14
Instruction Book IB019009EN November 2017 www.eaton.com
AK-2-25, AK-2A-25, & AK-3A-25 LV-VSR
Breaker-To-Motor Starter Conversion
4.3 SECONDARY CONNECTION BLOCK
The LV-VSR control circuit is connected to the switchgear control
through a multi-contact block. The movable secondary control
contacts mounted on the LV-VSR are self-aligning, line-contact,
slip-type connectors. The multiple finger arrangement on the
LV-VSR makes contact with a stationary mounted element. The
contact surfaces on the stationary element are recessed to prevent
accidental short-circuiting of the control circuits. These secondary
disconnects mate in both the ‘Connect’ and ‘Test’ positions.
4.4 INTERLOCKS
There are several interlocks built into the LV-VSR. Each of these
interlocks, though different in form, duplicate or exceed in function
that of the original breaker. These interlocks exist to safeguard
personnel and equipment. The basic premise behind the interlocking
arrangement on the LV-VSR is that the LV-VSR must not be inserted
into or removed from the live circuit while the main contacts are
closed. Also considered in the interlocking is that the LV-VSR should
pose no greater risk than necessary to the operator in or out of the
cell.
(-)
FU
CONTR
OL POWER
23
(+)
G
AUXILIARY CONTACTS
CS BKR. CONTROL SWITCH - CLOSE
CS BKR. CONTROL SWITCH - TRIP
Y ANTI PUMP RELAY
X
PS1
-
-
T
-
-
C
-
VSR SECONDARY CONTACT PIN NUMBER
POSITION SWITCH- CLOSED IN "TEST" AND
"TEST" AND "CONNECT".
"CONNECT" POSITIONS. OPEN IN BETWEEN
LEGEND
FU
Ma
CS
C
CS
T
R
(-)
S
R
B
A
L63
COIL
AUX
CONT.
M
MR1
C
D
T
MR1
A1
A2
OL
PS1
Y
AOS-S (A)
Y
7
8
T
Y
(+)
Mb
T
7
8
Ma
a
MR1
a
MR1
a
MR1
a
MR1
b
MR1
b
MR1
b
33
51
61
71
72
62
52
34
24
n.o
n.o
n.c
n.c
6
4
4
6
C1
N.C
95
96
43
44
13
14
n.o
n.o
5
1
5
1
N.C
C
T TRIP/OPEN RELAY
-
Ma CONTACTOR NORMALLY OPEN CONTACT
-
Mb CONTACTOR NORMALLY CLOSED CONTACT
-
MR1/a CLOSE RELAY, NORMALLY OPEN CONTACT
FOLLOWS THE STATE OF CONTACTOR
MR1/b CLOSE RELAY, NORMALLY CLOSED CONTACT
FOLLOWS THE STATE OF CONTACTOR
MR1 CLOSE RELAY
-
M
-
V201 VACUUM CONTACTOR
S AND R ARE ENCAPSULATED COILS
CT
-
CURRENT TRANSFORMER 600/5
OL
-
CEP7-B SOLID STATE OVERLOAD RELAY
DB25-LV-VSR-425A IS MAGNETICALLY HELD CLOSED.
MR1 IS THE CLOSING RELAY. "T" IS THE TRIP/OPEN
RELAY.
ONCE A CLOSE SIGNAL IS SENT TO THE VSR, IT
REMAINS CLOSED UNTIL AN OPEN SIGNAL IS SENT.
V201
*
A
LINE
*
B
CT'S
*
C
LOAD
FU
FU
FU
FU
-
AJT600EI 600VAC CURRENT LIMITING FUSE
FUSES ARE THE SHORT-CIRCUIT PROTECTION
FOR THE V201 VACUUM CONTACTOR.
AOS-S (B)
N.C
C
AOS-S (C)
N.C
C
1
2
5
6
3
4
*
*
*
3
4
OPEN
-
OPEN PUSH BUTTON- LOCATED ON
DB25-LV-VSR. PRESS TO OPEN/STOP THE
OPEN
1
2
PB
OPEN
PB
PB
LV-VSR.
OL
97
98
SD5 AND SD6 IS AN OL ALARM CONTACT EQUIVALENT
IT ONLY CHANGES STATE ON AN OVERLOAD.
WARNING
INTERLOCKS ARE PROTECTIVE DEVICES FOR PERSONNEL AND
EQUIPMENT. DO NOT BYPASS, MODIFY, OR MAKE INOPERATIVE ANY
INTERLOCKS. DOING SO COULD CAUSE DEATH, SERIOUS PERSONAL
INJURY, AND/OR PROPERTY DAMAGE.
Figure 4.1. Typical Wiring Schematic
