YASKAWA HV600 Technical Reference page 732

10.5 Metasys N2 Communications
– Coast to Stop with EF0
– Emergency Stop with EF0
• Metasys N2 I/O
Three Metasys N2 outputs are used to select the desired behavior:
– AO 21 - Cable Loss Timeout
– AO 22 - Cable Loss Speed
– BO 11 - Communication Fault
Behavior
Decelerate to stop (stop time in C1-02) with EF0 fault
Coast to stop with EF0 fault
Emergency stop (stop time in C1-09) with EF0 fault
Continue at last speed
Continue at last speed with alarm
Continue at preset speed with alarm
Note:
1. Communication must first be established and then lost for these features to function as described. If a bypass is powered-up without a
cable connected or with the master controller offline, a communications timeout does not occur.
2. For modes that describe the bypass running after a communications timeout, a Run command must have been issued (BO 1 = "ON" or BO
2 = "ON") prior to loss of communications. For safety purposes, the bypass will not automatically restart from a stopped condition. If a
user requires the bypass to restart automatically, additional external wiring is required to accomplish this (consult factory).
Upon expiration of the communications timeout interval, the FAULT LED lights and remains lit until
communication is restored.
• Continue at Last Speed
In this mode, Cable Loss Timeout (AO 21) is set to 0, disabling the cable loss feature. The other two settings Cable
Loss Speed (AO 22) and Communication Fault Enable (BO 11) are ignored. If communication is lost, the bypass
simply maintains its last commanded state. The bypass will not display an alarm or fault to indicate it has lost
communication. This behavior can also be achieved by setting H5-04 = 3. The bypass will display an alarm and
continue running. For this specific condition, the Communication Fault Enable (BO 11) must be enabled and Cable
Loss Timeout (AO 21) should be set to a value other than 0.
• 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 = 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 = 0, 1, or 2. If the time between messages exceeds the timeout interval, the
bypass will declare a CE fault. 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 C1-02
– H5-04 = 1 selects Coast to Stop. The bypass does not attempt to control the rate of deceleration.
– H5-04 = 2 selects Emergency or Fast Stop. The deceleration time is determined by C1-09.
Note:
The behavior of the bypass at cable loss is controlled by H5-04. This parameter works with the points as described in the table above to
determine how the bypass will respond to a cable loss. If the cable loss fault is disabled, the bypass will continue in its last state, if running
the bypass will continue to run at the last commanded frequency.
◆
Communications Timing
To prevent overrun of the slave side, the master cannot send a message to the same drive for a selected length of time.
732
Table 10.13 Cable Loss Behavior Summary
H5-04
[Communication Error Stop
Method]
0 [Ramp to Stop]
1 [Coast to Stop]
2 [Fast Stop (Use C1-09)]
3 [Alarm Only]
3 [Alarm Only]
4 [Run at H5-34 (CE Go-To-Freq)]
YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference
Cable Loss Timeout Cable Loss Speed
(AO 21) (AO 22)
Timeout Interval
Timeout Interval
Timeout Interval
0
Timeout Interval
Timeout Interval Preset speed
Communication Fault
Enable
(BO 11)
x ON
x ON
x ON
x x
x ON
ON