Adjustments
Timing mechanism and operating sequence
Operating sequence and timing are governed by the
hydraulic system, which utilizes insulating oil as the
operating medium. Operating sequence and timing can
be changed with the mechanism disassembled, during
maintenance, or by untanking to gain access to the points
of adjustment.
Timing
Provision is made for selecting a retarded B characteristic,
a retarded C characteristic or an extra retarded D
characteristic. Timing characteristics are selected
by indexing the timing plate to the appropriate hole
(see Figure 21).
otee:
N
After making timing changes the mechanical
operation must be checked to verify that the recloser
is operating per specifications, and to assure that the
sequence and timing are correct.
Operation
selector plate
Orifice plate
Trip rod
assembly
Control valve
assembly
Figure 21 . Indexing of timing plate
Operating sequence
Type V4E and V4L reclosers are designed so that they may
be easily reconfigured for different operating sequences, or
number of operations to lockout.
1. To change operating sequence the trip piston is
repositioned to the desired number of fast trip
operations, refer to Figure 22.
otee:
N
There are two different trip pistons used in these
reclosers; the KA23L1 piston provides either one or
two fast operations (F-PRI two fast operations, F-ALT
one fast operation), the KA23L3 piston provides
either two or three fast operations (F-PRI three fast
operations, F-ALT two fast operations).
L3
L2
L4
F-ALT
F-PRI
5/16" KA23L1
3/4"
KA23L3
Trip rod guide
Trip adjuster
Adapter
Cotter pin
Rollpin
Trip piston
Figure 22 . Adjustments for sequence and number of
operations to lockout
A. Pull trip rod up until top of piston is exposed. Place
a small fiber wedge between trip piston and valve
stop plate, to hold trip piston extended.
B. Carefully drive rollpin through trip adjuster
assembly. The trip adjuster should be backed by a
solid metal object while the rollpin is being driven
(in or out).
C. Reposition trip piston assembly for required
operating sequence.
D. Secure trip piston with rollpin.
otee:
N
Retarded timing characteristic for all four operations
requires a special slide valve, which is equipped with
a timing orifice.
2. The number of operations to lockout is selected by
positioning trip rod to the appropriate hole in trip
adjuster; secure assembly with cotter pin. Two, three or
four operations to lockout can be selected.
Types V4L and V4E single-phase maintenance instructions
15
MAINTENANCE INSTRUCTIONS
MN280055EN May 2017
