GRASEBY Ms 16A Infusion Pump Service Manual - internetMED

Volts
MS16A Syringe Driver
Smiths Medical
To measure the motor interval time, a conventional scope with a good
trigger is required; a storage scope would be better. Using the
variable power supply, place a 4R7 ohm resistor in the negative
supply line, and with a x10 scope probe, measure the voltage across
the resistor.
Run the pump at maximum rate and compare each consecutive pulse
over six pulses. Figure 5-3 illustrates the typical waveform expected.
The motor run time is measured from the start of the plateau to the
trailing edge of the waveform, where it is cut off by the cam’s action.
0.16
MS16 Motor Pulses
0.14
0.12
0.10
0.08
0.06
0.04
0.02
Cam Period
5
0
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65
GM0105_8044-GB-B
Time (seconds)
Figure 5-3 Typical waveform for one pulse
The variation in duration of the six consecutive pulses in each
revolution should not be more than 20%. If necessary, adjust the
motor run-time ratio by a slight bending of the cam follower lever,
using tool part number 0105-0079. Use the tool as shown in Figure 5-4
to tweak the operating lever so as to mimimise the error.
Note that the time interval between successive pulses may vary
slightly. This is not a controlled parameter, and variation is
permitted.
5 — 6
Issue 6 (February 2005)
Technical Service Manual