GE Industrial Solutions GERAPID 2508, 4008, 5008, 6008 WITH ARC CHUTE 1X2 - Manual (Page 46)

46 Design and specifications are subject to change without notice S47183De rev.02 2011-03-14
6.1.5 Inspection of contacts’ tilt and gap
Pay attention to the warnings, Section 1!
A) Remove the arc chute and adapter
 See 6.1.4-A/B.
B) Check the tilt of the main contacts
 [Fig. 40]. Use the hand lever for slowly closing the main
contacts.
 [Fig. 46]. Once the arcing contact touches arc runner, check
the air gap between main contacts. The gap between main
contacts shall have more than 1 mm [0.04 in].
 In case of insufficient tilt (gap), replace the arcing contact
with new one. See 6.2.1 and 6.2.2 for details.
 If required gap is not available, even after component
replacing, please contact GE Service Team.
C) Check the air gap of arcing contact
 Close the breaker and secure the solenoid drive against
unintended opening. See 1.2.1.
 [Fig. 47]. Check the air gap between the arcing contact and
main arm. It shall be minimum 1 mm [0.04 in].
 In case of insufficient gap, replace the arcing contact with
new one. See 6.2.1 and 6.2.2 for details.
 If required gap is not available, even after contact
replacing, please contact GE Service Team.
D) Reinstall back adapter and arc chute
 See 6.1.4-G/H.
6.1.6 Inspection of the screw connections
Pay attention to the warnings, Section 1!
 [Fig. 45]. Tighten front and backside of the arc runner screw
connections (2) and (5). Use torque of 10 Nm [88 in-lbs].
 [Fig. 45]. Tighten arc chute connections (3). Use torque of
5 Nm [44 in-lbs].
 [Fig. 45]. The arc runner’s screw connections (2) must be
secured by means of lock washer.
 [Fig. 45]. The arc chute’s screw connections (3) must be
secured by means of flat washer.
 Any other screws shall be tightening with applied torques
from Table 6.1.
 Ensure that the screws are in good condition, that thread
and nest are not damaged. Surface shall be free from rust.
Replaced any screw, which does not fulfill above conditions.
 This check must be carried out prior to commissioning and
after maintenance.
6.1.7 Inspection of the mechanical components
Only GE Service Team or its representative shall perform this
inspection. These require major disassembly and adjustment
of the breaker. Customer, without supervision of trained
specialist, shall not execute these.
Fig. 45 Inspecting screw connections
Fig. 46 Inspection of the main contacts’ tilt
Fig. 47 Inspection of the arcing contact’s air gap
3
5
3
2