Multifunctional digital thermostat temperature controller1

Response time:less than 0.5s

Multifunctional digital thermostat temperature controller made in China

1. Product Highlights

Thermocouple: T, R, J, B, S, K, E, Wre3-Wre25.

Thermo Resistor: Pt100, Cu50.

1 Relay output, 1 SSR controlled output.

Time proportional PID controlled output to either Relay or SSR

Three built-in algorithms that fit most control objects and various applications.

Temperature can be set to display in either Fahrenheit or Celsius degrees.

2. Specifications

Supply voltage: 12V AC or DC

Power consumption: < 2 Watts.

Sampling speed: 4/sec.

SSR activated voltage: open circuit: 10V; short circuit: 40mA.

Accuracy: 0.2% of full scale.

LED Display: Red, 0.28 inch

Out of range indication: EEEE.

Ambient temperature requirements: 0 to 50 C (32 to 122 F)

Humidity requirement: < 85% RH.

Relay Contact: 220VAC, 3A.

Controller dimensions: 48 x 24 x 75 (mm).

Opening for installation: 44 x 20 (mm)

3. Panel Illustration and Description

Figure 2

1 -- AL, Relay J1 Indicator.

2 -- Select next parameter / value increment.

3 -- Selection previous parameter / value decrement.

4 -- Digit select / Auto tuning.

5 -- Setting / Confirm.

6 -- Output, controlled output indicator. (AT) Blinking during auto-tuning process.

7 Temperature reading, degrees F or degrees C (as chosen)

4. Parameter Setting

a) Press (SET) to enter setting mode.

b) Press (>), (v) and/or (^) to enter and select parameters.

c) Press (SET) again to confirm entry or selection.

i.) To enter initialization parameter setting mode press (SET), then enter code 0089, press

(SET) again.

Table 1 - Initialization Parameters

Table 2 - Temperature Sensor T ype

Note 1:

0: Relay J1 Alarm output; SSR Disabled, normally used for upper lower limit alarm trigger control.

1: Relay J1 PID controlled output: SSR Disabled. Contact controlled output.

2: Relay J1 as alarm output; SSR PID controlled 12 Volt output. No Contact controlled output.

Note 2:

This controller has 3 types of auto-tuning control methods already built-in:

0: Universal PID control suitable for increase/decrease fast speed of change of temperature

application.

1: Gradual change PID control is suitable for applications that require steady change of

temperature and speed of temperature change is not critical.

2: Fuzzy logic control suitable for system with oscillation and sensing signal delay.

Figure 3

ii.) To enter the PID parameter setting mode, press (SET), then enter code 0036, press (SET)

again.

Table 3 - PID and Relevant Parameters:

P, I, and d parameters control the accuracy and response time of the temperature controller. Autotuning

is recommended for users who are not familiar with PID control theory. P, I and d values

should only be adjusted by professionals.

Note 4

Proportional Band (P): When P increases, fluctuation of object being controlled decreases. When P

decreases, fluctuation of object being controlled increases. When P value is too small, system may

become non-converge.

Note 5

Integration time (I): its purpose is to reduce static error. When I decrease, respond speed is faster but

system is less stable. When I increase, response speed is slower, but system is more stable.

Note 6

Differentiation time (d): its purpose is to control in advance and compensate delay. Setting d-value

too small or too large would decrease system stability, oscillation or even non-converge.

Note 7

Integration control range (SF): It defines integration range limits. When |SV-PV|

control is activated.

Note 8

Full power/complete off range (bb): It defines temperature range limits that the heating/cooling

element is either fully on or fully off. When |SV-PV|>bb, heating/cooling element could be either full

power heating or complete not power.

Note 9

Control Period (ot): As ot is set lower, the heating/cooling cycle is driven faster, and thus system

responce speed is faster. When using contact control (Relay), the mechanical contacts will wear out

faster.

When contact control (Relay) is used, normally set ot = 5~30.

When non-contact control (SSR) is used, normally set ot = 2.

Note 10

Digital Filtering (Filt): Filt=0, filter disabled; Filt=1, weak filtering effect; Filt=3, strongest filtering

effect; Stronger the filtering, more stable the readout, but has more readout display delay.

iii.) To enter temperature and alarm parameter setting mode, press (SET), then enter code

0001, press (SET) a gain.

Table 4 - Temperature Setting and Alarm Related Parameters:

Figure 4 Figure 5

iv.) During Normal Operation mode, pressing (^) or (v), the display will show SV.

Pressing (^) or (v) again would increase or decrease SV by 1 degree.

a) Set AH1 = AL1, relay is disabled.

b) Set AH1 > AL1: Normally used for upper limit alarm trigger. See Figure 4.

c) Set AH1 < AL1: Normally used for lower limure 5.

5. Auto-Tuning

By simply pressing a single button, the built-in artificial intelligent is activated to automatically

calculate and set parameters ( P, I, d, SF, Bb, Ot ) that fit the condition to be controlled.

Figure 6

a) How to start and stop the auto-tuning process:

i. To activate auto-tuning, press and hold (>) until AT indicator blinks, which indicates autotuning

is in progress. When auto-tuning finishes, the AT indicator light turns off. Now newly

calculated PID parameters are stored in memory and will be used by the controller.

ii. To EXIT during the auto-tuning process, press and hold (>) until AT indicator turns off.

The previously entered PID parameters values are used by the controller.

Connection Terminals (back view).

Note that the polarity of power at terminals 1 and 2 does not matter.