Yaskawa AC Drive Z1000 AC Drive Bypass for HVAC - Manual (Page 17)

No.
Addr. Hex
Name Setting Range Default
L2-01
(0485)
Momentary Power Loss Operation Selection 0 to 2 2
Setting 0: Disabled
If power is not restored within 15 ms, a Uv1 fault will result and the motor coasts to stop.
Setting 1: Recover within L2-02
When a momentary power loss occurs, the drive output will be shut off. If the power returns within the time set to parameter
L2-02, the drive will perform Speed Search and attempt to resume operation. If the power does not return within this time, it
will trigger a Uv1 fault.
Note: L2-02 value is dependent on drive model selection and is not accessible.
Setting 2: Recover as long as CPU Has Power
When a momentary power loss occurs, the drive output will be shut off. If the power returns and the drive control circuit has
power, the drive will attempt to perform Speed Search and resume the operation. This will not trigger a Uv1 fault.
Notes on Settings 1 and 2
“Uv” will flash on the operator while the drive is attempting to recover from a momentary power loss. A fault signal is not
output at this time.
n Z1-07: Speed Reference Select
Selects the frequency reference source 1.
Note: 1. Default is 1 in bypass controller software versions VST800298 and later. Default is 0 in bypass controller software versions VST800297
and earlier.
2. If a Run command is input to the drive, but the frequency reference entered is 0 or below the minimum frequency, the AUTO or HAND
indicator LED on the HOA keypad will light and the OFF indicator will flash.
No.
Addr. Hex
Name Setting Range Default
Z1-07
(85CC)
Speed Reference Select 0 to 3 1
Setting 0: HOA Keypad
Using this setting, the frequency reference can be input by:
• switching between the multi-speed references from d1-01 to d1-04.
• entering the frequency reference on the operator keypad.
Setting 1: Analog Input Terminals
Using this setting, an analog frequency reference can be entered as a voltage or current signal from terminals A1 or A2.
Voltage Input
Voltage input can be used at any of the two analog input terminals.
When using input terminals A1 and A2, make sure Jumper S1 is set for voltage input.
Setting 2: BACnet, MEMOBUS/Modbus, P1, or N2 Communications
This setting requires entering the frequency reference via the RS-485 serial communications port (control terminals TXRX+
and TXRX-).
Setting 3: Option Card
This setting requires entering the frequency reference via an option board plugged into connector CN5 on the bypass control
board. Consult the option card manual for instructions on integrating the drive with the communication system.
n Z1-37: Set Time
Changes the LCD display to time setting to set the Real Time Clock.
Note: Setting 2 is added in bypass controller software version VST800298. Setting 2 is not available in bypass controller software versions
VST800297 and earlier.
i.3 Modified Parameters
YASKAWA TOEP YAISUP 06A YASKAWA AC Drive – Z1000 Bypass Manual Supplement 17