NOTES ON COOLANT (REFERENCE)

5.5.2.9 Screw tightening torque

The screws of the servo amplifier are tightened with the following torque:

Screw size Tightening torque (Nm)

M4 1.1 to 1.5

M5 2.0 to 2.5

M6 3.5 to 4.5

M10 15 to 16

5.6 NOTES ON COOLANT (REFERENCE)

Cutting fluid containing highly active sulfur, oil-free cutting fluid called synthetic cutting fluid, or highly alkaline, water-soluble cutting fluid in particular significantly affect the CNC, motor or amplifier. Even when these components are protected from direct spraying of cutting fluid, problems as described below may arise. So special care should be taken.

• Cutting fluid containing highly active sulfur

Some of cutting fluids containing sulfur include extremely highly active sulfur. If such a cutting fluid penetrates into the CNC, motor, or amplifier, it can corrode copper, silver, and other metallic materials of components, therefore resulting in component failures.

• Synthetic cutting fluid with high permeability

Some synthetic type cutting fluids that use polyalkylene glycol (PAG) as a lubricant have extremely high permeability. Such cutting fluids easily penetrate into a motor even if it is well closed. When this type of cutting fluid penetrates into the CNC, motor, or amplifier, it can lead to insulation degrading and component failures.

• Highly alkaline, water-soluble cutting fluid

Some cutting fluids that strengthen pH by alkanolamine show strong alkalinity of pH10 or higher when diluted to the standard level. If such a cutting fluid penetrates into the CNC, motor, or amplifier, it can cause a chemical reaction with plastic or other materials, therefore degrading the materials.

5.7 HOW TO ATTACH THE SERVO AMPLIFIER GASKET

5.7.1 Preparation

This section describes the procedures and precautions for attaching the gasket that is used to install a servo amplifier in a power magnetics cabinet. Please read the following description before installing your servo amplifier.

Before installing your servo amplifier, unfold the gasket supplied with the servo amplifier into a rectangle, as illustrated in Fig. 5.7.1 (a). This gasket is intended to ensure seal-up. If the gasket is cut to separate each side from others, seal-up will be impaired. Therefore, be sure to use the gasket without separating the four sides from each other. There is no distinction between the top and bottom of the gasket.

Fig. 5.7.1 (a) How to unfold the gasket Gasket for 60 mm-wide servo amplifiers

Gasket for 150 mm-wide servo amplifiers Gasket as delivered

Gasket as delivered

5.7.2 How to Attach the Gasket to the Panel Cut-out of the Power Magnetics Cabinet

Attach the gasket so that the gasket's inner edge aligns with the edge of the panel cut-out, as illustrated in Fig. 5.7.2 (a) or 5.7.2 (b).

If the backing paper on the back of the gasket is peeled off at one time, a part of the gasket may stick to another part of the gasket, or the gasket may be elongated. Peeling off the backing paper step by step improves workability. Workability improves also by positioning the gasket by attaching the top and bottom sides first.

Fig. 5.7.2 (a) How to attach the gasket to the power magnetics cabinet Gasket for 60 mm-wide servo amplifiers (or gasket for 90 mm-wide servo amplifiers)

Gasket attached with its inner edge inside the edge of the panel cut-out

Gasket attached outside of the edge of the panel cut-out Gasket attached with its inner edge aligning with the edge of the panel cut-out

Attach the gasket about ±1 mm apart from the edge.

Example of good work

Example of poor work

Edge

Edge Edge

Fig. 5.7.2 (b) How to attach the gasket to the power magnetics cabinet

Gasket for 150 mm-wide servo amplifiers (or gasket for 300 mm-wide servo amplifiers) Gasket attached with its

inner edge inside the edge of the panel cut-out

Gasket attached outside of the edge of the panel cut-out

.

Gasket attached with its inner edge aligning with the edge of the panel cut-out

Attach the gasket about ±1 mm apart from the edge

.

Example of good work

Example of poor work

Edge

Edge

Edge

5.7.3 How to Attach the Gasket to the Servo Amplifier

Convexities are provided at the top and bottom of the back face of the servo amplifier flange in order to maintain appropriate gasket thickness. Attach the top and bottom sides of the gasket along the inner edges of these convexities, as illustrated in Fig. 5.7.3 (a) or 5.7.3 (b). When performing this work, be careful for the gasket not to get on these convexities. The left and right sides of the gasket should be attached along the edge faces of the flange.

If the backing paper on the back of the gasket is peeled off at one time, a part of the gasket may stick to another part of the gasket, or the gasket may be elongated. Peeling off the backing paper step by step improves workability. Workability can be improved also by positioning the gasket by attaching the top and bottom sides first.

It is recommended, however, that the gasket should be attached to the power magnetics cabinet, rather than the servo amplifier, to ensure the positional accuracy of attachment.

Fig. 5.7.3 (a) How to attach the gasket to the servo amplifier Gasket for 60 mm-wide servo amplifiers (or 90 mm-wide servo amplifiers)

Convexity on the flange back face

Diagonally shaded part:

Gasket

Attach the left and right sides of the gasket along the edge faces of the flange.

Attach the top and bottom sides of the gasket along the inner edges of the convexities on the flange back face

.

Fig. 5.7.3 (b) How to attach the gasket to the servo amplifier

Gasket for 150 mm-wide servo amplifiers (or gasket for 300 mm-wide servo amplifiers)

Convexity on the flange back face

Diagonally shaded part:

Gasket

Attach the left and right sides of the gasket along the edge faces of the

flange. Attach the top and bottom sides of the gasket along the inner edges of the convexities on the flange back face.