Cool Expert MIC QKL mini 2 Manuale d'installazione e d'uso - Pagina 2
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Setpoint temperature
-50 to 50 °C / -58 to 121 °F, in increments of
adjusting range
0.1 K/0.5 °R
Switching hysteresis
± 0.5 K / 0.9 °R adaptive from setpoint
Control accuracy
± 0.3 K / 0.7 °R from setpoint
Supply voltage
24 V ± 20 % AC/DC 3 VA
Ambient temperatures
in storage
during transport -50 to 70 °C / -58 to 158 °F
in operation
LED display
7- segment display with 7 function messages
Measuring range
-60 °C / -76 °F to 60 °C / 140 °F
Resolution
0,1 K / 0,5 °R
General safety instructions:
Cool Expert shall not under any circumstances assume liability or responsibility
for damage resulting from improper installation or use of the control or
accessories.
Functional warranty only in connection with sensors from Cool Expert (MIC
Sensor Pt1000).
Appropriate safety devices, which switch off the system components connected to
the control in the event of a fault, have to be provided.
Never attempt to open or repair the MIC QKL mini 2 control.
Observe the local and national standards and regulations when installing the MIC
QKL mini 2 control.
The MIC QKL mini 2 is supplied with a protective low-voltage of 24 V AC/DC. The
transformer required for this must comply with EN 61558-2-6 or EN 61558-1.
Work instructions:
Electrical installation
Prior to beginning all work on the MIC QKL mini 2 control, disconnect the device
from the mains and secure it from switching on again inadvertently!
As a matter of principle, electrical installations are to be carried out by authorized
specialist companies only. The VDE 0100/0700 and DIN 8975 Part 7.33 as well as
the regulations of the local electricity supplier and all other safety and protection
regulations, including the performance specifications of the components
connected, must be observed.
A separator with a contact opening width of at least 3 mm / 0.12 in must be fitted at
each pole (main and service switch).
Following the appropriate electrical installation or inspection work, the safety
measures must be checked according to the applicable guidelines.
For use in potentially explosive rooms, the applicable guidelines for this must be
observed. The MIC QKL mini 2 control must be installed outside potentially
explosive areas.
For electric defrosting, a safety temperature limiter has to be provided for
switching off the defrost heating in the irregular case.
General instructions and information on working with the MIC QKL mini 2
The MIC QKL mini 2 works as a self-optimizing multifunction control which saves
and evaluates data gathered from its sensors. All functions originating from the
MIC QKL mini 2, such as cooling request, air cooler fan management and defrost,
must be executed and ended by the control without any restrictions. The above-
mentioned functions must neither be bridged nor interrupted by components from
other manufacturers. Interruptions to the control functions listed above are
assessed by the MIC QKL mini 2 as a fault.
Housing and dimensions:
Mounting
Front panel installation with tension frame
Cut-out size
71x29 mm 72.8x1.14 in (for front panel installation)
Protection rating
according to EN60529 : Front IP 65 (fitted),
housing IP 20
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-50 to 70 °C / -58 to 158 °F
-20 to 55 °C / - 4 to 131 °F
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50
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Technical Specifications
Sensors
2 x MIC Sensor Pt1000 for three-wire
measurement technique
EMV Specification
for industrial use according to EN50081-1 and
EN50082-1
Software class
Class A
Outputs
4 relay outputs, 3 NO contact, 1 changeover switch,
max. switching capacity 8(3) A 250 V AC
Inputs
2 digital inputs, contact current > 2 mA, shading
only by means of potential-free contacts
Protection class II
when installed properly
Connecting terminals
terminal screws with lifting system 4 mm²
Communication
Optional network module
Safety and work instructions
The control is not limited to certain heat transfer media and can be used in direct
expansion, CO , pump operation, NH and dual-circuit refrigeration systems.
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Emergency programs provided in the control protect valuable chilled goods in the
event of a fault. Even in the case of total failure of both sensors, an emergency
running function for the cooler fan and cooling request is maintained depending on
the setpoint temperature.
One MIC QKL mini 2 control and a maximum of three air coolers
For smaller refrigeration systems with an overall refrigerating capacity of up to 6
kW, a maximum of three air coolers installed in one room can also be operated in
parallel with one MIC QKL mini 2 multifunction control. In the case of electric
defrosting, all the coolers have to be equipped with a safety temperature limiter.
Requirement for correct defrost detection
The MIC QKL mini 2 can only initiate a defrost process at the best time in terms of
energy if the cooling process begins immediately after its cooling request and is
also ended again by the MIC QKL mini 2. An incorrectly set vacuum or
overpressure switch results in problems in defrost detection. The cooling process
may be interrupted by the safety chain (vacuum or overpressure switch, etc.) only
in the event of a fault.
Exceeding of the maximum defrost time
If the maximum defrost time of one hour is exceeded in the event of a fault and the
calculated defrost end temperature is not reached, the control will switch to
cooling request and proceed ist regular control function.
Defrost suppression
It is possible to suppress the defrost processes via the digital inputs. After
cancelling the defrost suppression, the next defrost process can be carried out
after a minimum of 60 min. has elapsed.
Power supply and data memory
The data memory of the MIC QKL mini 2 is deleted every time there is a power
failure. When power is restored, the control begins a restart with error diagnostics.
Please make sure that there are no interruptions in the power supply and that the
control is not switched off by external switches, e.g. manual control switches for
stoppage. Frequent interruptions to the power supply result in ice build-up on the
air cooler.
Important! Please observe!
Uncontrolled intrusion of warm air through openings in the wall, ceiling, floor or
drains must be avoided in refrigerated units. Therefore, condensate drains must
be equipped with a siphon and additionally heated when operating at sub-zero
temperatures.
Positioning of the sensors TL1 and TBL
See installation manual "MIC Sensor Pt1000".
Installation and connection
Installation instructions:
Protection rating lP65
The user interface of the control in the outside area of the door is designed for
protection rating IP 65. The rest of the housing complies with the provisions of IP
20. To assure the protection rating of the control in the outside area of the door, the
cutout must be made to fit precisely for the purpose of fitting it into the control
cabinet door. The cut-out must be fully deburred. The plastic housing must not be
deformed from an incorrectly made cutout. The door surface must be flat and have
no unevenness. The wall thickness of the door should be at least 0.75 mm / 0.03 in.
Prior to fitting the control, check that the seal between the installation frame and
control cabinet door is inserted without any twisting. The tension frame pulls the
control evenly from the inner side of the door against the outer side of the door with
the necessary initial tension and fastens it.
When fitting the control, make sure that there is secure isolation from the other
modules in the control cabinet (according to VDE 0106, Part 101).
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