6 Mounting
Maschinenfabrik Reinhausen GmbH 2020 636385142/08 EN ETOS
®
ED
6.2 Mounting drive shafts and bevel gear
The process of mounting the drive shafts and bevel gear is described in the
installation and commissioning instructions for the on-load tap-changer / de-
energized tap-changer.
6.3 Centering on-load tap-changer and motor-drive unit
WARNING
Danger of death or severe injury!
Danger of death or severe injury due to motor-drive unit starting up by acci-
dent and due to electric voltage!
► Before starting any coupling work make sure that the motor protective
switch is tripped.
► Carry out any adjustment work in manual mode only.
► When manually operating the motor-drive unit only use the hand crank
provided for this purpose.
► Note that the hand crank safety switch causes a 2-pole disconnection of
the motor circuit but that the control circuit is not interrupted.
NOTICE
Damage to property!
The on-load tap-changer will be damaged by incorrectly centering the mo-
tor-drive unit.
► Do not perform more than 250 tap-change operations on the on-load tap-
changer. If more than 250 tap-change operations are performed, com-
pletely fill oil compartment with insulating oil and lubricate sliding surfaces
of contacts on selector and selector gear with insulating oil.
The following steps for centering the on-load tap-changer and motor-drive
unit do not apply to the DEETAP® DU or COMTAP® ARS devices. The
process for centering the motor-drive unit and DEETAP® DU or COMTAP®
ARS devices is described in the relevant operating instructions.
One on-load tap-change operation is represented by one rotation of the tap-
change indicator. This indicator is divided into 33 tap-change indicator sec-
tions, each of which corresponds to one hand crank revolution in the stan-
dard motor-drive unit design. The time of the switchover depends on the on-
load tap-changer / de-energized tap-changer type, but is always 2 tap-
change indicator sections upstream of the area marked in gray on the tap-
change indicator at the latest.
To center the on-load tap-changer and motor-drive unit, proceed as follows.
1. NOTICE! Move the on-load tap-changer / de-energized tap-changer and
the motor-drive unit into the adjustment position before commencing any
adjustment work. Ensure that the tap position indicators for the motor-
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