LILYTECH ZL-7817A PID Temperature Controller User Manual

1. Introduction

The LILYTECH ZL-7817A is a high-precision PID temperature controller thermostat designed for industrial applications. It features an integrated Solid State Relay (SSR) with a 5A power driving ability and offers an auxiliary output for timer on/off functions or high-temperature protection. The controller boasts an internal control resolution of 0.01°C, providing precise feedback for temperature regulation.

2. Safety Information and Precautions

Please read and understand the following safety guidelines before installation and operation to prevent damage to the device or injury.

• Wiring: All wiring work must be performed by certified technicians. Incorrect wiring can damage the controller and connected loads.
• Sensor Wiring: Sensor input signal wires should not be put together with power supply wire, and even in the same pipe, to avoid electrical noise interference. Keep sensor wires as short as possible.
• Load Compatibility: Ensure that connected loads are within the specified output driving ability of the controller.
• AC/DC Module Loads: If using an AC/DC module as a load, the rated current should not exceed 1/10th of the output specification under pure resistance.
• Tungsten Lamp Loads: For tungsten lamp loads, the rated current should not exceed 1/15th of the output specification under pure resistance.
• Motor Loads: For motor loads, the rated current should not exceed 1/5th of the output specification under pure resistance.
• Internal Components: Do not touch internal components of the controller.
• Environmental Conditions: Avoid installing the controller in environments with:
  • Humidity greater than 90% RH, or conditions where dew can easily form.
  • Excessive vibration or shock.
  • Exposure to sprayed liquids, erosive air, or explosive air.

3. Installation and Wiring

3.1 Physical Installation

The controller is designed for panel mounting. Ensure adequate space for ventilation and wiring.

• Installation Drilling Dimensions: W71 x H29 (mm)
• Overall Dimensions: 78 x 34.5 x 71 (mm)

Refer to Figure 2 for detailed installation steps and wiring connections.

3.2 Electrical Wiring

Carefully follow the wiring diagram provided in Figure 2. Ensure all connections are secure and correct before applying power.

• Power Supply: Connect 100-240Vac, 50/60Hz to the designated terminals (5 and 6).
• Output R1 (Heating Output): Connect your heating element to terminals 1 and 2. Rated for 5A, 250Vac.
• Output R2 (Timer Output): Connect your auxiliary device to terminals 3 and 4. Rated for 7A, 250Vac (resistive).
• Sensor: Connect the NTC temperature sensor to terminals 7 and 8.
• Alarm Input: Connect external alarm input to terminal 9.

Wiring Diagram Key:

• 1, 2: R1 Heating Output 5A/250V~ (rated)
• 3, 4: R2 Timer Output 7A/250V~ (resistive)
• 5, 6: Power Supply AC100-240V
• 7, 8: Temp. Sensor
• 9: Alarm Input

4. Operating Instructions

4.1 Display Overview

The controller features a digital display and several indicators. Refer to the table below for display functions.

Display Table (refer to Figure 3 for visual representation):

4.2 Setting the Set-point (SP)

The factory default set-point is 35.0°C.

1. Press and hold the P button for 3 seconds to enter the temperature setting status. The display will blink.
2. Use the ▲ (Up) or ▼ (Down) buttons to adjust the desired set-point value.
3. Press the S button to save the new set-point and exit the setting status.
4. If no button is pressed for 30 seconds, the controller will automatically save the current value and exit the setting status.

4.3 PID Parameters Auto Tuning (AT)

Auto-tuning helps the controller find optimal PID parameters for your specific system, improving control accuracy.

1. Set the driving power rate (U73, percent of full heater power rate). If unsure, proceed to step 4.
2. Set your desired Set-point (SP).
3. While in normal control status (not setting status), press and hold both ▲ and ▼ buttons simultaneously for 5 seconds to enter auto-tuning mode. The U73 value will display, and the ☀ (sun icon) will blink.
4. Use the ▲ and ▼ buttons to adjust the amplitude value (U73).
5. Press the P button to start auto-tuning.

During auto-tuning, the measured temperature will rise and fluctuate around the set-point several times.

• If the ☀ icon disappears and "At1", "At2", or "At3" displays, auto-tuning has failed.
• If "SUC" displays, auto-tuning is successfully finished, and the PID parameters are saved.
• After successful tuning, press any button to clear the "AT1/2/3, SUC" message and resume normal temperature control.
• If the ☀ icon never disappears, it might indicate a lower power rate. Increase the U73 value and try tuning again.

Note on PID vs. Hysteresis Control: For simpler systems, hysteresis control (U74 = 1) might be sufficient. If the temperature overshoot is consistently within ±0.2°C of the SP, PID auto-tuning might not be necessary or effective.

4.4 Manual Tuning Principle

Manual tuning allows fine-tuning of control results. Adjusting PID parameters (Kp, Ti, Td) impacts control speed, accuracy, and stability:

• Increase Kp (U70): Increases control speed but may lead to more overshoot and larger temperature oscillations.
• Increase Ti (U71): Improves temperature accuracy but may require a longer time to reach the set-point after heating starts.
• Increase Td (U72): Provides faster reaction to temperature changes but may introduce more "small noise" or instability into the control result.

5. Maintenance

The LILYTECH ZL-7817A is designed for reliable operation with minimal maintenance. Adhering to the installation guidelines and environmental conditions mentioned in the Safety Information section will ensure longevity.

• Cleaning: Keep the controller's display and buttons clean. Use a soft, dry cloth for cleaning. Do not use abrasive cleaners or solvents.
• Inspection: Periodically check wiring connections for tightness and signs of wear or damage.
• Internal Access: Do not open the controller or touch internal components unless you are a qualified technician. There are no user-serviceable parts inside.

6. Troubleshooting

This section provides guidance for common issues and warnings.

6.1 Warning Indicators and Alarms

• Over Temperature Protection: If protection (U46 = 1 or 2) is enabled and the measured temperature reaches or exceeds the high temperature warning point (SP + U13), output R2 will be energized.
• Over Temperature Warning: If the measured temperature reaches or exceeds the high temperature warning point (SP + U12), the display will blink, and the buzzer will beep.
• Low Temperature Warning: If the measured temperature falls to or below the low temperature warning point (SP - U12), the display will blink, and the buzzer will beep.
• External Input Warning (U60):
  • U60 = 0: External input warning function is disabled.
  • U60 = 1 (Normal Open): When the external input is closed, a warning occurs, R1 de-energizes, R2 remains active.
  • U60 = 2 (Normal Close): When the external input is open, a warning occurs, R1 de-energizes, R2 remains active.
• Buzzer Warning: The buzzer will sound during failures or warnings. Press the P button to silence the buzzer. It will stop beeping automatically once the failure or warning condition clears.

6.2 Sensor Issues

• Sensor Failure (E1): If the sensor fails (open or short circuit), the display will blink, a warning will be indicated, and output R1 will de-energize while R2 remains active.
• Sensing Accuracy: The sensor has a resolution of 0.1°C. After calibration (U30), the absolute sensing accuracy can be 0.1°C.

6.3 Restoring Factory Settings

To restore all system parameters to their factory default settings:

1. Press and hold both the P and ▲ buttons simultaneously for 5 seconds. The display will show "UnL".
2. Press the ▼ button twice to confirm the restoration. All system parameters will revert to factory defaults.

7. Specifications

8. User Tips

• Temperature Range Verification: Always verify that the controller's operating temperature range (-40.0°C to 130.0°C) and maximum measuring temperature (100°C - 119°C) are suitable for your specific application, especially if extremely low temperatures are required. The controller is not designed for temperatures below -40.0°C.
• PID vs. Hysteresis: For applications where precise temperature control is not critical or where the system inherently has low thermal inertia, consider using hysteresis control (U74=1) instead of PID to simplify setup and potentially avoid complex tuning.
• Power Rate for Auto-Tuning: If auto-tuning fails repeatedly, ensure that the driving power rate (U73) is set appropriately for your heater. A too-low power rate can prevent the system from reaching stable oscillation for tuning.

9. Warranty and Support

For warranty information, technical support, or service inquiries, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.