n
Z1-51: Bypass Unbalance Trip Time Detection Level
Sets the trip time for an unbalance condition when operating in Bypass Mode. This function is used in conjunction with
parameter Z1-50 to detect input or output phase loss during bypass operation.
Note:
1.
Parameter available in bypass controller software versions VST800298 and later.
2.
Setting this parameter to 0.0 will disable unbalance (bypass phase loss) protection.
No.
Name
Setting Range
Default
Z1-51
Bypass Unbalance Trip Time Detection Level
0.0 to 30.0 s
5.0 s
n
Z1-52: Bypass Phase Rotation
Input phase rotation is ignored when operating in Drive Mode. Input phase rotation determines motor direction when operating
in Bypass Mode.
If input phase rotation is reversed and this parameter is set to 1, an “AL16 – Inp Phase Rotation” alarm will be displayed when
operation starts in Bypass Mode and operation continues.
If input phase rotation is reversed and this parameter is set to 2, an “FB16 – Inp Phase Rotation” fault will be displayed when
operation starts in Bypass Mode and the drive will coast to stop.
Controls the behavior of the bypass phase rotation detection when operating in Bypass Mode.
Note:
Parameter available in bypass controller software versions VST800298 and later.
No.
Name
Setting Range
Default
Z1-52
Bypass Phase Rotation
0 to 2
<1> Default is 1 in bypass controller software versions VST800299 and earlier.
Setting 0: Disabled
Setting 1: Alarm
Setting 2: Fault
n
Z1-53: Load Verification Fault Select
Enables and disables verification that the motor is running when commanded to run.
When this function is enabled and the bypass detects a loss of output current, such as an open external motor disconnect, or a
zero frequency reference command for longer than 10 seconds, the bypass will display a “Load Lost” fault, coast to stop, and
any digital output programmed to “Damper Act Out” (Z2-2
o
= 20) will open.
The "Load Lost" fault is disabled during smoke purge operation.
Note:
Parameter available in bypass controller software versions VST800400 and later.
No.
Name
Setting Range
Default
Z1-53
Load Verification Fault Select
0 to 1
0
5.15 Z: Bypass Parameters
YASKAWA ELECTRIC SIEP YAIZ1B 01E YASKAWA AC Drive – Z1000 Bypass Technical Manual
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5
Programming
