Center tap
A center tap (spring return to center option) is a standard JS120 feature, where 50% of the supply voltage
can be supplied to force the sensor voltage to this known reference. When the center tap is not
connected there will be a center dead band (where the voltage output does not change on initial
deflection).
Padding resistors
The JS120 potentiometer track has resistors placed in series with the main resistive element. These
resistors are used to reduce the outputs at full mechanical deflection. This is a safety feature that the
machine control system can use to determine a broken wire or short circuit to full voltage or ground. The
degree to which the output is reduced can be chosen from the Code B table in
page 5.
Position switches
Position switches are a standard JS120 feature. The normally open switches close at the angles specified
in the table below indicating forward and reverse travel of the lever. These switches are connected
independently of the proportional potentiometric elements and can be terminated by the customer to
provide center on/off data to the control system.
Specifications
Switch operating angle
5˚ either side of center (± 1˚ tolerance)
Maximum supply voltage—maximum Vs
< 35 Vdc
Minimum load resistance
10 kΩ
Maximum load current
2 mA resistive
Typical contact resistance
150 Ω
Technical Information
JS120 Single Axis Fingertip Joystick
Product configuration model code
6 |
©
Danfoss | December 2016
520L0877 | BC00000075en-US0303
