2.5.5 PINS 10-12: Relay Contact Output
Pins 10 through 12 connect to an internal latching relay contact. This floating bi-stable contact is dedicated to an interlock function
because its state is true regardless of whether the Universal II is powered or not. It is by default assigned to indicating whether or
not the monitor/turret is stowed (parked). Because it is floating, it may be connected to either battery positive or negative for
driving loads such as pilot lights or external relays. Refer to Figure 2-6 for examples of connecting an external load. This contact is
not rated for dry circuits and so should have at least a 10 mA load minimum. It does not have arc suppression. Therefore, if driving
a relay coil, external suppression should be provided. A typical usage would be for a warning light to alert the driver the monitor/
turret is not properly stowed/parked. If this optional feature is not used, it is recommended these pin locations be fitted with
Deutsch pin
sealing plugs.
or
Figure 2-6 Relay Contact Output Wiring
2.5.6 PIN 13: Enable Input
Switch Input #1 (Pin 13) is dedicated to interlock functionality. NOTE: This switch input must be connected to battery common
or ground in order for the Universal II to function. This input is typically used for connecting a parking brake switch to this input
to prevent operation of the monitor/turret without first setting the parking brake. If interlock functionality is undesired, this pin
should be hard-wired to Battery common or ground.
2.5.7 PINS 14-21: Switch Inputs
Switch Inputs #2 to #9 (pins 14 to 21) are primarily intended for toggle switch inputs. Their function varies depending on
configuration. An Akron Brass Operator Station can be used or user can provide their own switch inputs. Please refer to the
Appendix for the particular version Universal II for their assigned function. The Universal II version is identified by a barcode label
on the outside of the enclosure between the J1 and the J2 connectors that includes the part number (6032XXXX) and revision level.
Each input recognizes three distinct states – open, connected to +Bat, and connected to –Bat. A typical toggle switch connection
is shown in Figure 2-7. Use of relay contacts could also be implemented if care is taken to insure there is never a case in which the
battery is shorted out. A form C contact is a good choice in which the common is tied to the switch input. High/Low Gallonage
control would be an example of where relay contacts could be used.
Figure 2-8 shows connection of an Akron Brass switch box. Note the hard-wired connection into Switch Input #1 to continuously
enable the monitor. Also note that pins 22 and 25 supply power to the operator station LED. See section 2.5.8 for more detail.
Figure 2-7 Switch Input Wiring
Unused switch input pins should be fitted with Deutsch pin sealing plugs. These are included in the connector kit if purchased from
Akron Brass.
NOTE:
If any of the switch inputs are still connected to b after power is removed from the Universal II (i.e. the switch inputs
are not powered directly from the U2 as shown), the control will not properly shut down due to leakage currents through the inputs.
Insure that b for the switch inputs is disconnected along with power to the Universal II.
14
Fig. 2-7
