RPS LJ12 User manual
INSTRUCTION MANUAL
Relay Associates Type LJ - High Speed Auxiliary Relays
LJ12
LJ22
LJ32
Relay Associates brand is owned by Relay & Power Systems
APRIL 2017 | VERSION 1.3
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TABLE OF CONTENTS
GENERAL DESCRIPTION
LJ RELAY CONFIGURATION AND ORDERING INFORMATION
APPLICATION
SPECIFICATIONS AND RATINGS
CONTACT RATING FOR LJ RELAYS PER ANSI C37.90
RELAY COIL AND OPERATING SPECIFICATIONS
TARGET
ELECTRICAL SEAL-IN OPTION
RECEIVING
INSTALLATION
ADJUSTMENTS
TESTING PROCEDURES
ELECTRICAL OPERATION
MANUAL OPERATION
TEST SWITCHES
TYPICAL TERMINAL BLOCKS
STANDARD WIRING DIAGRAM
ELECTRIC SEAL IN WIRING SCHEMATIC
PANEL CUTOUT AND DRILLING FOR SEMI-FLUSH CASES
PROJECTION UNIT MOUNTING FOOTPRINTS
ABOUT US
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LIST OF TABLES
TABLE 1: MODEL IDENTIFICATION / ORDERING INFORMATION
TABLE 2: AVAILABLE LJ RELAY MODEL NUMBERS
TABLE 3: EXAMPLES 48V DC STANDARD MODELS
TABLE 4: EXAMPLES 125V DC STANDARD MODELS
TABLE 5: EXAMPLES 250V DC STANDARD MODELS
TABLE 6: CONTACT RATINGS
TABLE 7: RELAY SPECIFICATIONS
TABLE 8: CUTOUT DIMENSIONS (INCHES) FOR FLUSH CASES
LIST OF FIGURES
FIGURE 1: TERMINAL BLOCKS
FIGURE 2: STANDARD WIRING DIAGRAM (EXCLUDING LJ4X
SERIES)
FIGURE 3: ELECTRICAL SEAL IN WIRING SCHEMATIC
FIGURE 4: PANEL CUTOUT
FIGURE 5: PROJECTION MOUNT DRILLING DIMENSIONS
FIGURE 6: SCHEMATIC OF LJ41, LJ42, AND LJ43
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General Description
The LJ relay is a high speed, high inertia auxiliary relay
designed
to operate in 4 milliseconds*. The relay can be configured
with any combination of two (2), six (6) or ten (10) contacts
normally open or normally closed contacts. The dustproof, all
aluminum case is available in both flush and projection mount
configurations . The shielded coil minimizes internally generated
transients and provides immunity to misoperations from system
transients.
The different models can be identified by referring to the Table 1
* Refer to Table 6 and 7 for LJ relay specifications and ratings
LJ Relay Configuration & Ordering Information
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LJ Relay Configuration & Ordering Information
LJ Relay M odel Number LJ
Case Type
Flush Case, with Target, no Test Switches
1
Flush Case, with Target and Test Switches
2
Projection Mount Case, no Test Switches or Target
3
Projection Mount with no Case or Test Switches
4
Number of Contacts
Two Contact Units (see note 3)
Si Contact Units
Ten Contact Units
Standard Size
All e cluding LJ12 & LJ32
LJ12 & 32 only
Operating DC Voltage
250 Volt DC Operating Coil
125 Volt DC Operating Coil
48 Volt DC Operating Coil
Seal Option
Seal-In with Manual Reset Option (see note 4)
No Seal-In Option
Number of Normally Open/Close Contacts (see note 1&2)
Open Contacts
Closed Contacts
*NOT ALL CONFIGURATIONS ARE AVAILABLE CHECK TABLE 2.
FOR
AVAILABLE MODELS
Note 1. Sel ecti ng the seal-i n unit r ed uces usa ble c ontac ts by one not available on projec ti on mount
uni t s
Note 2. Summa ti on of N/ O and N/C contacts cannot exceed 2 f or LJ X 1 model s, 6 for LJ X2
model s, a nd 10 for LJ X3 mod el s.
Note 3. 2 Contacts units only available on LJ4X model s.
Note 4. R eset Opti on only available on Flush Case mod el s (LJ1 and LJ2)
TABLE 1. MODEL IDENTIFICATION / ORDERING INFORMATION
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-
E
S
A
B
C
L
N
X
X
1
2
3
LJ
X
X
X
X
X
- [XX]
1
2
S
A
N - [42], [60], [33]
1
2
S
B
N
- [33], [42], [51], [60]
1
2
S
C
N
- [33], [51]
1
3
E
A
N - [100], [82]
1
3
E
B
L - [100], [64]
1
3
E
B
N
- [100], [46] ,[55], [64], [73], [82], [91]
1
3
E
C
N
- [100], [55], [64]
2
2
E
A
N - [42], [51], [60]
2
2
E
B
N
- [33], [42], [51], [60]
2
3
E
A
N - [100], [64], [73], [82]
2
3
E
B
L - [100], [46], [64]
2
3
E
B
N
- [010], [100], [55], [64], [73], [82], [91]
2
3
E
C
N
- [55], [73]
3
2
S
B
N
- [33], [51], [42], [60]
3
2
S
C
N
- [60], [33], [42]
3
3
E
B
N
- [100], [55], [64], [73], [82], [91]
4
2
E
B
N
- [33], [42], [24], [06], [60]
4
3
E
B
N
- [100], [73], [55], [64]
4
3
E
C
N
- [100], [73], [82]
TABLE 2. AVAILABLE LJ RELAY MODEL NUMBERS
LJ
1
3
E
C
N
-
5
5
1 - Flus h Case, ith Target, No Test S itches
3 - Ten Contacts
E - Sta ndard Size
C - 48 Volt DC Operating Coil
N - No Seal-In Option
5 - Five Normally Open Conta cts
5 - Five Normally Closed Co ntacts
LJ
3
2
S
C
N
-
3
3
3 - Projection Mount Cas e, No Test S itches or Target
2 - Six Contacts
S - Standard Size (LJ12 & LJ32 only)
C - 48 Volt DC Operating Coil
N - No Seal-In
3 - Three Normally Open Co ntacts
3 - Three Normally Closed Co nta cts
TABLE 3. EXAMPLES 48V DC STANDARD MODELS
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LJ
4
3 E
B
N
-
6
4
4 - Projection Mount ith No Case o r Test S itches
3 - Ten Co nta cts
E - Sta ndard Size
B - 125 Volt DC Operating Coil
N - No Seal-In
6 - Six Normally Open Co ntacts
4 - Fo ur Normall y Closed Contacts
LJ
2
3 E
B
L
-
10
0
2 - Fl ush Case, ith Target a nd Test S itches
3 - Ten Co nta cts
E - Sta ndard Size
B - 125 Volt DC Operating Coil
L - Seal-In ith Ma nual R eset
10 - Ten Norma ll y Open Co nt acts
0 - Zero Normally Closed Co ntacts
TABLE 4. EXAMPLES 125V DC STANDARD MODELS
LJ
1
2
S
A N
-
4
2
1 - Flush Case, ith Target, no Test S itches
2 - Six Co nta cts
S - Standard Size (LJ12 & LJ32 only)
A - 250 Volt DC O perating Coil
N - No Seal-In
4 - Four Normally Open Conta cts
2 - T o Normally Closed Co nt acts
LJ
2
3 E A N
-
8 2
2 - Flush Case, ith Target a nd Test S itches
3 - Ten Co ntacts
E - Standa rd Size
A - 250 Volt DC O perating Coil
N - No Seal-In
8 - Eig ht Normall y Open Co ntacts
2 - T o Normally Clos ed Contacts
TABLE 5. EXAMPLES 250V DC STANDARD MODELS
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Application
LJ auxiliary relays are mainly applied in protective relay
high speed tripping schemes in electric utility and industrial
substations .
general purpose applic ations.
Specifications
In tests conducted by an independent lab, the LJ relay was found
to meet or exceed the F ast Transients and Surge W ithstand
requirements as defined by ANSI C37.90. The capacitive energy
required to induce a momentary contact closure is greater than
0.60 Joules.
Tables 6 and 7 below are in compliance with ANSI C37.90
rating specifications.
Rating for LJ Relays Per ANSI C37.90
Current Interrupting
Make & Carry Current
Rating
Ratings
Inductive
Short Time
(L/R=0.1)
(1 sec)
0.55 amps
30 amps
0.28 amps
30 amps
2.88 amps
60 amps
1.44 amps
60 amps
TABLE 6
.
CONTACT RATINGS
LJ
r
e
l
a
y
s
ar
e
a
l
s
o
s
u
i
tab
l
e
f
o
r
c
o
n
t
r
o
l
,
s
w
i
tc
h
i
n
g
a
n
d
and Ratings
Con
t
act
Contact
Circuit
125 VDC
250 VDC
125 VAC
250 VAC
Co
n
t
i
n
u
o
u
s
5 amps
5 amps
10 amps
10 amps
Pa
g
e
8
o
f
21
R
e
sis
t
i
v
e
1.1 amps
0.55 amps
5.76 amps
2.88 amps
Type LJ - High Speed Auxiliary Relays
Operating Data for Continuously Rated
LJ Relay Per ANSI C37.90
Coil Operating Holding
Circuit Coil Coil
Voltage Resistance Resistance
(DC)
(Ohm)
(Ohm)
125
13
1490
(2&6
contacts)
125
13
1490
(10
contacts)
250
52
8600
(2&6
contacts)
250
52
8600
(10 (+/- 0.5)
contacts)
1.9
1724
4.5
(+/- 0.5)
1.9
1724
5.0
(10 (+/- 0.5)
contacts)
TABLE 7
. RELAY COIL AND OPERATING SPECIFICATIONS
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RPS INS
T
RUCTION
MAN
U
AL
T
y
pical Op
e
r
a
te
O
pe
r
a
t
i
n
g
Time (ms) N.O. Voltage (DC)
Contact
D
r
o
p
o
u
t
M
u
s
t
M
u
st
(Typical)
Pickup
Dropout
17
100
17
17
100
17
17
200
17
17
200
17
17
38
17
17
38
17
P
i
c
ku
p
4.5
(+/- 0.
5)
5.0
(+/- 0.5)
4.5
(+/- 0.5)
5.0
48
(2&6
contacts
)
48
Target
Operation
A direct driven, manually resettable target is standard on flush
mount units. When the relay operates, a bright orange target and
a small black reset tab are exposed
.
Reset
After de-energizing the relay, pushing up the black tab will reset
the target. Target reset can only be accomplished manually
.
Electrical Seal-In Option
An LJ relay with this option will pick up and seal-in continuously
using a rated voltage source until reset by one of the methods
below
. The recommended wiring for this option is shown in Figure
3
. Due to internal space requirements, an LJ12 which is ordered
with this option will be supplied in a LJ13 case. (note: reduces
number of usable contacts by one)
Local Reset
When reset is desired, depress the small push-button located on
the front panel of the relay. This will interrupt the seal-in circuit
allowing the relay to reset
.
Remote Reset
Remote reset of the coil can also be accomplished by connecting
a SCADA controlled normally closed contact, in series with the
electrical seal-in circuit (see Figure 3).
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RPS INSTRUCTION MANUAL
Type LJ - High Speed Auxiliary Relays
Receiving
Upon receipt of the relay, inspect the relay to verify that its model
number agrees with the requisition. Also check for damage which
may have been sustained in transit. If damage is evident, file a
claim with the transportation company and notify your supplier or
Relay & Power Systems directly at 610-941-2900. If the unit is to
be stored, Relay & Power Systems recommend keeping the relay
in its original packaging to protect the unit
.
W hen handling the
relay, exercise reasonable care as to avoid severe impacts
.
Installation
The relay is shipped from the factory pre-configured to
the customer’s specifications and should not require an y
modifications on site. Mount the relays vertically on switchboard
instrument and control panels for proper target operation. Refer
to Figures 4 & 5 for LJ panel cutout and drilling dimensions,
respectively
. Panel fasteners are included in the shipping
carton . Recommended terminal block and wiring connections for
different LJ models are shown in figures 1, 2, 3 and 6).
Adjustments
LJ relays have been designed with no maintenance or
adjustments required to maintain reliable operability within
specified ratings
.
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Testing Procedures
Electrical Operation
The relay can be tested by applying a rated DC voltage source
to the coil circuit. W hen the voltage source is applied, a
low resistance “operate” coil is energized to enable the high
speed operation. W hen the relay picks up, a high resistance
“holding” coil is switched into the circuit and allows the LJ to
be continuously energized with minimal current until the power
source has been removed.
Manual Operation
For testing purposes, the relay can also be operated manually by
inserting a small probe (e.g. #2 Phillip head screwdriver) through
the center hole of the nameplate. Pushing in on this probe will move
the armature, and thereby operate the contacts and target assembly
(note: Not applic abl e on LJ32 or LJ33).
Test Switches
As an option, test switches are provided on both sides of each
contact and the operating coil (refer to Figure 2). The test
switches are used to isolate each individual contact or the
operate coil for testing purposes. Small banana plug electrical
connectors (3/64” dia.) can be used to electrically connect to the
relay circuit at the test switches. In order to assure connection
to the proper circuit, please refer to Figure 2. Opening the
appropriate test switches will allow the user to operate the relay
while isolating it from the external circuits.
Important: When completed, be sure to close all test switches
and secure the test switch cover plate
.
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Standard Wiring Diagram
FIGURE 5. STANDARD WIRING DIAGRAM (EXCLUDING LJ4X SERIES)
Pa
g
e
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Electric Seal in Wiring Schematic
FIGURE 6
. ELECTRICAL SEAL IN WIRING DIAGRAM
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Panel Cutout And Drilling For Semi-Flush Cases
G
F
E
.
125” rad.
TABLE 8
.
CUTOUT DIMENSIONS (INCHES) FOR FLUSH CASES:
G
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A
G
D
G
C
B
F
I
G
U
R
E
7
.
P
A
N
EL CU
T
OUT
.
221
”
dia.(4
pl
a
c
e
s)
(4
plac
e
s)
Projection Unit Mounting Footprints
FIGURE 8
. PROJECTION MOUNT DRILLING DIMENSIONS
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Left to Right : the 2 contact LJ41, the 6 contact LJ42 and the 10 contact LJ43
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FIGURE 9
. LJ41, LJ42, AND LJ43 DRAWING
Notes:
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