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Danger from moving
parts
Danger !
Replacing units
Caution !
• DOK-POWER*-TVD*1.3****-ANW1-EN-E1,44 • 02.97
6. Troubleshooting
Source of danger:
Unexpected and unintentional axis movements!
Possible consequences:
Danger to life and limb and property damage! Problems with the
machine and when locating the problem represent, in particular,
situations with an increased risk.
How to avoid:
Personnel must not remain in the hazardous area of the installation.
Protective devices such as safety screens, covers and light barriers
must not be disabled. There must be free, ready and easy acess to
the E-stop button.
Required for replacement are:
• a lifting device (dependent upon the weight of the device to be replaced)
• and a replacement unit of the same type.
Please comply with the procedures below:
1. Shut the power to the machine off and secure the device against being
unintentionally or accidentally switched back on.
2. Using suitable equipment, check whether the machine is not conducting
electricity. Wait the discharge time. Motors must be standing still. Vertical
axes must be secured agianst movement.
3. Using the rating plate, make sure that both units are the same. The
replacement unit must be of the same type as the unit being replaced.
4. Release all connections of the defective unit.
5. Release the fixing screws and remove the unit from the control cabinet. Use
the lifting device, e.g., a crane, if necessary.
Source of danger:
Electrostatic discharges are possible!
Possible consequences:
The discharge could damage electronic components and equipment.
How to avoid:
Before replacing plug-in modules, touch a grounded object such as
the control cabinet door. This discharges the human body.
6. Hang the replacement unit onto the fixing screws by using the lifting device.
Tighten the screws.
7. Reconnect the unit as per the interconnection diagrams of the machine
manufacturer.
8. If vertical axes have been secured prior to the replacement procedure, then
remove the device with which these were secured.
The replacement is completed. The machine can be restarted.
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