightness Of The Screws; Interruption Devices In General; Tripping Device: Actuator And Transmission System - ABB VD4 Installation And Service Instructions Manual

9.3. Overhauling

9.3.1. Interruption devices in general

Should it have been necessary to clean the devices during the in-
spections, according to what is specified in par. 9.2.1., use the follow-
ing procedure:
• insulate the work area and make it safe, following the safety regula-
tions specified in the IEC/DIN VDE Standards;
• general cleaning of the surfaces:
– dry and eliminate light deposits of dirt with a soft dry cloth;
– more resistant deposits of dirt can be removed using slightly
alkaline domestic type detergent or Rivolta BWR 210 type deter-
gent;
• cleaning insulating surfaces and conductive parts:
– light dirt: with Rivolta BWR 210 detergent;
– resistant dirt: with cold detergent type 716.
After cleaning, rinse thoroughly with clean water and dry carefully.

Checking tightness of the screws

25 Nm
12 Nm
25 Nm
Fig. 12
46
Note
Only use detergents without halogens and never 1.1.1-trichloroethane,
trichloroethylene or carbon tetrachloride!

9.3.2. Tripping device: actuator and transmission system

Circuit-breakers up to 31.5 kA and up to 2500 A
To ensure correct operation of the circuit-breaker, inspection and
maintenance of the tripping devices is recommended every 10,000
operations. For this purpose, please contact the ABB Service office.
Complete replacement of the actuator, shock absorber and of the
other transmission system parts (shaft, main levers, safety rings,
etc.) must be carried out after 30,000 operations.
Circuit-breakers up to 40 kA and up to 2500 A
To ensure correct operation of the circuit-breaker, inspection and
maintenance of the tripping devices is recommended every 10,000
10 Nm 10 Nm
15 Nm