Thermo EPD Mk2, Technical Handbook

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EPD/HB/40521/000
ISSUE 5
EPD TECHNICAL HANDBOOK Page 7
General Precautions and Instructions
Always fit new undamaged batteries of the correct type (see section 6.2).
A time
interval of at least 10 seconds must elapse between removal and replacement of the
EPD battery (this allows the internal circuits of the EPD to power-down).
The EPD is fitted with either a security-type (tamper-proof) battery cap or a coin-
release battery cap, depending on customer requirements (see Figure 2.2). The
security-type battery cap restricts unauthorised removal of the cap and requires a
special tool. The coin type battery cap should be rotated using a small coin circa 20
mm diameter and 2 mm thick.
Figure 2.2 - Battery Cap Types and Special Tool
The battery cap also provides the return path for the EPD’s power supply.
Therefore, during fitment of either type of battery cap the EPD will begin its start-up
sequence (see Section 2.1.3). If the battery cap is not fitted cleanly and contact is
temporarily broken, the software initialisation process may not be successful. Under
these circumstances it is essential that the battery cap is removed and that a time
interval of at least 10 seconds elapses before any attempt is made to refit the battery
cap.
Inserting/Replacing The EPD Battery
Caution:
Take care when removing the EPD battery cap, the cap may spring free with
unexpected force.