Electrical installation
91
Safe torque off (XSTO)
For the drive to start, both connections (OUT1 to IN1, and OUT2 to IN2) must be
closed. By default, the terminal block has jumpers to close the circuit. Remove the
jumpers before connecting an external Safe Torque Off circuitry to the drive. See
page 71.
Control cable connection procedure
See the cable routing on page 92 and connect the control cables as follows:
1. Ground the shields of all control cables connected to the control unit at the clamp
plate. The shields should be continuous as close to the terminals of the control
unit as possible. Only remove the outer jacket of the cable at the cable clamp so
that the clamp presses on the bare shield.
2. Connect the conductors to the appropriate detachable terminals (see page 87) of
the control unit. At the terminal block, use shrink tubing or insulating tape to
contain any stray strands. The shield (especially in case of multiple shields) can
also be terminated with a lug and fastened with a screw at the clamp plate. Leave
the other end of the shield unconnected or ground it indirectly via a few
nanofarads high-frequency capacitor eg, 3.3 nF / 630 V. The shield can also be
grounded directly at both ends if they are in the same ground line with no
significant voltage drop between the end points.Tighten the screws to secure the
connection.
Note: Keep any signal wire pairs twisted as close to the terminals as possible.
Twisting the wire with its return wire reduces disturbances caused by inductive
coupling.
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