Temperature alarm
A temperature alarm is indicated by:
• A LED at the front
• An internal beeper
(TAR 1370H-2/TARN only)
• An alarm relay
(TARN-Types: Only if the fan relay is not
in use).
If the temperature measured by the control
sensor exceeds the range set by
P32/P33,
P18
shows the remaining time until an
alarm occurs.
After the delay timer
P31
is
run down, the alarm relay will be activated.
P32
is an alarm offset located relative to the
current setpoint
P03
resp.
P04
, so if the setpoint
is shifted, the offset remains constant.
If the alarm mode P30 is set to '4', the alarm
relay can be reset while the temperature is
located within the alarm range. This is usable
e.g. to switch an external signal horn. If the
temperature comes back to the working ran-
ge, the relay will be reset automatically.
Alarm relay / Beeper Operation Modes
Parameter
P30
fixes the alarm relay mode:
0
= Alarm relay active ON
1
= Alarm relay active OFF
2
= like 0, but internal beeper off
(TARN only)
3
= like 1, but internal beeper off
(TARN only)
4
= Alarm relay can be reset while
temperature is located within the alarm
range. Can be used e.g. to switch an
external horn.
5
= Continuous ON of alarm relay if
control setpoint 2 is activated
(TARN 1380-2 only). Alarm messages
will be forwarded by alarm-LED only.
Function to switch light by time control.
5
= The alarm relay output works as fan
relay (TARN types only).
Alarm Beeper
(1370H-2 and TARN only)
These types contain an integrated beeper
(can be disabled by P30), which is activated
with the alarm output. The beeper can be
reset by any keypress.
Defrost
The unit is equipped with a defrost relay.
There is no need for external interlocking the
defrost output with the cooling output since
the temperature controller is disabled while
defrost. For information there is
P15
showing
the remaining time of the existing defrost
event until termination by time.
Defrost by Real time clock
(1380-2 only)
This type contains a real time clock with 6
settable times, which allows you to initiate four
defrost events a day and to switch to 'night'-
setpoint. The timer has a power backup for
about 10 days in case of power failure. The
clock time can be set by parameters
P34
and
P35
(minutes).
Because the display has only three digits, the
time value comes in the following format:
The defrost times are set by
P24
-
P27
in
10 minute increments in a 24 hour (military)
format.
Example: 13.20 = 01:20 p.m.
Switch times can be de-activated by setting
to '
oFF
'. The second setpoint depends on
P05/P06
.
Defrost Modes of the 1380-2 types
P23
determines the defrost mode, which
works independent from the control relay.
1 =
Heater or Airflow Defrost
- Defrost relay active ON
(= defrost heater ON)
- Cooling relay switches OFF.
2 =
Hot Gas Defrost
- Defrost relay act. ON
(= bypass valve open)
- Cooling relay keeps the solenoid
valve open
3 =
Heater or Free Airflow D (
AZV
)
Relay characteristic like = 1.
Addtional generated defrost events.
4 =
Hot Gas D (
AZV
)
Relay characteristic like = 2.
Addtional generated defrost events.
3rd Position=
minutes x 10
1st. and 2nd
Position =
hours
Defrost time doubling
(AZV
, 1380-2 only
)
This is a simple function to double the
quantity of the potential defrost events (4
—> 8). The unit generates new defrost
times automatically by adding 12 hours to
existing times.
Example:
If a defrost cycle is fixed at 14:30, an
additional cycle starts at 2:30am without
entering this time.
Defrost by Cyclic Timer
(1370(H)-2 only)
P24
determines the interval time up to the
next defrost event,
P28
fixes the defrost
duration. The cyclic timer starts with power-
up of the TAR, the first (automatic) defrost
event is possible first after the end of the
first interval time.
Defrost modes of the types 1370-2,
1370H-2)
P23
fixes the defrost mode.
1 =
Heater/Airflow Defrost by Cyclic Timer
- Defrost relay act. ON
(= defrost heater ON)
- Cooling relay switches OFF.
2 =
Hot Gas Defrost by Cyclic Timer
- Defrost relay act. ON
(= bypass valve open)
- Cooling relay keeps the solenoid
valve open
3 =
Heater/Airflow Defrost by
Machine Runtime
Like 1, but depending on the added
ON times of the cooling relay.
4 =
Hot Gas Defrost by Machine Runtime
Like 2, but depending on the added
ON times of the cooling relay.
Manual Defrost
• At parameter
P37
by key "
"
or
• While the actual temperature can be read
on the display, by holding key "
" key for
more than 2 sec.
Defrost Termination
•
Thermal termination
.
Defrosting will be terminated whenever
the evaporator sensor temperature (
P02
)
exceeds the temperature limit set with
parameter
P22
.
•
Termination by (safety) time
.
The time set with parameter
P28
is the
maximum time a defrost cycle can last
before it is terminated automatically.
•
Manual termination
.
With parameter
P37
you can terminate a
defrost cycle by pressing "
" key.
or
While the actual temperature (
P01
) can
be read, a defrost event can be terminated
by holding "
" key for more than 2
seconds.
• If the defrost limit sensor is interrupted,
the defrost event will be stopped immedi-
ately.
After the defrost event is terminated, a drain
time
P29
delays the begin of the cooling
function.
P16
shows the remaining time until
cooling starts again.
(DH) Display Hold-Funktion
The
DH
function can be initiated by
P38
.
It holds the Actual Value Display while a
defrost event. During defrost the display
shows the last measured actual value before
defrost start. After defrost termination: If the
actual value is higher than the stored display
value, the display keep unaltered for further
15 minutes max. If the actual value falls 2K
below the stored display value, the display
shows the actual value again.
Evaporator Fan Control
Fan operation modes can be selected by
P13
.
At TARN-types the alarm relay output can be
selected (by
P30
) as fan relay alternatively.
1 =
Fan runs if cooling output is active.
With defrost termination the fan output
is OFF until the Fan Delay Time (
P14
)
is run down.
2 =
Fan runs continously, except during
defrost and Fan Delay Time (
P14
) after
defrost.
Fan trailing: The fan stops if the temp-
erature at the evaporator sensor exceeds
P12
.
3 =
Fan runs if the compressor output is on,
and during defrost
.
The temporal fan delay must be set
to "0".
For all 3 fan operation modes at the
same time there is a thermostatic fan
delay active, because the fan starts
only if the evaporator temperature falls
3K below P12. If this function is not desi-
red, P12 can be set to its upper threshold
to make it inefficient.
After the end of a defrost cycle
A temporal fan-ON delay is active after a
defrost event (
P14
). While drain time (
P29
)
the fan remains stopped.
(
P17
) informs about the remaining time until
the fan starts again.
Practical conditions
If you want to realize a thermostatic delay,
select fan mode
2
and adjust setpoint
P12
.
If you want to realize a thermostatic delay
and airflow defrost, please realize a parallel
connection of fan relay and defrost relay.
CONNECTION INFORMATION & SAFETY INSTRUCTIONS
The guarantee will lapse in case of damage caused by failure
to comply with these operating instructions! We shall not be
liable for any consequent loss! We do not accept liability for
personal injury or damage to property caused by inadequate
handling or non-observance of the safety instructions! The
guarantee will lapse in such cases.
This manual contains additional safety instructions in the
functional description. Please note them!
If you notice any damage, the product may not be connected
to mains voltage! Danger of Life!
A riskless operation is impossible if:
• The device has visible damages or doesn't work
• After a long-time storage under unfavourable conditions
• The device is strongly draggled or wet
• After inadequate shipping conditions
• Never use this product in equipment or systems that are
intended to be used under such circumstances that may
affect human life. For applications requiring extremely
high reliability, please contact the manufacturer first.
•
The product may only be used for the applications
described on page 1.
• Electrical installation and putting into service must be
done from qualified personnel.
•
During installation and wiring never work when the
electricity is not cut-off ! Danger of electric shock!
•
Never operate unit without housing.
Danger of electric shock!
•
All ‘PE’ terminals must be connected to ground.
Danger of electric shock!
Without PE the internal noise
filter will not work, faulty indicated values may occur.
• Please note the safety instructions and standards of your
place of installation!
• Before installation: Check the limits of the controller and
the application (see tech. data). Check amongst others:
- Make sure that all wiring has been made in accordance
with the wiring diagram in this manual.
- Supply voltage (is printed on the type label).
- Environmental limits for temperature/humidity.
- Maximum admitted current rate for the relays. Compare
it with the peak start-up currents of the controlled loads
(motors, heaters,etc.).
Outside these limits malfunction or damages may occur.
• Sensor/probe cables must be shielded. Don’t install them
in parallel to high-current cables. Shielding must be
connected to PE at the end close to the controller.
If not, inductive interferences may occur.
• Please note for elongation: The wire gauge is not critical,
but should have 0,5mm² as a minimum.
• Mounting the controller close to power relays is
unfavourable. Strong electro-magnetic interference,
malfunction may occur!
• All used temperature sensors must be identical. Never
use different types at the same time. This will not work.
• TF-type sensors are not designed for being immersed in
fluids permanently. In such a case, always use dip-fittings.
With extreme temperature variations, the sensor may be
damaged.
Cleaning
The use of a dry, lint-free cloth is sufficient to clean the product.
Never use liquids or acidic fluids! Risk of damage!
Danger
Notice
Caution
