17
Digital outputs
6 Installation
Instruction book, IQAN- XT2
Digital outputs
The digital outputs control relays and on/off valves.
For the maximum load per output see Appendix A, on page 23.
Soft start
Soft start
is used whenever start up is required to be smoother than the normal
procedure offers. A desired ramp function secures the smoother start up according to
the figure below. The ramp function is set up from within IQANdevelop.
The Soft start function.
Peak and Hold
The
Peak and Hold
feature makes it possible to decrease the voltage to the valve
solenoid. Shortly after a valve has been activated, the voltage can be decreased to a
lower level, sufficient to maintain the position of the valve, but also reducing the heat
generated in the valve (due to this lower voltage). The reducing of heat, is the primary
reason for selecting the
Peak and Hold
feature. Both the peak time and the hold value
are set up from within
IQANdevelop.
The Peak and Hold valve voltage graph.
Max
t
Soft start
Output signal [V]
Peak
Hold
value
t
Output signal
