Vaderstad RAPID RD 300 F, Instructions Manual

Page: 97 / 114

RD 300-450 F
Ver.1.3 07/06/01 97
6.3 Notes on troubleshooting
Hydraulic solenoid valves
A solenoid has a coil which acts as an electromagnet when a current is passed through the sole-
noid. It is easy to see if current is getting to the solenoid since the connector diode light comes on
and the coil becomes warm after a few minutes. The nut on the top of the solenoid also becomes
magnetic, test this with a small screwdriver or the blade of a knife. The nut has some permanent
magnetism, so test it with the current off and on. Current is getting to the bout marker solenoid
valves (B) when the relevant indicator lights up, to the Lift stop valve (C) when its switch is
down or when Low lift is activated at Low lift height and to the pre-emergence bout marker
valve (A) when the tramlining lights A (on the Control Box) come on.
NOTE!
The Control Box does not release the signals for bout or pre-emergence marking until the
drill is below Low lift height. (Input signal on pole 21).
Reed switch
Figure 6.3
The reed switch is a connection which responds to a magnetic field. It is made up of a glass tube
containing two metal tongues which move towards each other in a magnetic field (see Fig 6.3).
This can be tested using a magnet or a multimeter.
Figure 6.1 Figure 6.2
C
B
A