Publicité
English
Contents
1. Application
2. Technical data
3. Assembly
4. Electrical connection
5. Commencing operation and control
behaviour
6. BUS System (Model No. SK 3124.000)
7. Technical information
8. Maintenance
9. Scope of supply and guarantee
10. Fault indication and fault analysis
11. Programming
1. Application
Enclosure cooling units are designed and built
to dissipate heat from enclosures, by cooling
the air inside the enclosure and protecting tem-
perature sensitive components. Enclosure cool-
ing units are particularly suitable for the
temperature range of + 40 °C to + 55 °C.
2. Technical Data
(see table 2.1)
3. Assembly
Make 2 cut-outs and screw holes in the top of
the enclosure in accordance with fig. 3.1.
Prior to mounting, ensure that
the site for the enclosure, and hence the
arrangement of the cooling unit, is selected
so as to ensure good ventilation;
the location is free from excessive dirt and
moisture;
the mains connection ratings, as stated on
the name plate, are available;
the ambient temperature is no higher than
+ 55 °C;
the packaging shows no signs of damage.
Traces of oil are an indication of coolant loss
and of leakage in the unit system. Any
damage to the packaging can become the
cause of a subsequent function failure;
the enclosure is sealed on all sides.
Condensation will occur if the enclosure is
leaky;
the separation of the units from one another
and from the wall should not be less than
200 mm;
air inlet and outlet must not be obstructed on
the inside;
units should only be fitted vertically in the
specified position. Max. deviation from true
vertical: 2°;
condensate drainage is provided (see 6.3);
electrical connection and repair must be
carried out only by authorized specialist
personnel. Use only original replacement
parts!
To avoid an increase in condensation, a door
operated switch (e. g. PS 4127.000) should
be used which will switch the cooling unit
off when the enclosure door is opened
(see 5.2.3.3).
Stick the enclosed sealing gasket onto the
enclosure roof.
Important: To achieve a permanent seal
between the cooling unit and the enclosure, the
mounting surface may have to be strengthened
or supported (see example on PS 3256. . . .,
fig. 3.2).
6
Accessories for roof plate stiffening on the PS:
Mounting rail
"U" nut
Fixing bracket
Threaded block
SK 3290. . . . / 3280. . . . / 3296. . . . / 3272. . . . –
6 x M6 SK 3256. . . . – 8 x M8 screw setscrews into
the blind nuts on the underside of the unit and fix
the unit with washers and nuts from underneath.
For transportation of unit by crane: remove the
blanking plug and screw in an eyebolt M12.
4. Electrical Connection
The connected voltage and frequency must corre-
spond to the values stated on the name plate. The
cooling unit must be connected to the mains via
an isolating device, which ensures at least 3 mm
contact opening when switched off. The unit must
not have any additional temperature control con-
nected before it. Line protection should be provid-
ed by means of the pre-fuse specified on the
name plate. Observe the relevant regulations
during installation!
Version . . . . .100
Connection should be made to the cable attached
to the unit (see Detailed Wiring Diagram).
Version . . . . .500
Connect the mains connection to the plug-in ter-
minal strip X 10 (see Wiring Diagram).
Door limit switch, see 5.2.3.3
Collective fault signal connection, see 5.2.3.1
Note the designations on the terminal strip
(see Wiring Diagram).
The unit must be disconnected prior to
checking the protective earth conductor, high
voltage and the insulation in the enclosure.
5. Commencing Operation
and Control Behaviour
Following the completion of mounting and a
waiting period of approximately 30 minutes (to
allow oil to collect in the compressor in order to
ensure lubrication and cooling) electrical connec-
tion can be made.
5.1 Control by Thermostat
Version . . . . .100
The cooling unit operates automatically, i.e. follow-
ing the electrical connection, the evaporator fan
will run continuously to circulate the air inside the
enclosure. This provides a uniform temperature
distribution in the enclosure. The built-in tempera-
ture controller (setting the desired internal temper-
ature) effects automatically controlled switch-off
of the cooling unit by the value of the fixed
switching difference setting of 5 K. This is set at
the factory to + 35°C.
5.1.1 Temperature Setting at the Controller
Fig. 5.1 Thermostat
20
30
40
50
60
°C
Set the desired temperature. Setting range
+ 20°C to + 55°C.
To avoid cyclic operation of the compressor, it is
imperative that the set switching difference of 5K
is not changed and does not deviate to a lower
value.
5.2 Control by Microcontroller
Version . . . . .500
Fig. 5.2 Microcontroller
H1
H2
°C
TEST
°F
H3
After electrical connection the internal fan turns on
and circulates the enclosure air. This helps assure
even temperature distribution within the enclosure.
The condensor fan and compressor are con-
trolled by the microcontroller. The minimum run
time is 90 seconds. The switching difference is
5 – 10 K and is set at the factory. In order to
maximize energy efficiency the thermostat should
be set to the highest enclosure temperature as
allowed by the electronics.
5.2.1 Operation of the Microcontroller
The display terminal H1 consists of a 3 position
7-segment display which indicates the enclosure
internal temperature in °C or °F (changeable, see
section 5.2.2) as well as any fault codes. The
actual enclosure internal temperature is con-
stantly displayed. If a fault occurs then the fault
number is indicated in the left position. When pro-
gramming the microcontroller the program level
and parameter value is indicated on the display.
When the "TEST" button is pushed the compres-
sor and the fans will run for 5 minutes regardless
of the internal temperature or door limit switch.
This allows for a system test after an extended
shutdown period (e.g. after the winter).
5.2.2 Programming
In the EEPROM of the microcontroller various
parameters are stored which can be changed
through using the "ENTER" and "
9 different parameters are changeable as outlined
in table 5.1. To access the programming mode
push both the "ENTER" and "
neously for 10 seconds. The left digit will then
indicate the program level and the LED for the
"ENTER" and "
" buttons will blink. By pushing
the "
" button the program level can be ad-
vanced to the next level. In order to access levels
5 through 9 a security code must be entered. If no
buttons are pushed for 60 seconds the display will
return to the standard mode which displays the
enclosure temperature. Programming of the para-
meters is made easy with diagram 5.1 on page 35.
A description of the parameters to be program-
med can be found in table 5.1. All parameters are
stored in the EEPROM and are retained when
power is shut off to the air conditioner.
5.2.3 Fault Signalling Facility
All faults on the cooling unit are registered and
indicated by H1 as a fault number. The display is
by means of the left-hand number. The display
cycles through all pending fault messages in a
2 second cycle, starting with the internal tempera-
ture of the enclosure.
H1 indicates the following faults as a fault number:
1 = Enclosure internal temperature too high
(5 K above setpoint value)
2 = Current monitor, condenser
3 = Evaporator (no collective fault indication)
4 = High-pressure monitor
5 = Current monitor, condenser fan
Diff.
6 = Current monitor, evaporator fan
°C
7 = Filter mat soiled
8 = Temperature sensor cable break/short-circuit
25
10
35
8
45
6
55
4
3
°C
H4
H5
ENTER
H1 = Display Terminal
H2 = LED °C
H3 = LED °F
H4 = LED ENTER
H5 = LED
" buttons,
" buttons simulta-
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