Appendix A

Zelio™ Smart Relay Ladder Logic

The Zelio Smart Relay controls the power converter’s output contactor and the bypass contactor when Bypass (Mod Y10) is selected. Zelio Smart Relay Programcontains a diagram of the default Zelio Smart Relay program. See Zelio Smart Relay Ladder Logic Timers for a timing chart, Zelio Smart Relay Discrete Inputs for the discrete inputs, and Zelio Smart Relay Discrete Outputs for the discrete outputs.

Custom requests may result in a program that differs from the one illustrated in Zelio Smart Relay Program. If you have requested custom programming, review the drawings supplied with the process drive.

Zelio Smart Relay Ladder Logic Timers

Timer	Description	Function	Time (s)
T1	Power on delay	A: Active, control held down	6
T2	Open delay	C: Off delay	2
T3	AFC run delay	A: Active, control held down	5
T4	AFC contactor time delay	A: Active, control held down	3
T5	Bypass contactor time delay	A: Active, control held down	3
T6	Drive trip signal delay	A: Active, control held down	2
T7	Start with Line contactor	B: On pulse one shot	6

Zelio Smart Relay Discrete Inputs

Physical Inputs	Function	Comment
I1	Discrete input	HOA in hand mode
I2	Discrete input	HOA in auto mode
I3	Discrete input	Auto mode input
I4	Discrete input	Drive R1 (trip)
I5	Discrete input	Drive R2 (run)
I6	Discrete input	AFC/off/Bypass in AFC
I7	Discrete input	AFC/off/Bypass in Bypass
I8	Discrete input	Test/Normal mode switch
I9	Discrete input	Overload relay trip state

Zelio Smart Relay Discrete Outputs

Physical Outputs	Function	Comment
Q1	Discrete output	AFC contactor
Q2	Discrete output	Bypass contactor
Q4	Discrete output	AFC run command
Q6	Discrete output	Start push button seal (Mod B11)