Yaskawa AC Drive Z1000 AC Drive HVAC Fan - Manual (Page 294)

Continue at Preset Speed
In this mode, Cable Loss Timeout (AO 21) is set to the desired interval, Cable Loss Speed (AO 22) is set to the desired preset
speed and H5-04 is set to “4”. If the time between messages exceeds the timeout interval, the drive speed command (AO 1)
is set to the Cable Loss Speed (AO 22) and the drive continues running at this new speed. Communication Fault Enable (BO
11) must be set to ‘On’.
Stop with Fault (EF0)
Communication Fault Enable (BO 11) must be set to ‘On’. In this mode, Cable Loss Timeout (AO 21) is set to the desired
interval and parameter H5-04 is set to a value of 0,1 or 2. If the time between messages exceeds the timeout interval, the drive
will declare an EF0 fault and the drive speed command (AO 1) will be set to 0. The stopping method is determined by the
setting of H5-04.
• H5-04 = 0 selects Ramp to Stop. The deceleration time or the slope of the ramp is determined by the setting of drive parameter
C1-02
• H5-04 = 1 selects Coast to Stop. The drive does not attempt to control the rate of deceleration.
• H5-04 = 2 selects Emergency or Fast Stop. The deceleration time is determined by the setting of drive parameter C1-09.
Note: The behavior of the drive at cable loss is controlled by parameter H5-04. This drive parameter works with the points as described in the
table above to determine how the drive will respond to a cable loss. If the cable loss fault is disabled, the drive will continue in its last state,
if running the drive will continue to run at the last commanded frequency.
D.5 Drive Operations by N2
294 YASKAWA ELECTRIC SIEP YAIZ1U 03A YASKAWA AC Drive – Z1000 Programming Manual