8
4.2
Automatic / manual operation of controller
Automatic operation
of controlling requires the closed control loop. The user adjusts stp value and the controller regulates the
output power that is supplied to system.
At
manual operation
the user adjusts the required output power.
Manual operation
Manual operation is set by double pressing the key
. It must be allowed by setting parameter
FKEY
=
A-M
. Parameter
FKEY
is found in
configuration level
, menu
SYS
.
Important:
•
When in manual operation the controller can not influence the output power that is set by a user. The behavior of the
system is then fully under users control.
•
When in manual operation,
Man
blinks on lower display.
•
The controller remains in the chosen mode of operation even after the power interruption.
•
In manual operation the zero output power is set after the power interruption.
•
In manual operation the output power is always set in % (0 to 100 for heating, -100 to 0 for cooling, -100 to 100 for
heating and cooling) and even in the case that the output is configured as the ON/OFF output.
4.3
Parameters of the control output, PID controlling
The controller Ht40B can be configured for ON/OFF as well as PID controlling and it enables:
•
Heating controlling (the output 1).
•
Cooling controlling (the output 2).
•
Controlling of heating and cooling (the output 1 and 2).
The description of principals of controlling is found on page
16
.
Heating, ON/OFF controlling
ON/OFF controlling of heating is set with the parameter
ot1
=
ht2
. Parameter
ot1
is
found in
configuration level
, menu
out1
.
In
operation level
you set hysteresis of ON/OFF controlling, parameter
hYS1
.
Heating, PID controlling
PID controlling of heating is set with parameter
ot1
=
ht
. Parameter
ot1
is found
in
configuration level
, menu
out1
.
In
operation level
you set PID parameters:
•
Pb1A
,
It1A
,
dE1A
, If only 1 set of PID parameters is used (parameter
ALGo
).
•
Pb1A
,
It1A
,
dE1A
,
Pb1b
,
It1b
,
dE1b
, if both sets of PID parameters are used.
Cooling, ON/OFF controlling
You switch between automatic
and manual operation by double
pressing the key „F“
In
automatic operation
lower display shows stp
value.
In
manual operation
lower display shows the set
output power in %.
In
automatic operation
you set stp value with the
arrow-keys.
In
manual operation
you set the output power in %
with the arrow-keys.
Process value is shown on
upper display
hYS1
SP1
SP1