Digital Input Functions; Dual Action Heating-Cooling - Wachendorff UR3274 Series Manual

7.11

Digital Input Functions

Digital input is programmable for several functions which
are useful to simplify controller operability. Select the chosen
function on parameter 50
• Hold function (enabled by setting
to lock the reading of sensors when the digital input is active
(useful for wide ranging oscillation on less significant values).
During the hold phase, display 2 flashes and shows
• Enables/disables the autotuning function by digital input
if the parameter
• Enable regulation with
• Switch from automatic to manual functioning if
set on
en.
• Start of pre-programmed cycle (see par. 7.7) with
• Change setpoint function.
This function is useful where there are 3 to 4 working thres
holds required during system functioning without having
to press the arrow keys.
To enable the function use the parameter
selecting the number of setpoints desired (no. thresholds
switch). They can be switched during functioning by
pressing the
NB: digital input functions are not available with sensors
PT100, NI100, NTC, PTC, PT500, PT1000 and potentiometers.
7.12

Dual Action Heating-Cooling

UR3274U is suitable also for systems requiring a combined
heating-cooling action.
88
UR3274U - User manual
tune
or
en.st.
key.
dGt.i.
L.c.n.o.
is set on
man.
or
rn.n.o. rn.n.c.
or ) allows
L.c.n.c.
Lock
au.ma.
st.st.
, by
op.Mo.
.
is