Yaskawa AC Drive Z1000 AC Drive Bypass for HVAC - Manual (Page 14)

2. Set H3-10 to “1F - HAND Mode” when using Terminal A2 for HAND Mode frequency reference.
n Z1-50: Bypass Unbalanced Current Detection Level
Sets the current unbalance level between phases as a percentage of parameter E2-01 when operating in Bypass Mode. This
function is used in conjunction with parameter Z1-51 to detect input or output phase loss during bypass operation.
The unbalance level is determined by measuring the RMS current in each of the output phases. The amount of current unbalance
between the phases is calculated using the following formula:
Unbalance Level = (I
(max)
- I
(min)
) / I
(max)
× 100%
When the unbalance level exceeds the Z1-50 setting for longer than the time set to Z1-51, an “FB15 – Input Phase Loss” fault
is triggered and the drive will coast to stop.
This parameter rarely needs to be changed.
Note: Parameter available in bypass controller software versions VST800298 and later.
No.
Addr. Hex
Name Setting Range Default
Z1-50
(85F7)
Bypass Unbalanced Current Detection Level 5.0 to 50.0% 25.0%
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.
Addr. Hex
Name Setting Range Default
Z1-51
(85F8)
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.
Addr. Hex
Name Setting Range Default
Z1-52
(85F9)
Bypass Phase Rotation 0 to 2 1
Setting 0: Disabled
Setting 1: Alarm
Setting 2: Fault
i.2 New Parameters and New Monitor
14 YASKAWA TOEP YAISUP 06A YASKAWA AC Drive – Z1000 Bypass Manual Supplement