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Section 6–ATM200-002 Actuator Issues Remote Electrical Downtilt System Handbook

6-2 May 2009 Bulletin 639519 • Revision D

• Daisy chain good actuators one pair at a time to test output connection of actuators.

• Check actuator female connector.

• Isolate and eliminate other devices in cable path until problem device is found (e.g., output con-

nector of junction box, jumper cable).

• If cable path to outmost device exceeds 200 meters and all devices/cables are good,

reconﬁ gure the path for shorter cable path.

• Defective TMA (see Section 12) or smart bias tee (see Section 11).

• Verify that surge arrestor, such as APTDC-BDFDM-DB or APTDC-BDFDF-DB, for a sector is not

dc ground but passes dc voltage.

6.3 Actuator Reports Permanent Jam

• There is a “temporary” jam which corrects itself.

• A report of a “permanent” jam is a problem.

• If ﬁ eld-installed:

• Compression ring may still be present.

• Actuator was not attached to downtilt rod correctly (see Instruction Bulletin #639526).

• Actuator was set to incorrect angle when attached to downtilt rod (angle shown in bushing

should match angle that the actuator is set for – generally, max tilt angle).

• Remove actuator. Verify antenna is OK by certifying that tilt rod moves freely (about 2-3 lbs. max

force) from max to min tilt. Test actuator while detached. If the permanent jam remains, replace

the actuator.

• If actuator is factory-installed:

• Isolate the actuator (i.e. not daisy-chained or connected by a junction box or splitter to

another actuator).

• Retest the actuator

• If you still get the “permanent” jam, replace the antenna. (See Note 2 at the beginning of this

section.)

6.4 Angle Displayed in Antenna Bushing Window Does Not Match

Angle Reported by Controller Software

• A mismatch of ±0.1° is not a problem.

• Check that actuator is conﬁ gured with correct antenna model.

• Field-installed actuator was not set to correct angle before attaching to the antenna.

• Re-attach actuator so that the angle reported by the controller software initially matches the angle

displayed in the antenna bushing window.

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Andrew ATC200-Lite Guía para resolver problemas Pagina 38