BETA Electronics RC33 II Series User manual

ATEX Industries srl
33078 S. Vito al Tagliamento – PN
Italy
Tel.: [phone] r.a.
web: www.ate .it - e-mail
: beta@ate .it
ATEX
reserves the right to make changes without further notice to any products herein to improve reliability, function
or design. ATEX does not
assume any responsibility for any improper use or application of any product or circuit
described herein. ATEX
products are not designed, intended, or authorized to be use as components in systems or
applications intended to support or sustain life, or for any other application in which the failure of the ATEX
product
could create a situation where personal injury or death may occur.
RC33 II Series
Electronic refrigeration
controllers
1.00 GENERAL DESCRIPTION AND INSTALLATION NOTICE
The RC33
models are controllers specifically designed to manage ventilated refrigerating units, for positive or negative temperatures. The
controllers have 2 analog inputs for ntc/ptc temperature probes (room and evaporator), optionally a digital-
input for an external switch and
relay outputs for compressor (16A), fan (5A) and defrost heater (8A). It is designed to perform defrost by electrical heater or hot-
gas; the
defrost end may be based on fixed time or by the evaporator temperature. RC detects temperature alarm conditions referred to the main
probe (#1), storing into its memory the last tree events (Haccp feature). Through the TTL port, an external
master device can read and write
the RC registers, in order to monitor and change its functioning (ModBus protocol over a serial line).
1.10 Installation notice
The installation must be done only by specialized personnel in according to the rules in f
orce in the country where the controllers are used. The
instrument is conceived for controlling and regulation, not for safety function. It must be installed in a place protected from extreme vibrations,
impact, water, corrosive gases, and where temperatur
e and moisture do not exceed the maximum rating levels indicated in the specifications.
The same directions are valid for the probe installation. The probe is not waterproof, it should be placed with its head upward, so that drops
would not penetrate into
the bulb and damage the sensor. Maintain the length of the electrical wires as short as possible in order to keep the
noise picked by them at low level; otherwise a shielded wire will be needed, and the shield will be connected to the ground.
1.20 ELECTRICAL WIRING
We recommend to protect the power supply of the controller from electrical noise, spikes and especially from voltage surges and drops. This
can be easily done following these recommendations:
-separate the power supply of the loads (compressor,
heaters, fans) from the power supply of the controller. This alleviates problems related to
voltage dips that can arise during the switch-on of the loads, that may disturb the controller’s microprocessor causing unexpected resets.
-the cables of the probe
s and the ones of the controller supply or the loads must be separated, to reduce spikes and noise on the sensor. This
improves the stability of the reading and it also makes the commutation of the device more accurate.
1.30 CRITICAL ENVIRONMENT
For applications in heavy industrial environment these rules should be followed.
-
After having identified the source of noise spikes, it is recommended to apply a line filter to the source in question of the type specifically
designed to solve EMC (Electromagnetic
compatibility) related problems. Sometimes it may be sufficient an RC type filter, also called
«snubber» , connected in parallel to the external relay coils, or circuit breakers.
- An independent power supply should be used to power the device in extreme conditions.
KEYBOARD FUNCTIONS
Enter:
to activate the programming mode and to view and to confirm the
new values.
Function: 1) to show the Haccp records; 2)
pushed for 5 seconds, to
start or s
top manually the defrost (if LFc=0) without waiting dSd, or to
switch on/off the controller (if LFc=1). The off mode, or stand-
by, is
stored in memory; 3)
in programming mode, to quit the parameters
menu without saving the new values (escape command).
Up: 1)
to display, for a few seconds, the probe 2 temperature and,
pushed twice, the probe 1 snap temperature; 2)
during the programming
mode, to scroll the parameters m
enu and to increase the value of the
selected parameter.
Down: 1) pushed together with th
e Enter key, for 5 seconds, to lock /
unlock the keyboard; 2)
during the programming mode, to scroll the
parameters menu and to decrease the value of the selected code.
Function
Enter
Up
Down
4.40 FAN parameters
Param. Description Range Default
Fod Default fan operating mode.
0: switched off; 1: thermostat mode, switched on if ( FSr < probe2 temperature < FSt ); 2: switched on. 0 .. 2 2
Fdd Fan operating mode during the defrost action.
0: switched off; 1: thermostat mode, switched on if ( FSr < probe2 temperature < FSt ); 2: switched on. 0 .. 2 0
Fdc Fan operating mode when the compressor is switched off.
0: switched off; 1: thermostat mode, switched on if ( FSr < probe2 temperature < FSt ); 2: switched on. 0 .. 2 1
FSr Fan start temperature. If the fan is on thermostat mode, it is switched on if the temper. of probe 2 is higher than FSr. -50 .. FSt °C -45 °C
FSt Fan stop temperature. If the fan is on thermostat mode, it is switched off if the temper. of probe 2 is higher than FSt. FSr .. 150 °C 2 °C
FtH Fan temperature hysteresis for thermostat mode. Delta temperature value to avoid regulation oscillations of the fan. 0.1 .. 20 °C 1 °C
FSd Fan start delay at power on and after defrost.
At the power on of the RC and after the defrost end, the fan is switched off for FSd minutes. 0 .. 120 minute 0 m
Note: If thermostat mode operation is set for the fan (Fod=1 or
Fdd=1 or Fdc=1), in case of PF2 error the fan is switched off.
Installation and
operating instructions
Light on  compressor is running;
Flashing  waiting for a time delay to switch on the compressor.
Light on  fan is running;
Flashing  waiting for a time delay to switch on the fan.
Light on  defrost action is running;
Flashing  defrost optimization is running.
The upper left point is flashing in programming mode and is lit on if an external
contact is active (digital input) or during the stand-by mode.
Numbers 1, 2 indicate the current probe temperature shown on the display.
Rev.: 19-11-2008 Cod.: 82 00.0100.0
Note: if PF2 error, the defrost
will be performed every dPt
hours for ddt minutes, without
control of dEt and dEo.
4.50 Various parameters
Param. Description Range Default
Eio
External contact digital input operation (e dio).
Negative value: digital input signal is active if external contact is closed. Positive value: dig. input is active if contact is opened.
0: disabled ; ±1: cold room’s door open, switch off the fan; ±2 : door open, switch off fan & compressor ; ± : St2 is the
desired temperature (instead of SEt); ±4: start defrost (for another defrost start command, de-activate and activate again the
e t.contact); ±5: toggle to stand-by mode (the off state is not stored in memory); ±6: external alarm, switch off all the relays.
-6 .. 6 0
Eid Ext. contact input delay (ex did). From the activation of the external contact, RC waits Eid minutes to start the Eio function. 0 .. 60 minutes 0 m
Prt Probes type. 0: both probe input lines are able to read 10Kohm NTC temperature sensor; 1: 5Kohm NTC; 2: 990ohm PTC. 0 .. 2 0
Pr2 Probe 2 analog input enabling. It is possible to disable the evaporator probe measure. 0: probe 2 disabled; 1: enabled.
When probe 2 is disabled: defrost actions will be ddt long, the fan in thermostated mode will be switched off. 0 .. 1 1
rES Display temperature resolution. 0: the temperature is shown in tenths of degrees; 1: temperature without decimal point. 0 .. 1 0
Unt Temperature unit measurement. 0: Celsius degree; 1: Fahrenheit degree.
(changing Unt value, RC33 doesn’t match any parameter. Rearrange temperature param. values in order to adjust the control) 0 .. 1 0
oF1-2 Temperature probes calibration. To modify the temperature value measured by the probe 1 and by the probe 2. -10 .. 10 °C 0 °C
tdi
Temperature displayed. 0: temperature probe 1 (cold room); 1: temperature probe 2 (evaporator); 2: SEt value.
Pressing the “Up” key it is possible to display for a few seconds the temperature measured by probe 2 and then 1. 0 .. 2 0
utd Update temperature filter. Different averages are performed to avoid noise spikes on the probes measurements.
0: filter disabled ( measures displayed per seconds); 10: the temperature average is evaluated on the longest time span. 0 .. 10 5
LFc Long pushing Function configuration.
0: pushing for 5s the “Function” key start/stop defrost; 1: pushing for 5s the “Function” key toggle on/off the RC (stand-by). 0 .. 1 0
PSS Password setting. It is possible to set a password to access on the 2nd menu parameter. 0: password request disabled. 0 .. 999 0
LVS Low voltage sensing. In order to improve the functioning, the controller continuously verifies the power supply voltage.
0: function disabled; 1: short voltage drop is not detected (min sensitivity); 10: short voltage drop is detected (max sensitivity). 0 .. 10 1
nAd
Slave device number address. It is the address of the controller in a bus network with ModBus-RTU protocol.
0: serial port is disabled. When a key is pushed or in programming mode, RC does not always answer to the serial port.
(after having changed this value, the RC33 must be restarted)
0 .. 247 0
5.00 Troubleshooting
Message Description, cause Output
Hit The measured temperature of probe 1 (cold room) is higher than the (AHi+0,4)
parameter value. If AtP=1, the temperature is higher than (SEt+AHi+0,4).
The outputs don’t change.
*The controller starts to save the alarm data (haccp).
Lot The measured temperature of probe 1 (cold room) is Lower than the (ALo-0,4)
parameter value. If AtP=1, the temperature is lower than (SEt-ALo-0,4).
The outputs don’t change.
*The controller starts to save the alarm data (haccp).
ALE Extern alarm. When Eio=±6 and the external contact is active. All the outputs relay are switched off.
PF1 The probe input line 1 (cold room) is opened/disconnected or short circuited.
The measured temperature is out of the range.
Compressor operation is according to PEc.
Other outputs don’t change.
PF2 The probe input line 2 (evaporator) is opened/disconnected or short circuited.
The measured temperature is out of the range.
The defrosts are performed by time; no checking dEt, dEo.
The fan is switched off (except when fan is set On).
PrF The probe input line 1 + 2 is opened or short circuited. See PF1 + PF2 output.
EEP Memory error. The parameter list could be corrupted. The fridge control is not assured.
Immediately check every parameter value, save the correct value, restart the RC . Not predictable.
LoV Low voltage detection on the power supply. Check the voltage value, noises (par. 1.20). All the outputs are switched off.
dOP Door opened. When Eio = ±1 or ±2 and the external contact is active. Eio=±1, switch off the fan output;
Eio=±2, switch off compressor and fan output.
OFF The controller is going to switch off the outputs and display (stand-by mode). All the output relays are switched off.
FSr
on
temperature probe 2
FSr-FtH
off
FSt-FtH
FSt
off
Fan output if thermostat mode selected
the defrost duration won’t be longer than ddt
dEo
dEt
dEt-2
time
The heater
melt the ice
Residual ice on the
evaporator makes the
temperature to drop
Heater ON
the defrost duration won’t be longer than ddt
Defrost action
Evaporator
temperature
Probe 2
dEt
time
defrost END
(the evaporator temperature
reaches the dEt value)
The heater
melts the ice
Heater ON
Evaporator
temperature
Probe 2
defrost end optimization
defrost
END

Frontal dimensions: 4.5 x 76.5 mm
Mounting hole dim.: 29 x 71 mm
REAR BOX
3.00 SETTING THE RC33
3.10 Menu Level 1 Adjust the main (SEt) and secondary SET POINT (desired temperature value)
1) Press and release the Enter key “↵”, SEt is displayed. The upper point will flash to indicate programming mode entering. To view/change St2,
press “5” or “6” to move to St2 (energy saving secondary Set Point);
2) Press and release “↵” to view the Set Point value, adjust it by using “5” or “6” (it is only possible values inside the SLo and SHi range);
) Press and release “↵” to confirm the data, after 15sec. the RC will leave programming mode and the new data will be stored in the memory.
3.20 Menu Level 2 Adjust all the other OPERATING PARAMETERS
1) Press the Enter key “↵” and hold it for 6 seconds. The upper point will flash to indicate programming mode entering. If no password is set
(PSS=0), the code of the first variable SHy will appear, go to point 3. If password is set, will appear “PAS” request;
2) (password request) Press and release the Enter key “↵”, “0” will be shown; press “5” to enter the right password value and then press and
release the Enter key to confirm it. If the value entered does not match the stored password (PSS), the controller exits the programming mode;
) (SHy showed) press “5” or “6” to scroll all the parameter codes;
4) While a code is displayed press and release the Enter key “↵” to view its content, adjust it by pressing “5” or “6”;
5) Press and release “↵” to confirm the data, after 15sec. the RC will quit the programming mode and the data will be stored in the memory.
WARNING:
- the instrument must not be reset before leaving the programming mode, otherwise the new setting will be lost;
- if the “Function” key is pressed during the programming mode, the user will exit the progr. mode without saving, RC will loose the new setting;
- the controller authomatically interrupts any setting operation if any push-button isn’t pressed for at least 15 seconds and store the current data;
- after having modified any parameter the controller must be restarted (unplug and plug again) .
3.30 Keyboard locking
Press and hold both the Enter key “↵” + the Down key “6” for 6 second, in order to lock and unlock the keyboard (the upper-left point will flash).
If the controller shows “Pof” it means the keyboard is locked, if it shows “Pon” the keyboard is unlocked.
When the keyboard is locked it is possible to view any parameters value but not to change them.
3.40 How to show the stored alarm temperatures (Haccp feature)
The RC stores the last temperature alarm events: the temperature of probe 1 has been lower than ALo or higher than AHi.
- when the controller is showing the temperature (i.e. not in programming mode), press and release the “Function” key;
- it will show “HcP” (Haccp) and, if any alarm data are stored, it will show “AL1”, min/max temperature reached and for how long (minutes) the
temperature 1 was over ALo or AHi, then “AL2”, min/max alarm … . AL1 is referred to the most recent event. AL is the oldest.
When the RC is showing the Haccp data, pressing the “Function” key for 5 seconds will erase the alarm data stored (it will show “---“).
The controller will show only data for alarms of events which have come back to normal. If an alarm is running, it could be ended decreasing the ALo
or increasing the AHi value. At the end of an alarm the RC stores the Haccp data in its memory.
During the defrost actions there is no alarm recording. RC doesn’t have a battery inside, if power fails occurs it does not check/record any data.
Changing the temperature measure unit (“unt” param.), the logged temperatures / parameters values reflect unit set in the past (not convert).
2.00 TECHNICAL SPECIFICATIONS
POWER : 2 0 Vac ±10% 50/60 Hz ( VA max);
SUPPLY or 115 Vac ±10% 50/60 Hz ( VA max);
or 12 Vac/dc ±10% (150mA max) (use only SELV power s.);
or 9..24 Vac/dc (use only SELV power supply).
INPUTS: 2 Ntc/Ptc sensors, 1 Digital-In external contact (max 1mA);
Probes types: Ntc standard 10Kohm@25°C Beta= 4 5-25/85;
Ntc 5Kohm@25°C Beta= 980-25/100;
Ptc 990ohm@25°C KTY81(2)-121.
OUTPUTS: 1 spst relay 250Vac 12A max resistive (compressor);
1 spst relay 250Vac 5A max resistive (fan);
1 spdt relay 250Vac 8A max resistive (defrost).
(the ma const. current in the common terminal #1 is 12A)
SERIAL PORT: TTL leve
l, ModBus protocol, RTU type, 9600 baud,
8bit char, even parity, 1 bit stop;
DISPLAY: digit LED, 14 mm height, high intensity red;
MEASURING RANGE: -50 … +150 °C / -50 ... + 02 °F (if Ptc);
- resolution: 0.1 °C / 0.1 °F (within –19.9 .. +99.9);
- accuracy @25°C: ±0.5 °C + 1 digit;
- connections terminal block with screw for max 2.5mm2 gauge wire;
- operating temperature: –10 … +60 °C;
- storage temperature: –25 … +70 °C;
- storage humidity: 0 … 90 % r.H., non condensing;
- plastic casing (PC+ABS rear box, PC frontal panel);
- frontal panel IP65, if appropriate mounting gasket;
- max temperature of the switch head: 60 °C;
- pollution degree: 2;
- rated impulse voltage: 2.5 KV;
- PTI of insulating material: 175 (circuit board 250);
- class of protection against electric shock: II (for correct install.);
- class of protection against voltage sourges: category II;
- type of disconnection: 1.B micro disconnection (relay);
- software class: A.
Typical terminal connections (See the label on top of the instrument
for the right power supply diagram connection).
4.10 COMPRESSOR parameters
Param.
code Description Range Default
SEt Set point: it is the desired temperature of the cold room. SLo .. SHi °C -5 °C
St2 Secondary set point. Useful for the external contact function: When Eio=± , switching an external contact, it is possible to
change the active Set point value between SEt and St2. SLo .. SHi °C -2 °C
SHy Set point Hysteresis (e HyS). Delta temperature value to avoid regulating oscillations.
The compressor switches off at SEt and switches on at SEt+SHy value (ref. temperature probe 1). 0.1 .. 20 °C 2 °C
SLo Low Set Point limit (e LoS). It is the min value of SEt parameter range. The user cannot select a SEt value lower than SLo. -50 .. SHi °C -40 °C
SHi High Set Point limit (e HiS). It is the max value of SEt parameter range. The user cannot select a SEt value higher than SHi. SLo .. 150 °C 110 °C
rA1 Anticycle retard (e Acy). When the compressor output is switched-off, the controller waits at least rA1 minutes to switch on
again the relay. It is also the delay for the first activation of the compressor relay at power on. 0 .. 20 minutes 0 m
ro1
Retard to switch on the compressor. It is the delay to switch on the compressor relay from the request to activate it.
When the cold room temperature requires to activate the compressor output, the software starts to waiting ro1 minutes before
switching on the output relay. This delay is not considered when PF1. After defrost, compressor waits also ro1 (see also dAd).
0 .. 20 minutes 0 m
PEc
Probe 1 error, compressor mode (e CPF). If there is a probe 1 fault (temperature out of range, shortcircuit or probe
disconnected, RC measur.circuit fault) the RC starts to manage the compressor relay by time and shows PF1 on display.
0: compressor always off; 1: compressor always on; 2: compressor on for PE1 minutes and off for PE0 minutes.
0 .. 2 2
PE1 Probe 1 error, compressor on (e Con). The time to switch on the compressor relay when there is a PF1 error (if PEc=2). 0 .. 45 minutes 15 m
PE0 Probe 1 error, compressor off (e Cof). The time to switch off the compressor relay when there is a PF1 error (if PEc=2). 0 .. 45 minutes 0 m
SEt+SHy
on
temperature probe 1
SEt
off
Compressor
output
off
on
rA1
ro1
Compressor
output
time
rA1
ro1
4.20 ALARM parameters
The temperature alarm events are always linked to the probe 1 (cold room temperature). The alarm hysteresis is 0,4 °C fixed.
Param.
code Description Range Default
AtP Alarm type values.
0: ALo, AHi are absolute temperature values; 1: ALo, AHi are temperature values relating to the SEt value. 0 .. 1 0
ALo Low temperature threshold alarm (e LoA). If the temperature goes below this value (ALo-0,4), the controller activates an
alarm signal on the display and starts recording the minimum temperature and the duration of the alarm (Haccp).
AtP=0, –50..(AHi-1)
AtP=1, -50 .. –0.5 -40 °C
AHi High temperature threshold alarm (e HiA). If the cold room temperature goes up over this limit value (AHi+0,4), the controller
activates an alarm signal on the display and starts to record the max temperature and the time duration of the alarm signal.
AtP=0, (ALo+1)..150
AtP=1, 0.5 .. 150 110 °C
Adi Alarm delay at the power on. The RC does not check any temperature alarm for Adi hours from the power on. 0 .. 10 hours 0 h
ALd Alarm delay on running time. The temperature must be in the alarm range for ALd minutes to switch on the alarm signal. 0 .. 120 minutes 0 m
AdF Alarm delay after defrost. After the end of any defrost, the RC waits AdF minutes before checking any temp. alarm. 0 .. 180 minutes 0 m
Ad0 Alarm delay after de-activation of the external contact (digital input).
I.e.: after closing the room door, the RC waits Ad0 minutes before checking the temperature for alarm. 0 .. 240 minutes 0 m
Ad1 Alarm delay from the activation of the external contact. The delay count starts immediately without waiting Eid.
I.e.: after opening the room door, the RC waits Ad1 minutes before checking the temperature for alarm 0 .. 120 minutes 0 m
Note: The alarm signal management is disabled during the defrost actions (no star, nor stop alarm).
When AtP=1, ALo & AHi are always referred to the SEt value, also if St2
is activated by an e ternal input
.
4.30 DEFROST parameters
Param.
code Description Range Default
dPt Defrost time period. It is the period of time between two defrost actions. 1 .. 240 (dtS) 6 h
ddt Defrost duration timeout. It is the max duration of each defrost action. If ddt=0 the defrost function is disabled. 0 .. 240 (dtS) 0 m
dtS Defrost time scale (e tiS). It changes the time scale of dPt and ddt.
0: dPt hours, ddt minutes; 1: dPt minutes, ddt seconds; 0 .. 1 0
dEt
Defrost end temperature. During the defrost action, the controller checks the temperature 2 (evaporator). When the evaporator
reaches the dEt value, the controller stops the defrost action (and, if deo>0, it starts defrost optimization). From any start of the
defrost action, the controller stops the defrost after ddt time, even if temperature 2 is less than dEt (timeout end).
-20 .. 100 °C 7 °C
dEo
Defrost end optimization. As the evaporator temperature reaches the dEt value, the RC starts to control the evaporator
temperature between dEt and (dEt-2), for dEo minutes. It improves the de-iceing process, keeping a lower evaporator
temperature and avoids an excessive warming of the evaporator area. If dEo=0, the defrost optimization function is disabled.
If dtP=0, it switches on/off the heater relay; if dtP=1, it keeps on the valve output relay and switches on/off the compressor.
When dtP=1 (defrost by hot gas) the dEo function must be disabled (dEo=0), to avoid any excessive stress to the evaporator.
0 .. 60 minutes 10 m
dtP
Defrost type (e odd): by electrical heater or by hot-gas.
0: by electrical heater. The defrost is performed by stopping the compressor, switch on the defrost output to power on heater;
1: by hot gas. Switch on the compressor output and also the defrost output to activate the turning valve.
0 .. 1 0
dSd
Defrost start delay. It is a delay between the time to start of the defrost action and its real beginning (switch on of the output
relays). At the power on of the controller, it starts the first defrost action after dPt hours + dSd minutes (and the sucessive
starts after dPt). If an external contact activates the defrost action (if Eio=±4), it starts after dSd minutes.
0 .. 120 minutes 0 m
dAd Delay to switch on the compressor after a defrost end (e Add). Dripping Time. After a defrost cycle, the compressor is
stopped to assure dripping of possible water still present in the evaporator. 0 .. 120 minutes 0 m
ddd
Displayed during the defrost action.
0: probe 1 temperature at the defrost start; 1: the message “dEF”; 2: the SEt value; : the real temperature of probe 1.
When 0, 1, 2, the value will be shown on the display until the controller will have reached again the Set Point value.
0 .. 0
WARNING:
during the
installation, take care to set
proper rA1
value to avoid
compressor or relay faults.
63,5 6,8
28,5
TTLserial
port
34,5
( 34,5 x 76 mm )
( 63,5 x 70 mm)
Fan
K1 = SPST 12A 250Vac max resistive
K2 = SPDT 8A 250Vac max resistive
K = SPST 5A 250Vac max resistive
K2 K K1
RC 33
Comp.
Defrost
c
o
n
s
t
a
n
t
m
a
x
1
2
A
room
evaporator
1 2
digitalinput
temperature
probes
T
T
L
p
o
r
t