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Peaktronics DHC-100 - User Manual

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TECHNICAL
MANUAL
Modbus User's Guide
DHC Series Controllers
PEAKTRONICS

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Peaktronics DHC-100 Specifications

General IconGeneral
BrandPeaktronics
ModelDHC-100
CategoryController
LanguageEnglish

Summary

Overview

DHC Series Controllers

Lists various DHC controller models and their descriptions covered in the manual.

System Overview

Explains the DHC Controller, its role, and the Modbus connection via OCM-101.

DHC Control Panel

Details parameters related to the DHC controller's front panel and visual aids.

Modbus to PACS Format

Explains the conversion of Modbus protocol to PACS® commands using Function Code $41.

PACS Parameters

Describes PACS® parameters, categorized as Read Only or Read/Write, with a summary table.

Modbus Functions $03 and $06

Details Modbus Functions $03 (read) and $06 (write) for DHC parameters and their limitations.

Modbus Function $08

Explains the Modbus Diagnostics Function ($08) and its Listen Only Mode capability.

PACS Read Only Parameters

Analog Command Input

Describes configuring the DHC for analog input signals (e.g., 4-20mA) and reading its value.

Battery Voltage

Details the DHC-400's monitoring of battery voltage and its scaling.

Position

Explains how the DHC monitors actuator shaft position using a feedback potentiometer.

Average Motor Current

Describes the parameter measuring average motor current over time for power source monitoring.

Motor Current Trip Setting

Details the current trip function for actuator protection, adjustable via trim pot.

Alarm Flags 2

Explains the SING byte value where each bit indicates specific alarm conditions for the DHC-400.

Alarm Flags 2 Bit Assignments

Details the bit assignments for each alarm condition in the Alarm Flags 2 parameter.

Average % Duty Cycle

Explains duty cycle as a measure of actuator on-time vs off-time and its reflection in the parameter.

Maximum Deviation

Describes the parameter measuring the difference between actual and desired actuator position.

Hours of Operation

Details the internal hour meter that tracks powered hours for maintenance scheduling.

Cycles of Operation

Explains the cycle counter measuring how often the actuator was switched on/off.

Alarm Flags

Describes the SING byte parameter indicating alarm conditions, with bit assignments shown.

Alarm Flags Bit Descriptions

Provides detailed explanations for each bit within the Alarm Flags parameter, including fault conditions.

Mode

Explains the SING byte parameter indicating the DHC controller's current mode of operation.

Configuration

Details the SING byte parameter for DHC controller settings like polarity and command type.

Override Control

Explains the SING byte parameter indicating override status and local/remote function.

Serial Number

Describes the DOUB byte value representing the two least significant bytes of the controller's serial number.

Serial No. MSB; Model Code

Details the DOUB byte value indicating the DHC controller model and the most significant byte of the serial number.

PACS Read;Write Parameters

Aux Closed Position

Explains the parameter setting the aux close position related to the "close limit alarm".

Aux Open Position

Explains the parameter setting the aux open position related to the "open limit alarm".

PACS Command Input

Describes the DOUB byte value used to control valve position via the bus.

PACS Control Register

Details the SING byte parameter with bits assigned to various DHC controller functions.

PACS Control Register Bit Assignments

Explains bit assignments within the PACS® Control Register, including command override and manual control.

Override Control Functionality

Explains how the Override Control parameter enables external control, disabling panel buttons.

PACS Reset

Describes the SING byte parameter used to force a DHC controller reset, like powering off and on.

PACS Timeout Setting

Explains the SING byte parameter that defines the time before a PACS® timeout occurs, disabling bus control.

User Non-Volatile Memory

Details 16 bytes of non-volatile memory available for user data storage.

Unassigned Locations

Describes unassigned memory locations, noting they are cleared on power loss and not recommended for use.

Modbus Registers

OCM-101 PACS Off Line Timer Value

Explains the register for the OCM-101's off line timer, its function, and default setting.

Aux Closed Position

Details the register address for the Aux Closed Position parameter and refers to its description page.

Aux Open Position

Details the register address for the Aux Open Position parameter and refers to its description page.

PACS Command Input Register

Details the register address for PACS® Command Input and its interaction with Timeout Setting.

PACS Control Register

Details the register address for PACS® Control Register and its function for overriding analog signals.

Analog Command Input Register

Details the register address for Analog Command Input and refers to its description page.

Position Register

Details the register address for Position and refers to its description page.

Average % Duty Cycle Register

Details the register address for Average % Duty Cycle and refers to its description page.

Maximum Deviation Register

Details the register address for Maximum Deviation and refers to its description page.

Hours of Operation Registers

Details the register addresses for Hours of Operation (32-bit value) and how to read them.

Cycles of Operation Registers

Details the register addresses for Cycles of Operation (32-bit value) and how to read them.

Configuration; Alarm Flags Register

Details the register combining Configuration and Alarm Flags parameters.

Override Control; Mode Register

Details the register combining Override Control and Mode parameters.

Serial No. MSB; Model Code Register

Details the register address for Serial No. MSB / Model Code.

Serial Number Register

Details the register address for Serial Number.

OCM-101 Version Registers

Details the register addresses for OCM-101 version information.

Battery Voltage Register

Details the register address for Battery Voltage.

Average Motor Current Register

Details the register address for Average Motor Current.

Motor Current Trip Setting Register

Details the register address for Motor Current Trip Setting.

Alarm Flags; Alarm Flags 2 Register

Details the register combining Alarm Flags and Alarm Flags 2 parameters.

Application Information

Bus Timing

Explains Modbus serial line bus structure, master/slave roles, and communication timing.

Using a Digital Command Type

Details how to configure the DHC for digital command type and its implications for analog signals.

Digital Command Type Initialization Sequence

Provides an example initialization sequence for setting up the DHC with a digital command type.

Overriding an Analog Command Type

Explains how to override analog command signals using the bus, typically for PID control systems.

Overriding Analog Command Type Initialization Sequence

Provides an example initialization sequence for overriding analog command signals.

Override Operation Example

Illustrates a step-by-step example of overriding analog input signals for actuator control.

PACS Reference Guide

ASCII Conversion Table

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