Yaskawa AC Drive Z1000 AC Drive HVAC Fan - Manual (Page 148)

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
Output Frequency
Drive Fault
Bypass Run
L2-03
L2-03
Drive
Fault
Occurs
Drive
Fault
Cleared
Speed
Search
Occurs
Figure 1.80 Transfer on Fault
Energy Savings Mode
When the BP Energy Save Bypass Trigger Level (S4-02) is greater than 0, the Energy Savings Mode is enabled. If the drive
is running at a speed, as determined by SFS output equal to or greater than Maximum Output Frequency minus BP Energy
Save Bypass Trigger Level (E1-04 - S4-02) for the time specified in BP Energy Save Bypass Timer (S4-03), the drive output
frequency ramps to Maximum Output Frequency plus BP Energy Save Bypass Speed Increase (E1-04 + S4-04).
When the SFS output frequency is equal to Maximum Output Frequency plus BP Energy Save Bypass Speed Increase (E1-04
+ S4-04), the drive will perform an immediate transfer to bypass. Refer to Immediate Transfer to Bypass on page 144 for
details.
The drive will continue to run on line voltage until the frequency command drops below E1-04 - S4-02 (Maximum Output
Frequency minus BP Energy Save Bypass Trigger Level). When this occurs, the drive performs the switch. Refer to Transfer
to Drive Operation on page 144 for details.
The BP BAS Interlock Open message will display when the drive is waiting for the BAS feedback before issuing an internal
Run command or closing the BP Bypass Relay Contact.
1.11 S: Special Parameters
148 YASKAWA ELECTRIC SIEP YAIZ1U 03A YASKAWA AC Drive – Z1000 Programming Manual