Additional signals such as "Output Bias" and "Dither" are also applied to the input of the current output
stage. The output bias is typically understood as an electronic null adjust and is capable of biasing the
output from ± 12% of full scale output. Dither is an optional adjustment that can be used to reduce the
effects of sitting or stiction. This signal is basically a low amplitude fixed frequency AC signal that is
superimposed onto the output signal. This allows the valve spool to remain active while at null. Front
panel adjustment "Dither" will affect the amplitude of this signal while potentiometer P12 will adjust the
frequency (factory set at 200 hz).
The amplifier is factory set for ± 200 ma output, however, if desired the maximum output capability can
be reduced via on board jumper "JP1." The amplifier provides three jumper positions labeled (A), (B), and
(C). When jumper JP1 is in the (C) position, the amplifier can output ± 200 ma, ± 100 ma when in the (B)
position, or ± 50 ma when in the (A) position. This feature may be beneficial where greater control of the
input span is desired. Output current can be monitored at front panel test point TP2. The output is in
volts where 1 mv equals 1 ma of output current.
Installation Guide
Servo Amplifier
Servo Amplifier Discussed
6 |
©
Danfoss | August 2023
BC459665217198en-000101