Yaskawa Z1000 AC Drive HVAC - Manual (Page 221)

If digital inputs A4, A5, or A7 or digital outputs
A4 or A5 are programmed, then all must be
programmed
Correct the parameter settings.
Digital inputs A4, A5, or A7 and digital outputs A4
or A5 are programmed and one of the following
conditions is true:
• H1-0 = 0 (3-Wire Sequence)
• L5-01 > 0 and S4-01 = 1 (Auto Transfer of Fault)
• H1-≤ A6 and H2- = A6
• H1- = A6 and H2-≤ A6
Digital Operator Display Error Name
oPE28 oPE28
Sequence Timer Error
One or more of the sequence timers is not set in the correct order.
Cause Possible Solutions
One of the following contradictory settings is true:
• S2-01 > S2-02
• S2-06 > S2-07
• S2-11 > S2-12
• S2-16 > S2-17
Correct the parameter settings.
5.6 Programming Errors
YASKAWA ELECTRIC TOEP YAIZ1U 03A YASKAWA AC Drive – Z1000 User Manual 221
5
Troubleshooting