Service Manual
MDE 252 Rev. 1
December 2021
Troubleshooting
5
Section 2: Troubleshooting
2.2.2
Alarm on Local Display: High Torque in Opening
HIGH TORQUE IN OPENING
Engage the handwheel and verify if the handwheel is completely
blocked in the opening direction.
For extraordinary repairing activity, please contact Biffi.
1.
The measured torque is greater than the relevant value configured in torque set-up or stroke limits routine.
2.
The actuator can operate in closing direction. An electrical command in close direction clears the alarm.
3.
Check the valve and the torque needed to move the valve.
4.
Check the torque limits in actuator setup, stroke limits and torque setup.
5.
Increase the torque limit only if valve stem can accept more torque/thrust/without any damage .
6.
Verify if the opening command performs well.
1.
Switch off the actuator.
2.
Remove the actuator from the valve
by leaving the coupling thrust block
fixed onto the valve.
3.
Turn the selector in local.
4.
Switch on the actuator.
5.
Push open button in order to verify
if the actuator moves without
the valve.
6.
If the actuator moves well,
please check carefully the
valve or the valve/actuator
mechanical connection.
Please verify (in sequence):
1.
Speed sensor (see VCIOM-08500)
2.
Cable from speed sensor to
logic board
3.
Logic board (if brand new board is
installed, please make sure that the
proper configuration is relevant to
the S/N)
4.
Power card;
5.
Mechanical transmission between
the electric motor and the drive
train (see VCIOM-08500)
Alarm Disappear?
YES
YES
NO
NO
The suggested actions
have solved the problem
