3M 2250E User Manual

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Dynatel2250E/2273E

Advanced Cable and

Fault Locator

Operators Manual

September 1999

78-8097-6500-7-B

TABLE OF CONTENTS

 

Introduction ...............................................................................

2

Installing or Replacing the Batteries ........................................

2

Initial Receiver Configuration ..................................................

3

Receiver Battery Test ................................................................

3

Transmitter Battery Test ...........................................................

4

Using External DC Power and 5 Watt Output ..........................

4

Locating a Buried Cable ...........................................................

5

Transmitter Setup ................................................................

5

Receiver Setup ....................................................................

10

Determining Cable Depth and Current .....................................

13

Locating Sheath Faults..............................................................

14

Locating an Active Duct Probe .................................................

16

Locating EMS Markers .............................................................

17

Toning Aerial Faults ..................................................................

18

Cable or Pair Identification .......................................................

19

Optional Accessories .................................................................

21

Technical Information ...............................................................

22

Page 1

INTRODUCTION

The 3MDynatel 2250E/2273E Advanced Cable and Fault Locator consists of a Transmitter and a Receiver for locating buried cables or Active Duct Probes (sondes). It also measures and pinpoints sheath faults in buried cables (2273E only) and conductor faults in aerial cables. The transmitter provides four frequencies to accommodate varying factors such as distance, cable type, or soil conditions. If desired, all four frequencies may be transmitted at once. The Transmitter also provides a separate Tone function for identifying cables and pairs. The Receiver provides four locating modes to accomplish fast or difficult tracing and to pinpoint or verify a conductor. The Receiver detects 50 or 60 Hz AC Power signals and low frequency (LF) radio signalsre-radiatedfrom local broadcast transmitters. It also measures the signal current in a conductor and displays its magnitude. The depth of buried cables or sondes may also be displayed.

Note: For more detailed locating instructions and advanced locating techniques, ask your 3M sales representative for a free publication called Cable and Pipe Locating Techniques.

INSTALLING OR REPLACING THE BATTERIES

6'LR14' cells

6 'LR6' cells

Caution!

Do not connect batteries improperly, charge or dispose of in fire. Batteries may leak or explode and cause personal injury. Always remove batteries when storing the units.

Battery Disposal: Since regulations vary, consult applicable regulations or authorities before disposal.

Page 2

INITIAL RECEIVER CONFIGURATION

Display depth units (inches, feet and inches, or centimeters) may be changed while holding and pressing. For each press, one of three units will display. To change the passive Power frequency, press and holdthen pressto toggle between 50 or 60 Hz as displayed in the lower left corner of the display.

To change the Null bar graph display mode, press and hold then

press to toggle between normal Null bar graph display (Null flag will flash) and inverse Null bar graph display (Null flag is solid). See section

About Trace Modes (page 11) for further information.

RECEIVER BATTERY TEST

Battery Test

Indicator

Battery Level

Mark

The Receiver batteries are tested for two seconds every time the unit is turned on. The time interval can be extended by pressing and holding . During the battery test, the bar graph should extend to the right of the battery level mark, otherwise replace the batteries.

Note: When batteries are low, the battery test indicatorwill flash.

Page 3

TRANSMITTER BATTERY TEST

To test the Batteries, press and hold

. Listen to the tone and watch

the display.

 

solid tone and 'OK' indicates batteries good;

beeping tone and 'LO' indicates batteries low;

no tone and '- -'indicates replace batteries.

Note: The battery test indicates battery condition for normal output levels. if the unit resets when the high output level is selected, use the normal output level or replace the batteries.

USING EXTERNAL DC POWER AND 5 WATT OUTPUT

The Transmitter can be operated from and external 12VDC source as well as its internal batteries. Use the supplied cigarette lighter adapter cable to connect the DC power from a vehicle's battery source to the Transmitter's external power jack located next to the output jack.

Note: The internal batteries will not be recharged with external DC.

5 Watt Output

An external DC source is required for 5 watt output. To select 5 watt operation, press once for high output (3W) and again for 5 watt operation. The High Output flag will turn on for 3W and flash for 5W.

Page 4

LOCATING A BURIED CABLE

Transmitter Setup

Note: Key descriptions can be found inside the Transmitter lid.

Perform a battery test and then connect the Transmitter using one of the three methods below to put tracing signal on a cable.

Danger!

Voltage higher than 240 volts will damage equipment and cause personal injury and death. Make all direct test connections before turning on the Transmitter. Then activate the Transmitter in the Ohms mode and check the display for voltage readings. Follow standard procedures for reducing the voltage.

Warning!

Potential for electrical shock exists when handling connecting cables while the Transmitter is in the TRACE, FAULT or TONE modes. Turn the transmitter off before handling connecting cables.

Page 5

DIRECT CONNECT METHOD

Make sure the Transmitter is off. Plug the Direct Connect Cable into the front panel jack. Connect the Black clip to the ground rod. Place the ground rod in the earth perpendicular to the suspected cable path. If necessary, extend the black lead with the Ground Extension Cable. Next, remove the ground bonding and attach the Red clip to the shield.

Note: Never attach or remove the direct connect cable from the Transmitter front panel jack while the red and black clips are connected to a cable.

Press to turn the Transmitter on in the Ohms mode. It will measure the continuity of the cable under test. The results are displayed in ohms and as a tone (solid tone = good ground; beeping tone = usable ground; no tone = poor or no ground).

Note: In the ohms mode, the Transmitter can detect voltage as well as ohms. If voltage is detected, the display will alternate between displaying ohms and volts. When displaying ohms, the flag over the will be visible. When displaying volts, the flag over the 'V' will be visible. When the voltage magnitude is sufficient to impair the accuracy of the ohms measurement, only voltage will be displayed. If the voltage is AC, a sine wavewill be visible on the display. If a high AC voltage is detected, a rapid beeping tone will be heard.

Page 6

Press

to select Trace mode. Press again to select one or all of the

four frequencies. The display will alternate between displaying the selected frequency and the output signal current. It is best to choose the lowest frequency for direct connect with far-endground and a high frequency for direct connect with nofar-endground.

Press

to select high output level for longer tracing distances and

deep cables.

Transmitter setup is finished, now go to LOCATING A BURIED

CABLE - RECEIVERSETUP(PAGE10).

Page 7

DYNA-COUPLERMETHOD

Cable Path

Connect the Dyna-Couplerto the Transmitter front panel jack using the coupler cable.

Clamp the Dyna-Coupleraround the cable below any bonds just before cable enters the earth. The jaws of the coupler must fully close.

Press to turn Transmitter on. Press again to select 8 kHz, 33 kHz or 133 kHz.

Select high output level by pressing . Transmitter setup is finished, now go toLOCATING A BURIED CABLE - RECEIVER SETUP (PAGE 10).

Page 8

INDUCTION METHOD

Place the transmitter on the ground over the target cable with the lid hinge in line with the cable path. Press to turn the Transmitter on.

Press again to select either 33 kHz or 133 kHz. For greater tracing range, select high output level by pressing .

Note: If the Receiver is less than 15 meters from the Transmitter, it can pick up signal through the air. For best results, keep the Receiver away from the Transmitter by at least that distance.

Transmitter setup is finished, now go to LOCATING A BURIED CABLE

- RECEIVERSETUP(PAGE10).

Page 9