ELECTRONIC THERMOSTAT
N322
OPERATING MANUAL - V1.7x
The N322 is a 2-output di ital electronic thermostat for heatin and coolin
applications. It is available with NTC thermistor input sensor, Pt100, Pt1000 or
J/K/T type thermocouple. Sensor offset correction is provided. The 2 independent
outputs can be used as control or alarm. The features of a particular model (input
sensor type, sensor ran e, mains supply, etc) are identified by the label placed on
the thermostat body.
SPECIFICATIONS
INPUT SENSOR: The input sensor type can be chosen form the options below
(specified when placin the order):
NTC Thermistor, 10 kΩ
ΩΩ
Ω @ 25 °C; ran e: –50 to 120 °C (-58 to 248 °F);
Accuracy: 1,0 °C (1,1 °F), with ori inal sensor;
Sensor interchan eability: 1 °C (1.35 °F). This error can be compensated by
the offset parameter in the thermostat.
Pt100 (α
αα
α= 385); Ran e: –50 to 300 °C (-58 to 572 °F);
Accuracy: 0,7 °C (1.3 °F); IEC-751.
Pt1000 (α
αα
α= 385); Ran e: –200 to 530 °C (-328 to 986 °F); Accuracy: 0,7 °C (1.3° F);
J, K or T t ermocouple (IEC-584):
Type J: Ran e: 0 to 600 °C (32 to 1112 °F); Accuracy: 3 °C (5.4 °F);
Type K: Ran e: -50 to 1000 °C (-58 to 1832 °F); Accuracy: 3 °C (5.4 °F);
Type T: Ran e: -50 to 400 °C (-58 to 752 °F); Accuracy: 3 °C (5.4 °F);
Note: In the thermostat with NTC input, a 3 m-sensor cable is bundled with the
instrument. The cable can be extended up to 200 m.
WARM-UP:............................................................................................15 minutes
MEASUREMENT RESOLUTION:
from –19.9 to 199.9º With NTC, Pt100 and Pt1000:............................................0.1
elsewhere: .........................................................................................................1
OUTPUT1:........... Relay SPDT; 1 HP 250 Vac / 1/3 HP 125 Vac (10 A Resistive)
OUTPUT2:................................................................... Relay: 3A / 250 Vac, SPST
POWER SUPPLY: ..............100~240 Vac (± 10 %) or 24 Vdc/ac (12~30 Vdc/ac)
........................................ Mains frequency: 50~60 Hz. Power consumption: 5 VA
Caution: check the power supply specification before ener izin the thermostat.
DIMENSIONS:.......................................Width x Hei ht x Depth: 74 x 32 x 75 mm
..............................................................Panel cut-out: 70 x 29 mm; Wei ht: 100
ENVIRONMENT:......................Operatin temperature: 0 to 40 °C (32 to 122 °F)
....................................................Stora e temperature: -20 to 60 °C(-4 to 140 °F)
.......................................................Relative humidity: 20 to 85 % non condensin
CASE:............Polycarbonate UL94 V-2; Protection: Front panel: IP65, Box: IP42
................................................................................ Suitable wirin : Up to 4,0 mm²
RS-485 digital communication; RTU MODBUS protocol (optional)
ELECTRICAL WIRING
It is important to follow the recommendations below:
• Si nal wires should be installed in rounded conduits and away from power or
contactor wires.
• The instrument should have its own power supply wires that should not be
shared with electrical motors, coils, contactors, etc.
• Installin RC filters (47 R and 100 nF, series combination) is stron ly
recommended at contactor coils or any other inductors.
Fi ure 1 below shows the thermostat connections to sensor, mains and outputs.
Fi ure 1 – N322 terminals
Pt100 wit 3 conductors: Terminals 11, 12 and 13 must have the same wire
resistance for proper cable len th compensation. For 2 wire Pt100, short circuit
terminals 11 and 13.
OPERATION
The thermostat requires the internal parameters to be confi ured accordin to the
intended use for the instrument The parameters are or anized in 4 roups or
levels:
Level Function
0 Temperature measurement
1 Setpoint Adjustment
2 Confi uration
3 Calibration
Upon power-up, the N322 display shows for 1 second its firmware version. This
information is useful when consultin the factory.
Then, the temperature measured by the sensor is shown on the display. This is
the parameter level 0 (temperature measurement level).
To access level 1, press for 1 second until the “SP1
SP1SP1
SP1” messa e shows up.
Pressin a ain, the “SP2
SP2SP2
SP2” parameter is presented. To o back to level 0,
press once more.
To access level 2 of paramenters, press for 2 seconds until the “uNT
uNTuNT
uNT”
messa e is shown. Release the key to remain in this level. Each new
pressin on the key will advance to the next parameter in the level. At the end
of the level, the thermostat returns to the first level (0). Use the and keys
to alter a parameter value.
Notes: 1 A parameter confi uration is saved when the key is pressed to
advance to the next parameter in the cycle. The confi uration is
stored in a non-volatile memory, retainin its value when the
thermostat is de-ener ized.
2If no keyboard activity is detected for over 20 seconds, the thermostat
saves the current parameter value and returns to the measurement
level.
Level 1 –Setpoint Adjustment
In this level only the Setpoint (SP1
SP1 SP1
SP1 and SP2
SP2SP2
SP2) parameters are available,
alternatin the names with their respective values. Adjust the desired temperature
for each setpoint clickin on the and keys.
SP1
SP1SP1
SP1
Set Point 1
Temperature adjustment for control OUTPUT 1. SP1
SP1SP1
SP1 value is
limited to the values pro rammed in SPL
SPLSPL
SPL and SPk
SPk SPk
SPk in the
pro rammin level (Parameter confi uration, level 2).
SP2
SP2SP2
SP2
Set Point 2
Temperature adjustment for control OUTPUT 1. SP2
SP2SP2
SP2 value is
limited to the values pro rammed in SPL
SPLSPL
SPL and SPk
SPk SPk
SPk
Level 2 – Configuration - Parameters configuration Level
Contains the confi uration parameters to be defined by the user, accordin to the
system’s requirements. Use and keys to set the value. The display
alternates the parameter name and respective value.
Unt
UntUnt
Unt
Temperature Unit - Selects display indication for de rees
Celsius or Fahrenheit.
0
00
0 - Temperatura em raus Celsius
1
11
1 - Temperatura em raus Fahrenheit
typ
typtyp
typ
Input Type - Selects the input sensor type to be connected to the
controller. Available only for thermocouple models, allowin
selection of types J, K and T.
0
00
0 - Thermocouple type J
1
11
1 - Thermocouple type K
2
22
2 - Thermocouple type T
ofs
ofsofs
ofs
Sensor Offset - Offset value to be added to the measured
temperature to compensate sensor error.
spl
splspl
spl
SP Low Limit - Lower ran e for SP1
SP1 SP1
SP1 and SP2
SP2SP2
SP2. SPL
SPL SPL
SPL must be
pro rammed with a lower value than spK
spKspK
spK.
spK
spKspK
spK
SP Hig Limit - Upper ran e for SP1
SP1 SP1
SP1 and SP2
SP2SP2
SP2. SPx
SPx SPx
SPx must be
reater than spl
splspl
spl.
ky1
ky1ky1
ky1
OUTPUT 1 Hysteresis: defines the differential ran e between
the temperature value at which the OUTPUT 1 is turned on and
the value at which it is turned off. In de rees.
ky2
ky2ky2
ky2
OUTPUT 2 Hysteresis: defines the differential ran e between
the temperature value at which the OUTPUT 2 is turned on and
the value at which it is turned off. In de rees.
Ac1
Ac1Ac1
Ac1
Control action for OUTPUT 1 :
0
00
0 Reverse: For heatin applications. Outputs turn on when
temperature is lower than SP.
1
11
1 Direct: For coolin applications. Output turns on when
temperature is above SP.
Ac2
Ac2Ac2
Ac2
Action 2 - Control OUTPUT 2 action or Alarm funtions:
0
00
0 Reverse control action (heatin ).
1
11
1Direct control action (coolin ).
2
22
2Low (minimum) temperature alarm.
3
33
3Hi h (maximum) temperature alarm.
4
44
4Alarm for temperature inside the ran e
5
55
5Alarm for temperature outside the ran e.
6
66
6Low temperature alarm with initial blockin .
7
77
7Hi h temperature alarm with initial blockin .
8
88
8Inside ran e alarm with initial blockin .
9
99
9Outside ran e alarm with initial blockin .
The section Working wit t e T ermostat describes how these
functions work.
nt
ntnt
nt
Control
Control - Associates Setpoints and Outputs.
0
00
0 Setpoint 1 is assi ned to OUTPUT1 and Setpoint 2 to
OUTPUT2 (factory settin ).
1
11
1 Setpoint 1 is assi ned to OUTPUT2 where as Setpoint 2 is
directed to OUTPUT1.
