Major tech MT930 Manual de instruções - Página 2
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Introduction
The phase rotation indicator is a handheld instrument designed to detect the
rotary field of three-phase systems.
Symbols
The following symbols appear on the phase Rotation Meter or in this manual.
Risk of electric shock
Risk of danger. Important
information see manual
Hazardous Voltage
Equipment protected by double
or reinforced insulation
Elements of the Phase Rotation Meter
1
2
PHASE ROTATION INDICATOR
3
5
Determine the Rotary Field Direction
To determine the rotary field direction:
1.
Connect the test probes to the end of the test leads.
2.
Connect the test probes to the three mains phases.
3.
Green ON indicator shows that the meter is ready for testing.
4.
Either the clockwise or counter-clockwise rotary indicator illuminates
showing the type of rotary field direction present.
5.
The rotary indicator lights even if the neutral conductor, N, is connected
instead of the test lead input jacks.
CAT III
4
Earth
AC or DC
Conforms to EU directives
Over voltage (installation) Cat III, pollution
Degree 2 per IEC1010-1 refers to the level
of impulse withstand voltage protection
provided. Equipment of Over voltage CAT
III is equipped in fixed installations (e.g.
electricity meter and primary over-current
protection equipment.
1. Test lead input jack
2. L1, L2, L3 Indicators
3. Counter-clockwise rotation LCD
indicator
4. Clockwise rotation LCD indicator
5. Brief instructions on instrument rear
Figure 1. Phase Rotation Indicator