BECKHOFF AX2500 - Manual (Page 37)

8 Electrical Installation
8.1 Important notes
l Not more than 7 axis modules can be connected to a master module.
l Check the combination of servo amplifier and motor. Compare the rated voltage and
current of the units. Carry out the wiring according to the instructions on page 39.
l Make sure that the maximum permissible rated voltage at the terminals for L1, L2, L3
and +R
Bext
, –DC is not exceeded by more than 10%, even in the most unfavourable
conditions (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.
Use the AX251x only on an earthed 3-phase supply system. Use the amplifier only to
drive a synchronous servomotor.
l The fusing of the AC supply input and the 24V supply is installed by the user
(
ð p.19).
l Route power and control cables separately. We recommend a separation of at least
20 cm. This improves the interference immunity required by EMC regulations. If a
motor power cable is used which includes cores for brake control, the brake control
cores must be separately shielded. Earth the shielding at both ends (
ð p.45).
l Install all heavy-current cables with an adequate cross-section, as per EN 60204-1
(
ð p.20) and use the requested cable material (ð p. 41) to reach max. cable length.
l Wire the BTB/RTO contact in series into the safety circuit of the installation.
Only in this way is the monitoring of the servo amplifier assured.
l Install all shielding with large area (low impedance) connections, with metallised con-
nector housings or shield connection clamps where possible.
Notes on connection techniques can be found on page 40.
l It is permissible to alter the servo amplifier settings by using the operator software.
Any other alterations will invalidate the warranty.
Caution
Never disconnect the electrical connections to the servo amplifier while it is live.
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 (+R
Bext
/-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.
AX2500 Product Manual 37
BECKHOFF
06/2007
Electrical Installation