Nord Drivesystems B1091, Operating Manual With Installation Instructions

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Motors – Manual with installation instructions
38 B 1091 en-1221
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3.3.2 Terminal box cover seals
The terminal box cover gasket is captively mounted on the terminal box cover. Please only use an
original seal when replacing the seal.
If the terminal box is opened during installation, maintenance, repair, troubleshooting or overhaul, the
terminal box cover must be re-fitted after the work is complete. There must be no dirt on the surface of
the seal or the sealing surface of the terminal box frame.
The screws for the terminal box cover must be tightened with a torque according to the list below.
Tightening torques for terminal box cover screws
Thread diameter M4 M5 M6 M8
Tightening torque (Nm) 0.8 - 1.2 1.2 - 1.8 1.5 - 2.5 3.0 – 5.0
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3.3.3 Electrical Connection
The electrical connections of the terminal board are protected against twisting. The voltage supply to
the terminal board must be made by means of suitable ring terminals. The ring terminals are installed
between the two brass washers below the lock washer. The nuts must be tightened with a torque
according to the table below. The contact pressure is permanently maintained by means of the
specified torque and the lock washer. In addition, twisting of the ring terminals of the voltage supply is
prevented. The connection elements are corrosion-proof.
Tightening torques for terminal board connections
Thread diameter M4 M5 M6 M8
Tightening torque (Nm) 0,8 - 1,2 1,8 - 2,5 2,7 - 4,0 5,5 - 8,0
Exploded diagram of electrical connection
Brass nut
Lock washer
Brass washer
Brass nut
Ring terminal
Brass thread with collar
Mechanical protection against twisting
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3.3.4 Cable glands
Cable glands must be approved for explosion hazard areas of Zone 21 (protection class: at least IP66)
and be secured against self-loosening. Unused openings must be sealed with approved plugs
(protection class: at least IP66).
For Zone 22, cable glands according to EN 60079-0 and IEC 60079-0 must comply with at least one
protection class that is indicated on the name plate. Unused openings must be sealed with blind plugs
that comply with at least the motor protection class as well as with the requirements according to
Cable lug provided by
customer