GE Industrial Solutions GERAPID 8007R, 10007R WITH ARC CHUTES 1X2, 1X3 - Manual (Page 32)

6.1.5 Inspection of contacts’ tilt and gap 6.1.6 Inspection of the screw connections
Pay attention to the warnings, Section 1! Pay attention to the warnings, Section 1!
A) Remove the arc chute and adapter • [Fig. 28]. Tighten front and rear arc probes’ screw
connections (3). Use torque of 10 Nm [88 in-lbs]. The arc
probe’s screw connections (3) must be secured by
means of lock washer.
• See 6.1.4-A/B.
B) Check the tilt of the main contacts
• Use the hand lever for slowly closing the main contacts. • [Fig. 28]. Tighten arc chute connections (4). Use torque of
5 Nm [44 in-lbs]. The arc chute’s screw connections (4)
must be secured by means of flat washer.
• Once the arcing contact touches arc probe, check the air
gap between main contacts. The gap between main
contacts shall have more than 1 mm [0.04 in].
• Any other screws shall be tightening with applied
torques listed in chapter 6.1, D.
• In case of insufficient tilt (gap), replace the arcing contact
with new one. See 6.2.1 and 6.2.2 for details.
• 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.
• If required gap is not available, even after component
replacing, please contact GE Service Team.
C) Check the air gap of arcing contact
• This check must be carried out prior to commissioning or
testing, and after maintenance.
• Close the breaker and secure the solenoid drive against
unintended opening.
Fig. 32 Securing closing drive against opening
Fig. 33 Inspection of the main contacts gap.
• [Fig. 33]. Check the air gap between the arcing contact
and main arm. It shall be minimum 1 mm [0.04 in].
• If required gap is not available, the arcing contact and/or
probes have to be replaced.
D) Install back adapter and arc chute
• See 6.1.4-G/H.
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.
6.1.8 Checking the blockade of the POCT
Pay attention to the warnings, Section 1!
A) Check the blockade
•
During inspection, note the position of the POCT’s
blockade (2). Normal position of the blockade, when no
current flow, is “unblocked”. [Fig 35]. The spring (1)
presses blockade (2) and forces “unblocked” state.
• After long periods of activation, the blockade may
become slightly polarized and may stay permanently in
the BLOCKED position [Fig 36].
• In this case, use a long thin wire or rod to check if
blockade can operate easily. Push blockade into block
state and release. Blockade must move back and unlock
the POCT.
• Use right access slot (4) to unblock the blockade with rod.
Very slowly start to push the blockade. After ~1…2 mm
blockade must switch back to unlock state only by
spring pressure.
3 1 2 4
Fig. 34 Back view on blockade and access slots
32 Design and specifications are subject to change without notice DTR01807 rev.02 2010-02-16