Aalborg PSV-D - Manual (Page 9)

6
The maximum output voltage supplied to the valve, can be set/changed in the
field. Changing this will allow for optimal use of the input reference signal to out-
put valve voltage based on the specific flow rate and operating pressure applied
to the valve.
With the power ON, use Table II and Figure e-1 to make the appropriate changes
as necessary. (Note: This procedure may not need to be performed. It is provided
as an added feature to further customize your system.) Move the jumper to either
position 1, 2, or 3, and use the adjacent potentiometer [P1] to make fine adjust-
ments to the desired output voltage.
Always make sure that only one jumper is ever applied at any given
time to either position 1, 2, or 3. Connecting two or more at the same
time may result in damage to the electronics, and improper control.
e.3 Set Point Reference Signal
The PSV-D solenoid valve driver in conjunction with the PSV solenoid valve allow
the user to set the flow to any desired flow rate within the range of the particular
model installed. The PSV solenoid valve is normally closed when no power is
applied.
The set point input responds to an analog 0 to 5 VDC or 4 to 20 mA reference sig-
nal. Use this reference signal via the PSV-D valve driver to set the flow rate of the
PSV solenoid valve.
e.4 TTL, Valve ON/OFF Control
It may, at times, be desirable to set the flow and maintain that setting while being
able to turn the flow control valve off and on again. This can be accomplished by
applying a (TTL compatible) high and low signal of +5 VDC and 0 VDC to pin 9
on the 9 pin "D" connector. The factory default configuration is set so that when 0
VDC (LOW) signal is applied, the solenoid valve is not powered and therefore will
remain normally closed. Conversely, a +5 VDC (HIGH) signal applied will allow the
solenoid valve to remain active. The solenoid valve will remain active when the
VALVE OFF pin remains "floating". (To reverse this configuration, see section
b.1.3)
Toggling the HIGH/LOW signal on and off will allow for activating and deactivating
the solenoid valve. Remember: If the TTL signal line is connected, the valve will
only function if the appropriate logic input is applied.
ƽ