Major tech MT935 Manuale utente

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

MOTOR&PHASE ROTATION INDICATOR

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

7.5

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

1000

500

333

250

200

167

125

100

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

www.major-tech.com www.majortech.com.au

[email protected] [email protected]

MAJOR TECH (PTY) LTD

South Africa Australia

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