Inovance H0U-88B1G User Manual (English)

Questions and Answers:

W
Wendy LeeAug 17, 2025
Why is my Inovance Controller reporting an over current fault during operation?
- E
  Elizabeth SmithAug 17, 2025
  An over current fault during operation may occur because the inverter's acceleration time is not set properly, or the PID parameters (Kp and Ti) are causing rapid speed regulation. To resolve this: increase the 'Acceleration time' (longer times for bigger power applications), properly decrease Kp (less than 2.0), and properly increase Ti (between 1.0 and 2.0 seconds).
G
grimesangelaAug 19, 2025
What to do if my Inovance H0U-88B1G shows an inverter communication failure prompt?
- J
  jonesjamesAug 19, 2025
  An inverter communication failure prompt may appear if the communication cable between the controller and MD320 is loose or disconnected, or if the inverter communication function codes are set incorrectly. Check the connection at both ends of the cable. Also, verify the inverter's FD function codes: FD-00=5, FD-01=0, FD-02=1, and FD-05=0.
J
Jillian AtkinsAug 22, 2025
How to stabilize the air outlet pressure on my Inovance H0U-88B1G?
- I
  Isaac RogersAug 22, 2025
  Unstable air outlet pressure can be caused by improper settings of the pressure PID parameters Kp and Ti. Properly decrease Kp (less than 2.0) and properly increase Ti (between 1.0 and 2.0 seconds) to stabilize the pressure.
S
Sheri JacksonAug 25, 2025
What should I do if my Inovance H0U-88B1G displays a fan inverter communication failure prompt?
- L
  Laura ButlerAug 26, 2025
  A fan inverter communication failure prompt can occur if the communication cable between the controller and MD320 is not connected properly or becomes loose, or if the function codes related to inverter communication are set incorrectly. Ensure the cable is securely connected at both ends. Then, check the FD function codes of the inverter, they should be: FD-00=5; FD-01=0; FD-02=2; FD-05=0.
M
Maxwell Woods IIAug 27, 2025
Why does the intake valve on my Inovance H0U-88B1G frequently turn on and off?
- R
  Roger BurnsAug 27, 2025
  Frequent turning on and off of the intake valve can occur if the 'Upper limit of intake pressure' is too close to the preset pressure, or if the PID parameter setting is too sensitive. To resolve this, properly increase the 'Upper limit of intake pressure', or properly decrease the Kp value.
K
Karla MartinezAug 30, 2025
Why won't my Inovance H0U-88B1G's screw compressor start?
- K
  Kristen JohnsonAug 30, 2025
  The screw compressor might not start if the emergency stop button is not released, or due to voltage and phase issues. Check whether terminal X0 in 'Actually measured parameter' is in close loop status. If it's a voltage and phase issue, adjust the phase.
K
Kathy GomezSep 2, 2025
What does Err16 fault mean on my Inovance H0U-88B1G Controller's inverter?
- F
  Francisco PerkinsSep 2, 2025
  The Err16 fault indicates abnormal communication between the inverter and the controller, that the controller is powered down, or that the controller itself is abnormal. Check the function codes and the connection of the RS485 communication cable. If the system is in power-line drive mode and the inverter doesn't need to run, the fault is normal.
E
Elizabeth PetersonSep 5, 2025
What does Err15 fault mean on my Inovance Controller's inverter?
- T
  Teresa JonesSep 5, 2025
  The Err15 fault indicates that the DI1/COM terminal of the inverter is not connected to the emergency stop switch point, or the emergency stop switch point has been pressed. Ensure that the DI1/COM terminal of the inverter is not connected to the emergency stop switch point. If the switch point has been pressed, the fault is normal.
D
Daniel BrownSep 8, 2025
What causes over current in power-line drive mode on my Inovance H0U-88B1G Controller?
- S
  Samuel HillSep 8, 2025
  Over current in power-line drive mode can be caused by an inaccurate transformation ratio setting of CT1 or an inaccurate main motor rated current setting. To solve this, ensure that 'Protection current' is greater than 'rated current'.
W
William ParkSep 10, 2025
Why doesn't the screw compressor on my Inovance H0U-88B1G Controller enter sleep mode, or why does it frequently sleep and awake?
- R
  Ryan CollierSep 12, 2025
  If the screw compressor doesn't enter sleep mode or frequently sleeps and awakes, it might be because the 'Sleep mode awaking pressure' is too close to the preset pressure. To fix this, properly decrease the 'Sleep mode awaking pressure'.

Inovance H0U-88B1G Specifications

General

Series	H0U
Power Supply	24 VDC
Input Voltage	24 VDC
Output Voltage	24 VDC
Type	PLC
Output Current	0.5A per point
Humidity	5% to 95% (non-condensing)

Summary

Chapter 1 Preface

Chapter 2 Functions and Configuration

2.1 Function Overview

Details the supported applications and features of the H0U-88B1G controller with ACC program.

2.2 Hardware Configuration

Describes the controller's terminal types, attributes, functions, and remarks.

Chapter 3 Mounting and Wiring

3.1 Controller Wiring

Explains the connection of the HOU-88B1G controller to the MD 320 Series inverter using RS485.

3.2 Screw Compressor Drive Modes

Lists the various drive modes supported by the H0U-88B1G controller for screw compressors.

3.3 Controller Terminal Diagram

Provides a detailed diagram of the HOU-88B1G controller's wiring terminals and connections.

3.4 Dimension and Installation

Details the physical dimensions and mounting hole specifications for controller installation.

3.5 Arrangement 1: Motor/Fan Power-Line Drive

Illustrates the power wiring for Arrangement 1 where both motor and fan use power-line drive.

3.6 Arrangement 1: Signal Wiring

Shows the controlling signal wiring diagram for Arrangement 1 with power-line driven motor and fan.

3.7 Arrangement 2: Power Wiring

Depicts the power wiring diagram for Arrangement 2: Main Motor by MDI, Fan by Power-line.

3.8 Arrangement 2: Signal Wiring

Illustrates the controlling signal wiring for Arrangement 2: Main Motor by MDI, Fan by Power-line.

3.9 Arrangement 3: Power Wiring

Details the power wiring diagram for Arrangement 3: Both Main Motor and Fan Driven by MDI.

3.10 Arrangement 3: Signal Wiring

Shows the controlling signal wiring diagram for Arrangement 3 where both motor and fan are driven by MDIs.

3.11 Arrangement 4: Power Wiring

Presents the power wiring diagram for Arrangement 4: Main Motor MDI/Power-line Compatible, Fan Power-line.

3.12 Arrangement 4: Signal Wiring

Illustrates the controlling signal wiring for Arrangement 4: Main Motor MDI/Power-line, Fan Power-line.

3.13 Arrangement 5: Power Wiring

Details the power wiring diagram for Arrangement 5: Main Motor MDI/Power-line, Fan Power-line.

3.14 Arrangement 5: Signal Wiring

Shows the controlling signal wiring diagram for Arrangement 5: Both motor and fan adopt MDI/Power-line compatible drive.

Chapter 4 Description on How to Operate the Controller

4.1 Controller Key Functions

Explains the functions and operation of the 8 keys on the controller panel.

4.2 Controller Display Screens

Describes the welcome and default screens displayed by the controller after power-on.

4.3 Menu Item List

Lists the main menu items accessible from the controller's default screen.

4.4 Controller Access Authority

Details the 3-level authority management system for accessing controller functions and parameters.

4.5 Function Parameter Settings

Explains how to set function parameters, requiring appropriate authority levels.

4.6 Data Backup and Management

Covers the controller's features for backing up and managing settings, including user and factory data.

4.7 Alarm Information Handling

Guides on how to view, silence, and clear alarm and maintenance prompt information.

Chapter 5 Operating the Screw Compressor

5.1 Operation Precautions

Provides essential notes and safety precautions before operating the screw compressor.

5.2 MDI Drive Mode Operation

Details the procedure for starting and stopping the screw compressor when operating in MDI drive mode.

5.3 Power-line Drive Mode Operation

Explains how to operate the screw compressor in power-line drive mode, including loading/unloading.

5.4 Drive Mode Switching

Describes the process and precautions for switching between MDI and power-line drive modes.

5.5 Control Process Overview

Provides an overview of the controller's general operation and control logic.

5.5.1 MDI Drive Mode Control

Explains the control process, including PID operation and sleep mode, for MDI drive mode.

5.5.2 Power-line Drive Mode Control

Details the control process, including loading, unloading, and sleep mode, for power-line drive mode.

5.5.3 Fan Control

Explains how the controller manages the fan operation based on drive mode and temperature.

5.5.4 Handling Abnormal Signals

Details how the controller responds to various abnormal signals and faults.

Chapter 6 Troubleshooting

Appendix: MD320 Inverter Alarm Codes

Appendix: Optional Accessories

Power-line Current Transformers

Details the specifications and models of current transformers used with the HOU-88B1G controller.

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Inovance H0U-88B1G User Manual

Table of Contents

Questions and Answers:

Inovance H0U-88B1G Specifications

Summary

Chapter 1 Preface

Chapter 2 Functions and Configuration

2.1 Function Overview

2.2 Hardware Configuration

Chapter 3 Mounting and Wiring

3.1 Controller Wiring

3.2 Screw Compressor Drive Modes

3.3 Controller Terminal Diagram

3.4 Dimension and Installation

3.5 Arrangement 1: Motor/Fan Power-Line Drive

3.6 Arrangement 1: Signal Wiring

3.7 Arrangement 2: Power Wiring

3.8 Arrangement 2: Signal Wiring

3.9 Arrangement 3: Power Wiring

3.10 Arrangement 3: Signal Wiring

3.11 Arrangement 4: Power Wiring

3.12 Arrangement 4: Signal Wiring

3.13 Arrangement 5: Power Wiring

3.14 Arrangement 5: Signal Wiring

Chapter 4 Description on How to Operate the Controller

4.1 Controller Key Functions

4.2 Controller Display Screens

4.3 Menu Item List

4.4 Controller Access Authority

4.5 Function Parameter Settings

4.6 Data Backup and Management

4.7 Alarm Information Handling

Chapter 5 Operating the Screw Compressor

5.1 Operation Precautions

5.2 MDI Drive Mode Operation

5.3 Power-line Drive Mode Operation

5.4 Drive Mode Switching

5.5 Control Process Overview

5.5.1 MDI Drive Mode Control

5.5.2 Power-line Drive Mode Control

5.5.3 Fan Control

5.5.4 Handling Abnormal Signals

Chapter 6 Troubleshooting

Appendix: MD320 Inverter Alarm Codes

Appendix: Optional Accessories

Power-line Current Transformers

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