GENERAL INFORMATION
The ST……126 controllers are designed as multi-
stage temperature controllers and offer numerous
characteristics intended for cooling industries.
Depending on the hardware, up to six relay outputs
are possible the functions of which can be
configured as required via parameters.
A special exchange and replacement logic
guarantees a balanced load of the connected
modules in case of partial load operation.
Operating times are recorded.
To protect the connected compressors minimum
downtimes can be specified for each exit
separately. In addition a mutual switch-on delay is
possible. In case of a remaining control deviation a
setpoint offset can be adjusted, which is not visible
in the display.
Depending on the existing hardware, a
temperature sensor or a linear senor (pressure)
can be connected. The type, function, offset and
weighting of each sensor can be configured
separately via parameters.
The max. two digital inputs can also be configured
separately, depending on the hardware installed.
Possible functions include: standby, setpoint
changeover.
The controller is equipped with six relays whose
function is determined by the operating mode set
with parameter A44. If a relay is not used by A44,
its function can be set with parameter A51...A56.
Please note the specifications of the respective
hardware so that the relays are not overloaded.
All parameters can also be accessed via the
RS485 interface.
CONTROL KEYS
Key T1:
UP
By pressing this key the parameter or
parameter value is increased. A further
function of the key can be set with parameter
.
Key T2:
DWON
By pressing this key the parameter or
parameter value is decreased. A further
function of the key can be set with parameter
.
Key T3:
Function key
The function of the key can be set with
parameter
.
Key T4: SET
While
SET
key is pressed, the setpoint S1 is
indicated.
Key T5:
StandBy
The function of the key can be set with
parameter
. It is preset as standby key.
Thus the unit can be switched on or off (no mains
disconnection).
The controller is generally controlled using the
buttons
UP
,
DOWN
and
SET
. The standard
display indicates the actual value of the activated
sensor, either a pressure (bar) or a temperature
(°C). Press
SET
button to switch over the display
to the required setpoint.
The setpoint temperature can only be changed by
pressing buttons
SET
and
UP
or
SET
and
DOWN
at the same time. While pressing the buttons, the
changing setpoint temperature is displayed. After
changing the setpoint temperature and releasing
the buttons, the actual temperature is displayed
again. This is the standard setting method.
If you press the
STANDBY
button during operation
(for at least 3 seconds), the controller is switched
off and the message set with parameter
will be
displayed. To switch on the controller again, press
the
STANDBY
button again.
SET
T1
T3
T5
T2
T4
3
2
1
Summary of Contents for ST710-PWHVR.126
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