Lenze 712 E.3B - Handbuch (Seite 52)

Electrical installation
Important notes
Shielding
5

52 EDB712 DE/EN 2.1
5.1.3 Shielding
ƒ Shield all wires to and from the drive controller.
ƒ Connect the shield near to the ends of the wires to the central earth wire
connection.
5.1.4 Prevent earth fault
ƒ Prior to commissioning, ensure there are no connection cables with earth
faults.
5.1.5 Mains potential

Danger!
Dangerous electrical voltage
ƒ All device terminals carry dangerous mains potential!
Protective measures
All control signals must be safely electrically isolated outside the
drive controller.
Prevent direct contact with the live parts using a protective cover as
double basic insulation.
5.1.6 Setpoint potentiometer

Danger!
Dangerous electrical voltage
If you use the setpoint potentiometer supplied, earth the
mechanical screw fastening, isolate the electrical connections or
cover the connections.
ƒ On use with a master voltage, remove the setpoint potentiometer and
connect the master voltage to terminal 7 (+) and terminal 8 (-). The
master voltage must be floating and not be referenced to the mains. If
several devices are to be operated on one master voltage, use electrical
isolation.
5.1.7 Switching spike reduction
ƒ To limit switching spikes that may occur on the operation of a reversing
contactor circuit to initiate reversing of the field, you must connect a zinc
oxide varistor (S20K510, art. no. 307 717) between each of the device
output terminals U-W, V-W and W-U.