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BECKHOFF
8
Electrical Installation
8.1
Important Notes
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Never disconnect the electrical connections to the servo amplifier while it is live. In
unfavourable circumstances this could result in destruction of the electronics.
Residual charges in the capacitors can have dangerous levels up to 300 seconds
after switching off the mains supply voltage. Measure the voltage in the DC bus
link (+DC/-DC), and wait until the voltage has fallen below 40V.
Control and power connections can still be live, even when the motor is not
rotating.
AX2040/2070 Product Manual
Check the combination of servo amplifier and motor. Compare the rated voltage and current
of the units. Carry out the wiring according to the connection diagram on page 39.
Make sure that the maximum permissible rated voltage at the terminals L1, L2, L3 or +DC,
–DC is not exceeded by more than 10% even in the most unfavourable case
(see EN 60204-1 Section 4.3.1). An excessive voltage on these terminals can lead to
destruction of the regen circuit and the servo amplifier.
The use of external mains chokes and mains filters is required.
The fusing of the AC supply input and the 24V supply is installed by the user (ð p. 19).
Route power and control cables separately. We recommend a separation of at least 200mm.
This improves the interference immunity required by EMC regulations.
Install all shielding with large areas (low impedance), with metallised connector housings or
shield connection clamps where possible. Earth (ground) the shielding at both ends (ðp.45).
Notes on connection techniques can be found on page 40.
Feedback lines may not be extended, since thereby the shielding would be interrupted and
the signal processing could be disturbed.
The cable between servo amplifier and regen resistor must be shielded.
Install all heavy-current cables with an adequate cross-section, as per EN 60204 (ð p. 20)
and use the requested cable material (ð p. 41) to reach max. cable length.
Wire the BTB/RTO contact in series into the safety circuit of the installation. The safety cir-
cuit must control the mains relay. Only in this way is the monitoring of the servo amplifier
assured.
It is permissible to alter the servo amplifier settings by using the setup software.
Any other alterations will invalidate the warranty.
06/2007
Electrical Installation
37
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