User manual

Chapter 2 Installation and Wiring
32
If the inverter drives an inductive load (such as relay or contactor), then a surge
suppressing circuit should be added, such as RC snub circuit, lightning varistor or a
flywheel diode (used in the DC electric-magnetic circuit and pay attention to the polarity
during installation).Snubbing components should be as close to the coils of relay or
contactor as possible.
 Notes:
．
1 Don’t short circuit terminals 24V and COM, otherwise the control board may be
damaged.
．
2 Please use multi-core shielded cable or multi-stranded cable (above 1 mm) to
connect the control terminals.
．
3 When using a shielded cable, the shielded lay’s end that is nearer to the inverter
should be connected to PE.
．
4 The control cables should be as far away(at least 30 cm) from the main circuit and
high-voltage cables as possible (including power supply cables, motor cables, relay
cables and cables of contactor).The cables should be vertical to each other to reduce the
disturbance to minimum.
●Keyboard Interface
Keyboard Interface of CN3 on the control board uses standard 8PIN interface, which is
shown in Figure 2-31. Users can order the extended keyboard cable or make it by
themselves according to actual need. Be sure that the extension cable of the keyboard is
no longer than 15 meters, otherwise it wouldn’t work properly. (Remove the original
keyboard of models of S2R4GB～3004GB, or the exterior can not work properly.)
Fig 2-31 Keyboard Interface CN2 on control
board
Number
Corresponding
Color
1 White/Orange
2 Orange
3 White/Green
4 Blue
5 White/Blue
6 Green
7 White/Brown
8 Brown
Table 2-9 T568B standard connection