3.2.2
Exhaust pressure-switches
Both normally-open and normally-closed outputs are available from the pressure-switches. To
ensure that the exhaust pressure is monitored correctly, you must connect the signal outputs
from the exhaust pressure-switches so that :
•
the warning signal gives an indication that the pressure of the exhaust-purge nitrogen
supply is too high
•
the over-pressure signal switches off the pump. (Note that, if you have installed your Gas
Module correctly, this will also switch off the nitrogen supply to the Gas Module.)
3.3
Configure the Q Series 3 Exhaust Pressure Module (if necessary)
CAUTION
If you reconfigure the Exhaust Pressure Module, ensure that all the electrical connections
are secure before you use the Exhaust Pressure Module.
The Q Series 3 Exhaust Pressure Module as supplied is configured for use with control systems
which require individual common wires to each pressure-switch. This configuration is shown in
Figure 3, detail A. Text on the back panel of the Q Series 3 Exhaust Pressure Module identifies
this configuration (see Figure 4, detail A), which is suitable for use with Q Controllers with Item
Numbers A381-xx-xxx.
If you want to use the Q Series 3 Exhaust Pressure Module with a Q Controller with an Item
Number of A380-xx-xxx, you must reconfigure the Exhaust Pressure Module so that the
pressure-switches have a shared common wire; use the following procedure:
1.
Remove the cover from the Q Series 3 Exhaust Pressure Module.
2.
Refer to Figure 3. Unplug the link lead (4) from the parking terminal (3) and unplug the male
connector from the male/female connector on the lead.
3.
Unplug wire 8 from the common terminal on the warning pressure-switch (5). Plug wire 8
onto the parking terminal (3).
4.
Unplug wire 7 from the common terminal on the over-pressure pressure-switch (6).
5.
Plug the male connector on the link lead onto the common terminal on the over-pressure
pressure-switch (6).
6.
Plug the male/female connector on the link lead onto the common terminal on the warning
pressure-switch (5).
7.
Plug wire 7 (removed from the pressure-switch in Step 4 above) onto the male/female
connector on the link lead.
8.
Peel off one of the self-adhesive labels from the inside of the cover of the Q Series 3 Exhaust
Pressure Module. Place the label over the configuration text on the rear panel of the Q Series
3 Exhaust Pressure Module: refer to Figure 4, detail B.
9.
Refit the cover on the Q Series 3 Exhaust Pressure Module.
Q Series 3 Exhaust Pressure Module
7