Secheron UR46-81S, Instruction Manual

Page: 36 / 68

Maintenance UR46-81/82S
Document number: SG104148TEN Revision: B01 Issue date: 20.8.2012
Copyright© 2012 Sécheron SA - This document is not contractual and contains information corresponding to the level of technology at the date of release.
D-36
File: d-UR46-8S_maint_en.fm
D.6.5 Check and adjustment of the Z clearance
Requirement: Z = 1.6
± 0.2
mm
This measurement is performed with the circuit-breaker opened. A correct Z clearance setting is
important to correctly operate the auxiliary contacts (2), which signal the circuit-breaker status
(opened or closed). The auxiliary contacts may not operate when there is an incorrect
Z clearance.
Measurement
a) The SG101777P00001 spacer (1) must be inserted between the mobile (3) and the fixed (4)
contacts to block them in the completely opened position.
Note! If the optional “Position Indicator” is mounted on the housing (9), see § G.9 .
b) Remove the transparent cover (5).
c) Measure the Z clearance at the tip of the pusher (8) using the recommended Sécheron’s “Z”
gauge (or an universal feeler gauge).
Adjustment
Loosen the lock nut (7) and nut (6), turn the nut (6) to adjust the Z clearance and retighten both.
After the adjustment, at least two open/closing operations must be performed before rechecking
the clearance.
04640
D.6.6 Check and grease
a) In order to check the tightening torque of all screws and nuts, look at the red mark (4) which
must be aligned; if this mark is desaligned (5) retighten the screw according to the § D.2 table
or specifically specified torques in corresponding paragraphs throughout this manual (i.e the
nuts (1) at 17 Nm).
b) Grease the fork assembly (2) and the ratchet catch (3), applying the grease with a brush.
03626-S
1
5
9
4
3
5
2
Z
6 7
8
8 4
3
2
1
5
4