Yaskawa AC Drive Z1000 AC Drive HVAC Fan - Manual (Page 149)

Fwd Run
Drive Enable-Customer
Safeties
Override (Smoke Purge)
Drive/Bypass Select
BP Drive Relay Contact
Output
BAS Interlock
BP Bypass Relay Contact
Output
BP BAS Interlock Contact
Output
SFS Output Frequency
L2-03
S4-03
BP Energy Save
Bypass Timer
<1>
<2>
<1> E1-04 minus S4-02 (BP Energy Save Bypass Trigger Level)
<2> E1-04 plus S4-04 (BP Energy Save Bypass Speed Increase)
Frequency Commanded to less than
E1-04 minus S4-02 (BP Energy Save
Bypass Trigger Level)
Speed
Search
Occurs
L2-03
Bypass Run
Figure 1.81 Energy Savings Mode
n S4-01: BP Auto Transfer on Fault Enable
Enables Auto-Transfer when a fault occurs.
No. Name Setting Range Default
S4-01 BP Auto Transfer on Fault Enable 0 or 1 0
Setting 0: No Transfer after Fault
Setting 1: Transfer to Bypass after Fault
n S4-02: BP Energy Save Bypass Trigger Level
Delta used to determine when to switch into Energy Save Bypass. This allows for lower frequency output values to also trigger
Energy Save Bypass functionality. A transfer to bypass occurs after the drive reaches the programmed output frequency (E1-04
to S4-02) for the time specified in the BP Energy Save Bypass Timer (S4-03). Additionally, if frequency input is set below
E1-04 to S4-02, the drive exits Energy Save Bypass. Setting S4-02 to 0 disables Energy Save Bypass functionality.
1.11 S: Special Parameters
YASKAWA ELECTRIC SIEP YAIZ1U 03A YASKAWA AC Drive – Z1000 Programming Manual 149
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Parameter Details