-5-
11
. Loop powered 4-20mA transmitter. This amplifier is
equipped with an on-board loop powered transmit-
ter that can transmit the true actuator output shaft
position in 4-20mA units. The transmitter requires
an external 12-36 Vdc regulated power supply, load
resistor, and indicator; available from Jordan
Controls at extra charge. After wiring is completed
per the wiring diagram shipped with the actuator,
adjustment is as follows: Apply a command signal to
the actuator at the minimum value. For 4-20mA
systems this would normally be 4 mA. After the
actuator moves to position and stops, adjust the pot
labeled 4mA until the indicator displays 4mA. Then
apply a 20mA command signal and wait for the
actuator to move and stop. Then adjust the pot
labeled 20mA until the indicator displays 20mA.
Some interaction of the above pot settings will
require repeating this procedure until proper
accuracy is achieved. Adjustment is complete.
12
. Loss of 4-20mA signal. In the event of a loss of
current command signal (LOS), the servo ampli-
fier can be programmed to either lock in place or
go to a preset position. Referring to the DIP
SWITCH TABLE, select one option and position the
DIP SWITCH accordingly. If move to preset
option is selected, the preset position must be
adjusted now.
With the servo amplifier in normal operation,
remove the positive command signal wire from the
amplifier. The LED labled LOS lights, indicating a
loss of command signal, and the actuator will move
to the preset LOS pot setting. Slowly adjust the
LOS pot until the actuator shaft is in the position
desired when loss of command signal occurs.
Reconnect the command signal. Adjustment is
complete.
Note
: With Dip Switch 4 in its manual position,
momentary switches S1, S2 and S3 can be used to
manually stroke the actuator. Depressing S1 will cause
the actuator to move in one direction, and depressing
S2 will cause the actuator to move in the opposite
direction. The end of travel limit switches in the
actuator will protect against overtravel in either
direction.
With Dip Switch 4 in its manual or automatic
position, depressing S3 will immediately stop actuator
travel.
Switch
Position
Function
On
4-20mA Command Signal
Off
Not Using 4-20mA Command
On
Voltage Command Signal
Off
Current Command Signal
On
Loss of Signal - Park in Place
Off
Loss of Signal - Go to Set Point
On
Auto Operation
Off
Manual Operation
On
0-5 Vdc Command Signal
Off
0-10 Vdc Command Signal
On
4-20mA Remote Feedback
Off
Pot Feedback
On
Not Used
Off
Not Used
On
Not Used
Off
Not Used
AD-7830 DIP SWITCH TABLE
1
2
3
8
4
5
6
7
