User guide

Chapter 1
Features, Installation, Powerup
1–5
2. Install the battery, catalog number 1747–BA. The battery compartment is
next to the memory pak compartment.
!
ATTENTION: The letter B appears flashing on the prompt line
of the HHT display if the battery is not installed correctly or the
battery power is low; in addition, each time you power up, the
self–diagnostic is interrupted, and the prompt BATTERY TEST
FAILED appears.
To prevent this from happening, leave the “battery low defeat
jumper” inserted in the battery socket. The HHT is functional,
but your user program is cleared from memory when you
de–energize the HHT. If you do not download the user program
to the processor before you de–energize the HHT, your program
will be lost.
a. Remove the jumper from the battery socket, then connect the battery
as shown in the figure below:
Backside of HHT
Battery Compartment
Plug battery connector
into socket (red wire up).
Secure battery
between clips.
.
.
b. Replace the cover.