Specifications

Synchroscopes
Mechanical Indicators
93
Specifications
L1-11NSY
A synchroscope indicates the synchronization point (scale center) when the frequencies and the
phases at a generator side and a bus line side are matched.
If the frequencies of both sides are equal, the position at which the needle is stationary indicates the
phase difference between the two.
When the generator side (starting side) frequency is fG and the bus line side (operating side)
frequency is fB, the direction of rotation of the needle is as follows:
When fG=fB The needle is stopped.
When fG>fB The needle rotates in the FAST direction.
When fG<fB The needle rotates in the SLOW direction.
Size (width ✕ height) mm
Model name
Operation principle
Accuracy (grade)
Frequency
Weight (kg)
Indicator type
Rated voltage V
Wide-angle indicators
110✕110
LI-11NSY
Movable iron core (induction)
5
50Hz or 60Hz
2.0
With phase angle scale (delivery period: )
1-phase
110
4
4
220
8
8
110
4
4
220
8
8
Accessory
Delivery period classification
Special specification
Consumption VA
Generator side
Bus line side
3-phase
T-150 shunt T-150 resistor

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) The pull-in and dropout frequencies are 2 to 3Hz. That is, although the needle rotates up to a frequency
difference of 2 to 3Hz according to the difference and indicates whether the generator (or starting side) is slow or
fast, when the difference becomes large, the needle moves slightly without rotating.
(2) The needle does not rotate when the frequency difference is large. In this case, judgments should be made
using the light shown in the connection diagram. Please note that the light is not supplied; it is to be prepared by
the customer if required.
(3) The specifications are continuous rating specifications.
(4) In a state where electricity is not supplied, the needle indicates an arbitrary position exceeding ±30° from the synchronization point.
(5) The lead wire length from the main synchroscope unit to an accessory device must be set to 5m or less.
(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.
(7) The scale must be specified. The standard specification is: SLOW-FAST.
f100
10.3
17.3
190
4-M5 mounting screws
M5 terminal screw
f104
4-f6
4545
4545
Panel hole opening dimensions (mm)
15
Resistance box
110
110
Fig. 1 LI-11NSY
Outer dimensions
Phase angle scale
An indicator with phase angle scale, in which an angle scale centered at the synchronization point (scale
center) is drawn, can also be manufactured.
The needle indicates the phase difference between the generator side and bus line side. The indicator
can thus be used for measuring the phase difference when the needle is stationary or for timing of
startup.
The standard phase angle scale is a 30° forward/backward scale.
L1-11NSY with phase angle scale