Owner's manual

Rockwell Automation Publication D2-3518-3 - May 2013 145
Chapter 9
Selects drive action when an analog signal loss is detected on user-configurable
analog input 2:
• 1.0V = signal loss
• 1.5V = end of signal loss
• 2.0 mA = signal loss
• 3.0 mA = end of signal loss
See AC Line I/O Board Description (Frame 3 Only)
on page 25 through
Combined I/O Board Description (Frame 4 Only)
on page 29 for a description
of I/O hardware that is present on this drive and is controlled by the inverter.
One of the selections (1=Fault) stops the drive on signal loss. All other choices
make it possible for the input signal to return to a usable level while the drive is
still running.
327 Analog In 2 Loss
Range: 0 = Disabled
1 = Fault
2 = Hold Input (use last frequency command)
3 = Set Input Lo (use Minimum Speed as frequency command)
4 = Set Input Hi (use Maximum Speed as frequency command)
5 = Goto Preset1 (use Preset1 as frequency command)
6 = Hold OutFreq (maintain last output frequency)
Default: 0 = Disabled
Access: 1 Path: Inputs & Outputs > Analog Inputs
See also: 91, 92, 320, 326, 327
ATTENTION: Setting parameter 327 to a value greater than 1 allows the input
signal to return to a usable level while the drive is running. If a lost analog
signal is restored while the drive is running, the drive ramps to the restored
reference level at the rate specified in Accel Time 1 (140), Accel Time 2 (141),
Decel Time 1 (142), and Decel Time 2 (143). Be aware that an abrupt speed
change may occur depending upon the new reference level and the rate
specified in these parameters. Failure to observe this precaution could result in
bodily injury.
IMPORTANT
Note that there is no signal loss detection while the input is in bipolar voltage
mode.