Lenze EDB9300UES - Manual (Page 75)

Transport, Installation and Connection
70 BA8230
Cooling is fan-assisted. An adequate clearance above the unit (see section 2.8) is to
be provided to prevent heat build-up. Cooling air is fed in from below, where adequate
clearances are also to be provided (see section 2.8).
Internal air circulation must generally be prevented. Unsatisfactory ducting and air
flow will result in overheating in the switchgear cubicle.
3.5 Connection and wiring We recommend that 3-phase cables with the cross-sections stated in Table 23 below
should be used for the power connections (the motor and mains supply). For reasons
of electromagnetic compatibility the motor connection cable used should be a 3-phase
cable with a concentric protective conductor. This protective conductor (screen
sleeve) in the motor cable is to be earthed at both ends. A connection bracket (option)
is available for connecting several cables to a power connection strap.
The screw connections are to be secured to prevent loosening through vibration and
temperature fluctuation, using a suitable spring component.
The bolt sizes and tightening torque levels are given in Table 23.
Power cables must be secured to suitable cable brackets for strain relief purposes.
The PE connection on the unit must be connected to a good earth.
Mains supply cables and motor cables are to be laid separately according to the EMC
connection instructions.
When connecting the motor to the 8230 frequency inverter it is important to ensure
that no other power circuit (e.g. reactive power compensation) is connected to the
motor connection. This is particularly important when upgrading an existing system.
The motor star point may not be earthed.
Control and signal cables for the control electronics are to be laid and connected in
accordance with the EMC connection instructions.
Connecting signal leads
Electronic control circuits are considered low power circuits (< 2 A) according to DIN
EN 60204 Part 1 (VDE 0113 Part 1, 6). In approximation to this standard we
recommend the following cross-sections for terminal strip wiring on fixed indoor
systems for reasons of the mechanical strength and interference resistance:
•
Single core, multi-wire (stranded) cables at least 1 mm²,
in switchgear cubicles at least 0.5 mm²
•
Multi-wire screened cable at least 0.75 mm²
in switchgear cubicles at least 0.5 mm²
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