Order no. 900340.012
V1.54
Page 4
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: SET
While
SET
key is pressed, the setpoint is
indicated. The function of the key can be set
with parameter
(unchangeable in this case).
Key T4: Function key
The function of the key can be set with
parameter
.
Key T5: Function key
The function of the key can be set with
parameter
.
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
7 8 9 10 11 12 13
2
3
SET
