Mitsubishi Electric ECOV-X37VA Manuel D'installation page 45

[4] Precautions for screwing
When replacing electrical parts inside the control box, use the following recommended tightening torques for screwing.
Recommended tightening torque
Power supply terminal block (TB1)
Auxiliary terminal block (control lines 1 to 32)
Auxiliary terminal block (transmission lines +, -, SG)
Follow the procedure below to check that the screws are properly tightened.
1. Check that the spring washers are parallel to the base.
If a screw is not tightened straight, tightening the screw with the specified torque is not sufficient to ensure correct screw-
ing.
Loose screwing
2. If wires are connected, make sure that they are not loose on the screw terminals.
3. Tighten the screws straight so as to prevent the screw's threads from being damaged.
To prevent screws from being tightened diagonally, mate the flat sides of the round terminals when attach-
ing.
4. After tightening the screws, mark the screw head, washer, and terminal with a check using a marker.
(Example)
Mark a check.
Screw
Correct screwing
Daisy-chain wiring
Power supply line, transmission line
Mate the flat sides of the round terminals.
Power supply terminal block, transmission line terminal block
45
Recommended tighten-
ing torque (Nꞏm)
M6 4 to 5.4
M3.5 0.82 to 1.0
M4 1.0 to 1.3
Spring washers are parallel to the base.
WT09614X03_GB