FVR-C11S-EN
2-8
2 Installation and Connection
2
*Note the following when wiring:
1) Surge absorber connection
When the exciting coil of the magnetic con-
tactor or relay in the control circuit or inverter
peripheral circuit is opened or closed, a surge
voltage (noise) is generated with a sudden
current change. Due to this surge voltage,
the inverter control circuit or peripheral equip-
ment may malfunction. If so, directly connect
a surge absorber to both ends of the coil.
(See Figure 2-3-4).
Figure 2-3-4 Surge absorber connection diagram
2) Control circuit wiring
1. Wires connected to control circuit termi-
nals must be 0.5mm
2
shielded wire or
twisted vinyl wire. Remove the sheath as
shown in Figure 2-3-5 and then connect it.
Figure 2-3-5 End treatment
2. Keep the wiring of the main circuit, exter-
nal relay sequence circuit and control cir-
cuit as far away from each other as
possible. If they must be adjacent, cross
them at right angles.
3. Use a twisted-pair shielded wire for long
wiring distances.
3) Shielding sheath connection
Connect one end of the shielding sheath of a
shielded or twisted-pair shielded wire to the
ground terminal as shown in Figure 2-3-6. Do
not connect the other end.
Figure 2-3-6 Connection of sheath of shielded wire
+
-
Ry
D
MC
SK
SK: Surge absorber D: Diode
AC relay
DC relay
6
±
1mm
P24/CM
13
12
11
FWD
Contact
Shield
Shield
Frequency
setting POT
To ground terminal
To ground terminal
CAUTION
Noise is generated from the inverter,
motor, and wiring. Take care that this
noise does not cause malfunctions in
peripheral sensors and equipment.
Otherwise accidents could occur.
