WSM6 Manual
Document Ref: UM-8270-000
Issue: A Rev 0
Section 3
18
3.4.1 Fast Charging
The Fast Charge feature is controlled by electronics inside the transponder which monitors the
voltage and temperature of the battery pack to decide when to stop charging. The parameters are
first monitored some six minutes after connection so connecting the fast charger to a fully charged
battery will allow the full charging current to flow for that length of time.
Repeatedly connecting the fast charger to a fully charged (or near fully charged) battery will reduce
the life of the battery and may cause damage.
The charge control chip, within the transponder, will cut off charge current if:
The rate of change of voltage with time indicates the pack is approaching full charge
The temperature of the pack rises outside limits (10-40 ºC)
A time limit is exceeded (in the WSM6 case this is 6 hours)
The current during fast charging is limited by the WSM6 PSU, not by the WSM6 charger/comms
unit. The WSM6 has a 2000 mAh battery but charging is only recommended at 500 mA. Faster
charging is likely to affect the number of charge cycles that a pack will achieve in its lifetime.
If, in an emergency, it is necessary to charge the WSM6 by means other than the Type 7972-000-
04 dedicated comms/charger unit, then the charge supply should be 24 V at 500 mA constant
current for 4 hours maximum. Note that the charging time must be reduced if the battery pack has
been charged recently. The charging current should be applied to pin 3 of the external connector
with the return (zero volts) connected to pin 2.
Figure 3-14 – Charger Connections
1
AC cable option part numbers: UK 272-
0345; US 272-036C; Euro 272-0352
3 WSM6 Charger/Comms
2 WSM6 Charger PSU 4 WSM6
October 2011
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