User manual

LT Series User Manual 9

Preface

• The LT uses a lithium battery to back up its internal clock

and to control memory data. If the battery is incorrectly re-

placed (reversed positive [+] and negative [-] ends), the bat-

tery may explode. Therefore, Pro-face recommends that you

contact your local LT distributor for instructions before re-

placing or changing the battery.

• Do not attempt to modify the LT unit’s internal parts or wir-

ing in any way, since this may lead to either electrical shock

or fire.

Wiring Layout Cautions:

• To prevent an LT unit malfunction due to excessive noise,

isolate all LT input/output signal lines from all power wir-

ing or power cables via a separate wiring duct.

Installation Cautions:

• To reduce the risk of incorrect input or output signals, be

sure that any data cables attached to the LT unit’s connec-

tor make full contact with the connector pins.

General Wiring Cautions

• To prevent electrical shocks or malfunctions, be sure the

LT unit’s FG (earth) wire is grounded as follows:

(1) maximum grounding resistance: 100

ΩΩ

Ω

(2) minimum grounding wire diameter: 2mm

• The LT unit’s wiring should be checked to confirm that both

the operating voltage and wiring terminal locations are cor-

rect. If either the voltage or the wiring terminal location is

incorrect, it can cause a fire or accident.

• Be sure to secure all wiring terminal screws with the des-

ignated torque. Screws and terminals that become loose

can cause a short circuit, fire, or accident.

CAUTIONS

WARNINGS