ECO REFERENCE MANUAL
10-2
POWER AND MOTOR CONNECTIONS
- MIDIMASTER Eco RANGE
1. Gain access to power and motor terminals
by removing the front cover from the inverter
(lower-front cover only, for frame size 7).
2. Make sure that the power source supplies
the correct voltage and has the necessary
current supply capacity. Make sure that the
appropriate circuit-breaker (or fuses) with the
specified current rating are connected
between the power supply and inverter
(Refer to Table of recommended fuses and
ratings on page 10-7).
3. Feed the cables through the correct glands
in the base of the inverter. Secure the cable
glands to the inverter and connect the leads
to the power and motor terminals.
4. Connect the power input leads to the power
terminals L1, L2, L3 (3 phase) and earth (PE)
using a 4-core cable and lugs to suit the cable
size.
5. Use a 4-core cable and suitable lugs to
connect the motor leads to the motor
terminals U, V, W and earth (PE).
6. Tighten all the power and motor terminals:
Frame size 4 and 5: Tighten up each of the
power and motor terminal screws to 1.1 Nm.
Frame size 6: tighten up each of the power
and motor terminal Allen-screws to 3.0 Nm.
Frame size 7: Tighten up each of the M12
power and motor terminal nuts to 30 Nm.
Make sure that all the leads are
connected correctly and the
equipment is properly earthed.
The total length of the motor cable(s)
should generally not exceed 100m. If
a screened motor cable is used or if
the cable channel is well grounded,
the maximum length should generally
not exceed 50m. Cable lengths
above 200m are possible by derating
the invertor’s output current or by
using additional output reactors
(chokes). Refer to table of maximum
recommended motor cable lengths-
Section 13 and output reactor
selection-Section 15.
7. Secure the front cover to the inverter when all
connections are complete and before
energising.
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