Specifications

25745-838-B0-001

3.0 Installation Instructions for Speciﬁ c Power Supplies, continued

3.4 Alpha/Lectro ZTT+ Series Power Supply

There are two forms of the Lectro ZTT+ Series power supplies. You can easily identify one

type from the other by checking the round 6-pin DIN connector located on the lower left side

of the front panel:

Early units have a solid black DIN connector.

Later units, including those being produced now, have a silver band around the DIN

connector.

•

Early unit with solid black connector

Present unit with silver band on connector

Fig. 3-10, Lectro ZTT+ Series Power Supplies

Procedures for installing the XP-EDH-A with both types of Lectro ZTT+ Series power supplies

follow and are differentiated by a silver or black designation.

3.4.1 Alpha/Lectro ZTT+ Installation (Silver and Black)

If commercial power is present at the site and the power supply is currently

power supply.

Installing the XP-EDH-A transponder at Alpha/Lectro ZTT+, or ZTT sites requires temporarily disconnecting

the output of the power supply to the cable plant to insert one of the transponder harnesses in series with the

power supply output. This is necessary so the transponder can measure both the output voltage and output

current.

If a short power interruption is not feasible, you must use an alternate source of system power during the

installation of the transponder.

CAUTION!

Locate the transponder interface cable with the 6-pin type DIN connector. This

harness has a selectable switch near the silver 6-pin shell. Place the switch in

the ZTT+ Silver position or in the Black position depending on what type of power

supply you are using.

Make all other harness connections following the diagram in Fig. 3-11.

If a site tamper switch is employed, connect the two lugs within the harness to

the connections on the door switch.

Place the DC breaker back to the ON position.

NOTE:

Turning the battery breaker OFF disables the standby power supply.