Smiths Medical Medfusion 3000 Series, Technical & Service Manual

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Scheduled Maintenance
24
40-5648-51B
Battery maintenance
This chapter discusses battery maintenance as recom-
mended to ensure good battery performance.
1. The battery pack contains six 2100 mAH Nickel
Hydride (NiMH) cells (older pumps may have
Nickel Cadmium [NiCad] batteries) with a smart
gauge for monitoring battery charge information.
Notes
:
• The gauge is built into the battery pack, and the
pump reads the battery capacity from the gauge on
the pack .
• The battery pack has a shelf life of 4 months, after
which it will require recharging. Once installed into
a pump, the shelf life is 2 months, after which it will
require recharging.
2. There are two measured battery parameters that
must be reviewed to maintain good battery per -
formance and accuracy of the battery gauge.
From the Main menu, use the number buttons to
choose
Biomed
; use the
number
button to choose
Diagnostics ; use the number buttons to choose
Monitor Battery Status
option.
a) LMD (Last Measured Discharge) − This the
learned capacity of the battery by the gauge fol -
lowing a calibration cycle. It is recommended
the battery be replaced when this value is < 1600
mA-hours
.
b) CPI (Capacity Inaccurate) −
This is the
number
of shallow discharge cycles since the last calibra-
tion. It is recommended that you recalibrate the
battery when CPI is > 80 hex (i.e. >128 decimal) .
Refer to the battery calibration section below.
Shallow discharge (CPI) record
The battery gauge records the number of shallow
discharges. A shallow discharge happens whenever the
battery is partially discharged and then returned to
AC power. The number of the shallow discharges ap -
pears on page two of the
Monitor Battery Status
menu in the Biomed > Diagnostics menu.
•
This displays CPI as 0×DD, where 0×DD is a
hexadecimal number representing the number of
shallow discharges cycles.
•
The value is reset to zero each time the battery is
calibrated. It increments to a maximum count of
0×FF hex (255 decimal).
During the annual periodic maintenance if the num -
ber of shallow discharges, CPI, is 0×80 hex or higher
[e.g. 0×90, 0×A5, 0×BB, etc.], then the battery should
be re-calibrated.
Battery calibration procedure
The battery calibration procedure ensures the battery
calibrates (or “re-learns”) the battery capacity. It does
this by measuring the actual charge & discharge rates
to determine the true capacity of the battery. With this
correct information, the pump calculates “percentage
of battery charge” and determines “low battery alarm”.
1.
Connect the pump to AC power.
2.
Turn the pump on and select
Biomed
>
Diag-
nostics
>
Monitor Battery Status
.
3.
After the Charge Level gauge reaches 99 to 100%,
wait at least 1 more hour, then remove AC power.
4.
Using one of the methods listed here, fully drain
the battery pack, until the pump sounds the
Bat-
tery Depleted alarm (not the Low Battery
alarm). You can interrupt the discharge test by
turning the pump off and continue discharge at a
later time – as long as you do not plug the pump
into AC power during the discharge cycle.
a) The battery can be discharged by operating the
pump on battery power and infusing at 5 ml/hr
using a 60cc syringe. This takes approximately 10
hours
from a full charge.
b) A quicker method is holding open the clutch
lever with an a clamp or vise grips to prevent the
plunger flipper and clutch from closing. Then
use Biomed > Diagnostics > Motor Drive
Test
, and set motor step period to 2 msec, and
press
É
. This should deplete the battery within
approximately 3 hours .
c) A third method is to disconnect AC power, turn
the pump on, and run
Biomed
>
Diagnostics
> Monitor Battery Status . This discharges
the battery at about 130 ma, and takes approxi -
mately
13 hours
from full charge.
5.
Once the
Battery Depleted
alarm sounds,
turn the pump off and plug into AC. This begins
recharging the battery. [
Do not unplug AC power
until charging is complete. ]
If left in “Depleted” alarm condition, the pump will
draw power from the battery until its voltage drops