Magnescale Digiruler PL20C series Instruction Manual page 26

Noise Prevention
When installing the scale unit, observe the following to prevent noise interference from other equipment.
• Apply preventive measures to relays, solenoids and motors connected to the scale unit against noise interference.
DC relay
Diode
AC relay, DC relay
Varistor
• Take preventive steps when the noises from other equipment may disturb the power supply line to the scale unit.
IV
(E)
Counter unit
AC relay, solenoid, motor
Spark killer
3-phase motor
Spark killer
AC input
Noise filter
3-phase
PL20C