This application illustrates the use of using the transistor output as a third relay.

Two connection diagrams are provided;

• The 24V relay version will work provided the power supply is between 8 and 45Vdc and the relay coil voltage is the same as the supply voltage. The maximum current draw allowed for the relay coil is 150mA.

• The 12V relay version will work on relays that draw up to 50mA(240 ohms).
  
  The auxilary voltage output must also be set to 12V.
  
  

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UAP1062a.usc

The upper trip and lower trip on extra relay have no time delay function.
Upper trip is set in con_c and the lower trip point is set in con_d.

UAP1062b.usc
UPA1062b.pdf

This application has full direct acting relay capabilities with adjustable upper trip, lower trip, on delay and off delay.

• The application operates on channel 1 by default, however this is easily changed as relay 3 operates on the value in the stack when line 'Goto Relay3'
• The equation update timer is set on 0.2 seconds, if this must be changed then Var00 ('1/Timer) must also be changed in the power on branch from the default caculated value of 5 (1/0.2) for correct on and off delay timing.