Specifications

Earth-leakage Detectors
Mechanical Indicators
91
LM-11NGD
 An earth-leakage detector detects an earth fault of an ungrounded 3-phase 3-wire circuit and enables
the degree of the earth fault and the ground phase to be judged by deflection of a needle.
With the instrument voltage transformer, a connection is formed at the primary side to directly ground the
neutral point and a  connection with one corner open is formed at the secondary side (or tertiary side).
Specifications
Size (width ✕ height) mm
Model name
Operation principle
Zero-phase voltage
Indicator rated voltage
Frequency
Consumption VA
Weight (kg)
Accessory
Delivery period classification
Wide-angle indicator
110✕110
LM-11NGD
Rectifier
50 or 60Hz
0.6
T-150 rectifier

Vaf=110V Vaf=190V
63.5V 86.6V 110V 150V
1VA 2VA
Standard
product
Immediate delivery
 Quasi-standard
product
Within 20 days
Special
product
21 to 60 days
Symbol
Reference delivery period
Delivery period classification
Remarks
(1) Please specify the VT ratio of the EVT used in accordance with the following examples.
/ / V (specification example in the case where Vaf=110V)
/ / V (specification example in the case where Vaf=190V)
110
3
V
190
3
V
Vaf=190V
Vaf=190V
Vaf=110V
Vaf=110V
Primary Secondary Tertiary
Zero-phase
tertiary voltage
Zero-phase
tertiary voltage
(The secondary winding may be omitted.)
Example of EVT with tertiary winding
Remarks
(2) An alarm contact that is activated by the voltage relay when the zero-phase voltage (Vaf) is
50 to 75V (Vaf=190V) is standard equipment. Contact capacity: 100VAC, 1A (resistive load).
(3) In the case of using a VT that is not specially designed as a zero-phase transformer, a
harmonics suppressing resistor (dummy load) is connected between open and delta.
The resistor is selected according to the load of the voltage transformer and should
comply with the following:
200W 200Ω (200Ω±10%) when Vaf=190V
150W 120Ω (120Ω±10%) when Vaf=110V
(4) Be careful of the following matters in using this indicator for telemetry.
q Please specify the resistance value if the lead wire resistance between the rectifier
and the meter exceeds 15Ω (one-way).
w There are three communicating lines between the rectifier and the meter (not including
the alarm circuit), and the differences among the resistance values of these lines must
be 15Ω or less.
(5) Please specify the frequency.
(6) Please make sure to read the “Safety Precautions” (pp.5-8) and the “Selection Precautions” (p.9) to assist in selecting the model and use specifications suited to the application.
LM-11NGD 150V 0-9000V / / V B 60HzVAF190V
190
3
6600
3
110
3
2
Model name Indicator rating
Scale Cover type Zero-phase voltageVT ratio Frequency
The items in must be specified.
Number of
units
110
110
f100
10.3
17.3
15
94
4-M5 mounting screws
M5 terminal screw
f104
4—f6
45 45
45 45
Panel hole opening dimensions (mm)
Outer dimensions
INPUT
Nameplate
130
115
100
70
R3
R3
100
6
6
M4 terminal screw
12 12
6 6
12 12
1.2
89
113
16
150
11.5
12.5
12.5
11.5
100
a
d
b
e
cf
1
23
OUTPUT
ALARM
A1
A2
Alarm relay operation voltage
changeover switch
T-150 rectifier (for earth-leakage detector)
Outer dimensions of accessories
123
S
R
T
a
a
b
b
c
c
f
f
d
e
1
1
2
2
3
3
A1
A2
T-150 rectifier
Auxiliary power supply
LM-11NGD
Connection diagrams
⎧
⎨
⎩
⎫
⎬
⎭
6600
3
110
3
110
3
6600
3
110
3
190
3
Ordering method