INSTALLATION
INITIAL SWITCH SETTINGS
3 - 6
I-E96-315B
®
Switch S4 - Dither Oscillator Current Amplitude
Switch S4 is a two position switch that sets the current ampli-
tude of the dither circuit. Set the dither oscillator current
amplitude to the value the manufacturer of the servo valve rec-
ommends. This switch also allows the user to disable the
dither oscillator if required. To set the dither oscillator ampli-
tude:
1. Refer to the servo valve specifications for the recommended
dither oscillator current amplitude.
2. Refer to Table
for switch settings and set S4
accordingly.
Switch S5 - LVDT Primary Voltage Amplitude
Switch S5 is a two position switch that sets the linear variable
differential transformer primary excitation voltage. Set the
amplitude of the LVDT primary excitation voltage to the value
the manufacturer recommends. To set the LVDT excitation
voltage:
1. Refer to the LVDT specifications for the recommended
LVDT primary excitation voltage.
2. Refer to Table
for switch settings and set S5 so that the
excitation voltage is within the manufacturer's specifications.
Table 3-4. S4 Dither Oscillator Amplitude
Switch Position
Amplitude
User Setting
1
2
Closed
Open
2.4 mA
Open
Closed
1.2 mA
Open
Open
Dither Disabled
NOTE: Do not leave both switches closed; the circuit will not function
properly.
1 = Open (off), 0 = Closed (on)
Table 3-5. S5 LVDT Excitation Voltage
Switch Position
Voltage
User Setting
1
2
Closed
Open
14.0 Vp-p (typical)
Open
Closed
8.0 Vp-p (typical)
Closed
Closed
6.0 Vp-p (typical)
NOTE: Do not leave both positions in the open position; the switch will not
function properly.
1 = Open (off), 0 = Closed (on)
