16
conduct corresponding jumper on master control board according to signal type.
▲
Connecting week analog signal is easily affected by external disturbance. So wiring should be as short as possible.
The external control line should be set with isolating device or shielding line, and should be grounded.
▲
Input order signal line and frequency meter should be wired separately with shielding, and away from major loop
wiring.
▲
Control loop wiring should be over 0.75 mm
2
, and STP (shielded twisted pair) is recommended. The connecting part
of control loop terminals should be enameled with tin, or process metal joint with cold pressing.
▲
While connecting analog signal output devices, malfunction may occur because of interference from VFD, which can
be solved by fixing with capacitor or ferrite bead to the analog signal output device.
2.10 Dial Switch