Chemglass AF-0304 - Manual (Page 14)

4.2. Setting the Control Points
4.3. Relay Output Connector Wiring
Contact Rating:
—3 amps, 120 VAC, resistive
—1.5 amp, 230 VAC, resistive
—1.5 amp, 28 VDC, inductive
Gently pull the connectors and they will detach from
their sockets for wiring. Plug back in when connections
are made. The “Low” set point relay is on the right side
when looking at the instrument from the rear.
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To set the control points, press in either the Low or High
“Push To Display” push-button on the front panel. This will
display that set point on the digital meter. Adjust the
multi-turn pot that corresponds to that set point until the
desired pressure for the control action is read on the
meter. The set point adjustment pots are located on the
front panel on either side of the LEDs. Release the “Push
To Display” push-button and the instrument will again
read pressure.
If the meter saturates and reads 1 xxx with the right-most
digits (xxx) blanked out, the control pressure setting is still
correctly displayed when either of the push-buttons are
depressed.
The LED’s show control action in the following manner:
—Relay energized, LED is ON ; de-energized, LED is
OFF
—Relays are de-energized when pressure is above the
set-point (on atmospheric pressure side of set point.)
—Atmospheric pressure = de-energized = loss of power
—“NORMAL” = de-energized relay
Relay Connectors On Rear Of Controller
“High Relay “Low Relay