Shielding; Prevent Earth Fault; Mains Potential; Setpoint Potentiometer - Lenze 712 Operating Instructions Manual

5 Electrical installation
Important notes

Shielding

5.1.3 Shielding
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
ƒ
connection.
5.1.4

Prevent earth fault

Prior to commissioning, ensure there are no connection cables with earth
ƒ
faults.
5.1.5

Mains potential


Danger!
Dangerous electrical voltage
ƒ
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.
On use with a master voltage, remove the setpoint potentiometer and
ƒ
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

To limit switching spikes that may occur on the operation of a reversing
ƒ
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.
52
All device terminals carry dangerous mains potential!

EDB712 DE/EN 2.1