NASAN ST WIN, Руководство по обслуживанию

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Rev 8, Dated 27-2-2018 11
Problem
5. Fuse blows as speed goes on increasing.
Background:
1. In our treadmill, the magnetic ring acts as a speed sensor (Refer
fig 5). Our software takes feedback from treadmill to know the
actual speed.
a. If the actual speed is more than required by protocol, the
software sends signal to treadmill so as to reduce the
speed.
b. If the actual speed is less than the required by protocol,
the software sends signal to treadmill so as to increase
the speed (attain the required speed).
Possible Cause:
If the speed sensor is broken or not at appropriate position the
feedback will be zero and the PC will consider that the actual speed is
zero. Hence the PC will keep on increasing the speed of treadmill
resulting in large current drawn by ac/dc drive. This cumulative action
will result in blowing of the fuse.
Check that current limit in each stage is normal, If there is a problem in
ac/dc drive then it will take large current then normal in that case
blowing of the fuse may occur.
Solution:
Change the broken speed sensor or magnet if needed.
Material
Req. Fuse, sensor coil, magnet, and ACDC drive, silicon oil (200ml).
Problem
6.
Jerk in speed/Speed reduces as patient walks on treadmill.
Possible causes :
1. No silicon oil below conveyor belt.
2. AC/DC drive unable to provide sufficient current to dc motor.
3. Interference of DC choke radiation with speed sensor feedback.
(Wrong increased speed feedback to PC).
4. Conveyor belt might be loose.
Solution:
1. Add silicon oil (50-100ml)below the belt from both sides.
2. Here, run test treadmill software, increase the speed up to 10
km/hr in steps of 1 km/hr. And ask a person to walk on
treadmill. Here the actual speed is reducing; adjust
compensation trim pot (p1) slightly so that sufficient current is
supplied to dc motor (Refer Fig 9).
3. After trying above two points, if still speed reduces as patient
walks on treadmill, interchange the two wires connected to
choke.
Material
Req. Silicon oil (200ml), sensor coil/ACDC drive.