Original instruction notice
18
NOT-MC89-EN-2020-v1
b.
Potential problems when actuating a valve
1 – If the actuator sounds a “beep” it means that the required torque is higher than the torque limit set. Increase
progressively the torque limit and try again.
Make sure that the torque limit set doesn’t exceed the valve maximum allowed torque
2 – If the actuator is still unable to start even with a high (or maximum) torque limit, the valve may be fully open or closed
and the selected direction of rotation may not be correct. In this case, repeat the procedure from the beginning by changing
the direction of rotation of the actuator.
Check again the direction of the torque retention.
3 – In case of resistance resulting from deposits on the stem, turn the valve in both directions several times to ‘clean’ it.
modec
revolution counter (optional) enables you to always know which position the valve is in.
4 – When the closed position is reached, make sure the torque does not exceed the valve maximum allowed torque. Unless
the procedure indicates otherwise, reopen the valve with a few turns so that the accelerated fluid “cleans” any potential
impurities from the valve, then close it again at the desired torque.
5 – When the maximum open position is reached, reclose with a few turns to avoid the valve getting stuck in future. Doing
this also means that the valve is still able to turn when next actuated even if the operator turns it the wrong way, which again
helps prevent the valve being stuck.
With the MC89, for any torque setting, the closing torque (D1) will always be lower than the maximum opening torque (D2),
in order to guarantee the reopening of the valve. Use the torque limiter to keep values consistent with the effort required
and not oversized.
8. Revolution counter (option)
PRESENTATION
The digital Revolution counter adds up the
revolutions in one direction and subtracts
them in the other direction in such a way that
the operator always knows where he is in
relation to the initial set-up. The tool also
measures and shows the rotational speed.
Nota 1 : The instant speed indicator needs several revolutions before it can give a stable and regular speed. In light of this,
you have to wait several seconds to get a reliable reading.
Nota 2 : The screen turns itself off after 5 minutes.
HOW IT WORKS
«
Revolution count mode ‘’t’’ »
«
Speed mode ‘’s’’ »
3 s
« Reset to zero »
« ON »
Screen
« SET »
« MODE »
