Al: Alarm Signal - Hitachi L100-004 HFE Manual

AL: Alarm signal

Terminal function
A digital output configured as AL is activated when an alarm condition exists and the inverter trips.
Configuration
C 21 C 22
Program one of the digital outputs 11 or 12 as AL output by entering the parameter 05 under C 21 or C 22.
Remarks
• When the AL output is configured as normally closed contact (i.e. no alarm signal when output is closed)
it is important to remember that a time delay exists from the time the input power is switched on until the
AL output is closed (deactivated) and thus a trip condition is indicated for a short time.
• The programmable digital outputs (including an output configured as AL) are of open collector type and
so have different electrical characteristics compared with the alarm relay output (terminals AL0, AL1,
and AL2). Especially the maximum voltage and current load ratings are much more restrictive than is the
case with relay outputs.
• After the inverter power supply has been switched off, the AL output remains active until the DC bus
voltage has dropped below a certain level. This time is depending, among others, on the load applied to
the inverter.
• The delay from the time a trip occurs until the AL output is activated is about 300ms.
Chapter 7 – Control circuit terminal functions
CM2 12 11
FM
27V max.
50mA max.
7-16