GENERAL INFORMATION
The ST……112 controllers are designed for
general use in refrigerating plants.
Depending on the existing hardware, up to four
temperature sensors can be connected. These can
either be used for capturing the cold store
temperature, evaporator temperature, super-frost
core temperature, the temperature of a second
control circuit or the temperature of the condenser.
The type, function, offset and weighting of each
sensor can be configured separately via
parameters. Additionally, an analogue input
(4..20mA) can be made available for capturing
pressure levels, e.g. for condenser/fan control,
provided that the required hardware is available.
The max. four digital inputs can also be configured
separately, depending on the hardware installed.
Possible functions include: standby, door contact,
high-pressure or low-pressure switch.
Depending on the hardware, up to eight relay
outputs are possible the functions of which can be
configured as required via parameters. Please
refer to the specifications of the hardware installed
to ensure that the relays are not overloaded. Also
refer to the circuit diagram in the corresponding
device manual.
All parameters can also be accessed via the
RS485 interface. If an internal clock is provided in
the hardware, the corresponding functions, e.g.
defrosting or night-time increase/decrease of
setpoint, can be set and started via parameters.
CONTROL KEYS
Key T1:
UP ( up-arrow )
By pressing this key the parameter or
parameter value is increased. A further
function of the key can be set with parameters
.
Key T2:
DOWN ( down-arrow )
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 T5: SET
While
SET1
key is pressed, the setpoint is
indicated. The function of the key can be set
with parameter
(unchangeable in this case).
Key T6:
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 cooling controller is generally controlled using
the buttons
UP
,
DOWN
and
SET
. The standard
display indicates the temperature of the cold store
(actual temperature value). Press
SET
button to
switch over the display to the required cold store
temperature (setpoint temperature).
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 cooling controller is
switched off and the message
will be
displayed. To switch on the controller again, press
the
STANDBY
button again.
T1
T2
T3
T4
T5
T6
1
2
3
4
5
6
7
8
9 10 11 12 13
SET
