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When an on/off input type is selected, the
humidity setpoint will be displayed. The
required relative humidity percentage (%RH)
can be changed via the change button. The
default value for this is 100%. It should be
noted that this will be "greyed out" for all
other types of input control device.
• The set maximum service interval will be
displayed. This is the amount of hours that
will pass before "Service Required" will
be displayed on the screen. This can be
increased or decreased to suit the specific
site requirements. The default setting for this
is 2000 hours.
• The set full drain interval will be displayed.
A full drain interval is the time (in hours)
before the unit automatically conducts a
full cylinder drain (90 second drain), before
beginning a new feed / boil cycle. This can
be increased or decreased to suit the specific
site requirements. The default is 6 hours,
however, the function can be deactivated by
setting to 0.
2. Commissioning Mode Page 2
The Vapac controller will provide PID
(proportional, integral and derivative) control
when used with a humidity sensor. In this
instance:-
• The set proportional factor will be displayed.
The proportional component depends only
on the difference between the set point
Vapac, Virtuoso VE Humidifier, Installation Manual, EN 2024-01, D301474 Iss 0
and the process variable. This difference
is referred to as the Error term. The
proportional gain determines the ratio of
output response to the error signal.
For instance, if the error term has a
magnitude of 10, a proportional gain of 5
would produce a proportional response of
50. In general, increasing the proportional
gain will increase the speed of the
control system response. However, if the
proportional gain is too large, the process
variable will begin to oscillate. This can be
changed via a setting screen. The default
value is 750mS.
• The set integral factor will be displayed. The
integral component sums the error term over
time. The result is that even a small error
term will cause the integral component to
increase slowly. The integral response will
continually increase over time unless the
error is zero, so the effect is to drive the
Steady-State error to zero. Steady-State error
is the final difference between the process
variable and set point. This can be changed
via a setting screen. The default value is
40mS.
• The set number of feed / boil events will
be displayed. As a default the system is
set to carry out 4 feed / boil events, before
completing a default drain. The number
of events can be increased or decreased if
required to suit the specific site conditions.
• The set default drain time will be displayed.
This setting is the time duration of the drain.
The default setting is 3 seconds. This can
be increased or decreased to suit the specific
site conditions.
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