Kärcher HD 20/15-4 Service Manual

Also see for HD 16/15-4: Manual

Kärcher HD 20/15-4 Service Manual Manual pdf 18 page image

18 English 5.906-494.0 Rev. 01 (04/11) The resistance to spray water is ensured by a sealon the shaft. Loosen the 4 fastening screws. Disconnect the cable connections. Remove the appliance switch. Assemble it back in the reverse sequence.1 Protective conductor connection2 Measuring coil3 DIP switch4 Measuring coil5 Fuse 1.0 AT6 Terminal strips7 Indicator lamp connectionThe electronics can only be replaced as one com-plete unit. Prior to the replacement, check the cableconnections, connected components and fuses.Connect power supply and control wires according tothe circuit plan.Position of the DIP switches:Display of the indicator lamp:Switch-off after 30 minutes of continuous opera-tion or continuous break: Indicator lamp is blinking green Machine switches off and locks up, if there is nosignal change from the pressure switch after an-other 30 minutes. A signal change will restart the time. DIP switch 4: OFF = without switch-off, ON = withswitch-off.Leak 1 blink red. Switch-off and locking of the machine after 10short starts (less than 2 seconds) due to a leak. DIP switch 3: OFF = without switch-off, ON = withswitch-off.Winding protection contact blinks red twice: Switch-off and locking of the machine, if the wind-ing protection contact opens.Over or under voltage, current asymmetry blinks red thrice: Switch-off and locking of the machine in case thesecondary voltage of the control transformer isless than 17 volts AC (under voltage). Switch-off and locking of the machine in case thesecondary voltage of the control transformer ismore than 37 volts AC (over voltage). Switch-off and locking of the machine in case of acurrent difference on the transformers of morethan 10 A for two seconds.Overcurrent Switch-off and locking of the machine in case of anover voltage of 42 A on one of the transformers.One-phase operation DIP switch 1: ON = one-phase appliance, OFF =three-phase appliance. In the one-phase appliance, only one transformeris used.5.5.3 Motor protection electronics5.5.4 Functional description of the motor protec-tion electronics:Switch Position Meaning1 OFF 1-phase appliance2 ON Trailing time 30 seconds3 ON Leak detection4 ON Switch off after 30 minutes ofcontinuous operation / pause.Blinking Colour Meaning-- Green Operation, voltage present, nofaultsDura-tionGreen 30 minutes of continuous opera-tion, continuous pause1x Red Leak in the system2x Red Winding protection contact wastriggered3x Red Over or under voltage, currentasymmetry4x Red Overcurrent