Major tech MT935 User manual

MT935
PHASE ROTATION METER
WITH ROTARY FIELD DIRECTION
INSTRUCTION MANUAL

Introduction
The Motor and Phase Rotation meter is a handheld, battery-operated
instrument designed to detect the rotary field of three-phase systems and
determine motor rotation direction.
Symbols
The following symbols appear on the Motor & Phase Rotation Meter or in this
manual.
Elements of the Motor & Phase Rotation Meter
Using the Motor & Phase Rotation Meter
Determine the Rotary Field Direction
To determine the rotary field direction:
1. Connect one end of the test leads to the motor & phase rotation
indicator. Make sure the L1, L2, and L3 test leads are connected to the
corresponding input jacks.
2. Connect the test probes to the other end of the test leads.
Earth
AC or DC
Conforms to EU directives
Risk of electric shock
Risk of danger. Important
information see manual
Hazardous Voltage
Equipment protected by double
or reinforced insulation
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.
CAT III
Battery Recycling Information
Figure 1. Motor & Phase Rotation Meter
1. Test lead input jack
2. L1, L2, L3 Indicators
3. Clockwise rotation LCD indicator
4. Counter-clockwise rotation LCD
indicator
5. ON/OFF Button
6. ON/OFF Indicator
7. Orientation Symbol
1
2
3
4
MOTOR&PHASE ROTATION INDICATOR
5
6
7

3. Connect the test probes to the three main phases. Press the ON/OFF
button. The green ON indicator shows that the instrument is ready for
testing. Either the clockwise or counter clockwise rotary indicator
illuminates showing the type of rotary field direction present.
4. The rotary indicator lights even if the neutral conductor, N, is connected
instead of the test lead input jacks. Refer to Figure 2 (also shown on the
back of the motor and phase rotation indicator) for more information.
Figure 2. Phase Indication Table (shown on the rear of the Motor
and Phase Rotation Meter)
Non-Contact Rotary Field Indication
For non-contact rotary field indication:
1. Disconnect all test leads from the Motor and Phase Rotation Meter.
2. Position the meter on the motor so that it is parallel to the length of the
motor shaft. The meter should be one inch or close to the motor. See
Figure 3.
3. Press the ON/OFF button. The green ON indicator shows that the
instrument is ready for testing. Either the clockwise or counter clockwise
rotary indicator illuminates showing the type of rotary field direction
present.
Note:
The indicator will not operate with engines controlled by frequency
converters. The bottom of the Motor and Phase Rotation meter should be
oriented towards the drive shaft. See the orientation symbol on the Motor
and Phase Rotation meter
Figure 3. Motor Rotation

3.75
5
6
7.5
10
12
15
20
30
60
85.6
64.2
53.5
42.8
32.1
26.7
21.4
16.0
10.7
5.3
Number of
pole pair
Rotary Number Of Rotary Field
(1/min) at Frequency (Hz)
Angel Between
poles
Min. Ø of
Motorcase
16⅔50 60 cm
1
2
3
4
5
6
8
10
12
16
1000
500
333
250
200
167
125
100
83
62
3000
1500
1000
750
600
500
375
300
250
188
3600
1800
1200
900
720
600
450
360
300
225
See table 2 for the minimum motor diameter and number of pole pair to
obtain a reliable test result.
Table 2. Reliable Motor Test Requirements
Determine the Motor Connection
1. Connect on end of the test leads to the motor and phase rotation meter.
Make sure the L1, L2 and L3 test leads are connected to the
corresponding jack.
2. Connect the croc clamps to the other end of the test leads.
3. Connect the croc clamps to the motor connections, L1 to U, L2 to V, L3
to W.
4. Press the ON/OFF button. The green ON indicator shows that the
instrument is ready for testing.
5. Turn the motor shaft half a revolution towards the right.
Note:
The bottom of the motor and phase rotation indicator should be oriented
towards the drive shaft. See the orientation symbol on the motor and phase
rotation meter. Either the clockwise or counter clockwise rotary indicator
illuminates showing the type of rotary field direction present.
Magnetic Field Detection
To detect a magnetic field, place the motor and phase rotation meter to a
solenoid valve. A magnetic field is present if either the clockwise or the
counter clockwise rotary indicator illuminates.
Note:
The motor and phase rotation meter contains alkaline batteries. Do not
dispose of these batteries with other solid waste. Used batteries should be
disposed of by a qualified recycler or hazardous materials handler.

The motor and phase rotation meter uses a 9V battery. To replace the
battery, follow these steps.
1. Place the motor and phase rotation meter face down on a non-abrasive
surface and loosen the battery-door screw with a screwdriver.
2. Lift the battery access lid away from the meter
3. Observe the battery polarity shown in the battery compartment.
4. Secure the battery access lid back in position with the screw.
Safety Information
Caution identifies conditions and actions that may damage the
MT935. Warning identifies conditions and actions that pose
hazard to the user.
Read First: Safety Information
To avoid possible electric shock or fire, do the following:
• Read the following safety information carefully before using or servicing
the instrument.
• Adhere to local and national safety codes.
• Protective equipment must be used to prevent shock and injury.
• Use of instrument in a manner not specified by the manufacturer may
impair safety features/protection provided by the equipment.
• Avoid working alone.
• When using the probes, keep fingers away from probe contacts. Keep
fingers behind the finger guards on the probes.
• Measurements can be adversely affected by impedances of additional
operating circuits connected in parallel or by transient currents.
• Verify operation prior to measuring hazardous voltages (voltages above
30V AC RMS, 42V AC peak and 60V DC).
• Do not use the meter with any parts removed.
• Do not use the meter around explosive gas, vapor or dust.
• Do not use the meter in a wet environment.
Specifications
Phase Rotation Clockwise or Anti-clock wise
Visual Indication LCD
Operating Temperature 0°C to 40°C
Humidity 15 to 80%
Operating Altitude 2000m
Pollution Degree 2
Type of Protection IP40
Battery 9V
Current Consumption Max 20mA
Dimensions 130 x 69 x 32mm

Weight 130g
Electrical Safety DIN VDE 0411,IEC 61010 DIN, VDE 0413-7,
IEC 61557/EN61557-7
Protection Level CAT III 600V
Rotary Field Direction
Nominal Voltage Rotary 1 to 400V AC
Direction
Nominal Voltage Phase 120 to 400V
Indirection
Frequency 2 to 400Hz
Test Current (per phase) Less than 3.5mA
Non-Contact Rotary Field Indication
Frequency 2 to 400Hz
Motor Connection
Nominal Test Voltage 1 to 400V AC
(U me)
Nominal Test Currents Less than 3.5mA
(per phase)
Frequency (fn) 2 to 400Hz

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South Africa Australia