Rev 8, Dated 27-2-2018
15
Problem
6.
Treadmill elevates /de-elevates slightly
Possible causes:
1. AC/DC card not working.
2. Capacitor 33uf/440 volt becomes leaky/faulty.
3. Ac motor may be faulty.
Solutions:
1.
Switch off treadmill; remove TPC cable from treadmill end.
2.
Remove back cover of treadmill.
a.
Switch ON the treadmill; short pin no. 1 & 7 of 15- pin d
type connector.
b.
Here if the treadmill does not elevate up and the relay on
the ac/dc card is also not making any clicking/audible
noise, the ac/dc card is faulty and needs to be replaced.
c.
The same is also applicable for de-elevation. Short pin
no. 1 & 8 of 15- pin d type connector.
d.
Here if the treadmill does not come down and the relay
on the ac/dc card is also not making any clicking/audible
noise, the ac/dc card is faulty and needs to be replaced.
3.
In continuation to above test, if the relay on the ac/dc card is
making any clicking /audible noise, and the elevation/de-
elevation is taking place by a very small amount, then the
33uf/440 volt capacitor need to be replaced.
4.
So change the capacitor by a new one. This capacitor is to be
changed directly. It cannot be tested on multimeter or on 230-
volt ac supply alone. Check Input voltage to ACDC it should not
be less than 180 v.
5.
If treadmill is elevating and de-elevating properly independently
from 15 pin d type female connector, but elevating or de-
elevating slightly in test treadmill or calibration program, then
STWIN amplifier needs to be replaced. First of all check 10k 10
turn pot setting.
6.
Even after changing the capacitor, the elevation /de-elevation
does not takes place, the ac motor need to be checked.
7.
For this, switch off the treadmill; remove mains 230-v supply to
treadmill. Mark the connection details of three wires according to
their position. (Color-coding cannot be mentioned because out of
three wires, 2 wires are green. And if these wires are
interchanged, instead of elevation, de-elevation will take place.
Here if treadmill is already at ground level, further de-elevation
will not take place and you will get confused) Isolate the three
wires coming from ac motor. Measure the resistance between all
pairs of these 3 wires. You should get resistance around 28
ohms. If you get zero resistance or infinite resistance, ac motor
is faulty and needs to be replaced.
How to check AC motor independently:
1. Remove three wires coming from AC motor to ACDC drive
2. Put grey wire in neutral and red wire on live for elevation up
3. Put grey wire in neutral and black wire on live for elevation down
Warning: Do not put red and black wire at a time, it will burn
motor.
Material
Req.
AC/DC drive, capacitor, ac motor, 10k pot, silicon oil (200ml).
