Fig.5-28
Fig.5-29
Fig.5-30
Do not connect the power supply to the
communication terminal block. Otherwise,
the whole system may fail.
You must first connect the earth line (note
that you should use only the yellow-green
wire to connect to earth, and you must turn off
the power supply when you are connecting
the earth line) before you connect the power
cord. Before you install the screws, you must
first comb through the path along the wiring
to prevent any part of the wiring from
becoming exceptionally loose or tight
because the lengths of the power cord and
earth line are not consistent.
The wire diameter must comply with the
specified specification, and make sure the
terminal is screwed tight. At the same time,
do not subject the terminal to any external
force.
Do tighten the terminal with an appropriate
screwdriver. Screwdrivers that are too small
may damage the terminal head, and cannot
tighten it.
Excessive tightening of the terminal may
cause the screw thread to deform and slip,
making it impossible to connect the
components securely.
Only use a ring terminal to connect the power
cord. Non-standard cable connection will
lead to poor contact which may in turn cause
exceptional heating and burning. The figure
below demonstrates both the correct and
wrong connections.
NOTE
5.10.5.2 Power cord connections
Power supply
L1
L2
L3
N
L1 L2 L3
N
L1
L1
L2 L3
N
L2 L3
N
M8
Screw specification
Tightening torque, N.m
The size of the screws (power supply terminal
specifications) and recommended torque are as follows:
Steps to fix the power cord:
1. First, peel part of the skin of the outermost insulating
layer (refer to the third point below for the specific
length). Connect the power cable to the terminal, and
install the screws.
2. Position the wire clip. Be careful not to reverse the first
step, or it will be difficult to install the screws.
3. The wire clip has been fixed at a position on the sheet
metal near the terminal of the electric control box. Put the
power cable in the corresponding slot between the base
and upper cover. Select the appropriate slot based on
the specific diameter of the cable. When the
cross-sectional area of the power cable is less than 10
mm
2
, place the entire power cord inside the slot. At this
time, make sure both the length of the peel and the
length of the terminal are less than 70 mm, as shown
below.
When the cross sectional area of the power cable
exceeds 10 mm
2
, place the power cables separately in
the slot. When the skin is peeled, make sure the sum of
the length of the peel and the length of the terminal is
between 100 mm and 200 mm, as shown below.
5.5~7.0
Then, use 3 pieces of M4 * 30 mm screws to secure the
upper cover. At the same time, be careful not to screw it
too tight. If you use excessive force to twist to the end,
you may destroy the protection layer of the power cable.
29
