KT-230-2
25
column U
SER
S
ETTING
, in the menu M
AIN
S
ETUP
, Win-
dow S
ETPOINT
CONTROL
CHARACTERISTIC
.
8.4.2
Control via Modbus interface
• Plug or connect the cable to the CN14 terminal strip
In this case, the operating parameters can be mon-
itored via Bluetooth with the BEST SOFTWARE.
The technical requirements for Modbus communication
are described in the BEST SOFTWARE.
8.5
Connecting operation monitoring via the BEST
SOFTWARE
The BEST SOFTWARE accesses the compressor
module via a Bluetooth interface and establishes see
chapter Establishing communication via the BEST
SOFTWARE, page 27.
➙ If the Bluetooth interface is not to be used:
• CONNECT THE BEST INTERFACE converter to
the CN14 terminal strip (Modbus).
In this case, the power must be controlled via the
analog signal on terminal strip CN13.
• Guide the cable out of the module housing through a
free cable bushing and close the module housing.
8.6
Close module housing
• Check the cable connections of the protective con-
ductors for tightness.
• Replace the module housing cover and screw tight.
For 8-cylinder compressors: Fit terminal box cover
and screw tight.
9
Protective functions
During normal operation, the green LED lights up. The
LEDs are visible through a sight glass in the module
housing.
Before the measured value of a sensor reaches a crit-
ical limit, the compressor module issues a warning
message via the Modbus RS485 interface (CN14). In
this case, the yellow LED lights up. If a value signific-
antly outside the permitted range is measured, the
compressor module switches the motor off immedi-
ately. The red LED lights up.
The blue LED lights up when data is being transmitted
via the Modbus interface.
Depending on the measured values, up to 3 alarm
levels are defined. These alarms are recorded and dis-
played using the BEST SOFTWARE. The alarm levels
make it possible to programme a system controller in a
way that allows the compressor to be controlled within
the application limits.
Warning
The warning threshold is exceeded when the applica-
tion limit is almost reached. The yellow LED lights up.
This is a software message, not a safety reference. The
warning refers exclusively to the critical operating con-
dition of the compressor.
Critical alarm
The cut-out value is exceeded. The yellow LED lights
up. If the corresponding measured value does not drop
again within the corresponding time delay, the com-
pressor will be switched off. This cut-out is classified as
fault in the alarm list.
Fault
The cut-out value has been exceeded too much or for
too long. The compressor is switched off. The red LED
lights up.
