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Miyachi Unitek 250DP - User Manual

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USER'S MANUAL 990-280
Revision H March 2004
250DP DUAL PULSE
STORED ENERGY RESISTANCE WELDING
POWER SUPPLIES
Model Stock No.
250DP 1-250-XX
250DP/208 1-250-XX-01
250DP/230 1-250-XX-02
250DP/100 1-250-XX-03
250DPS 1-254-XX
250DPS/208 1-254-XX-01
250DPS/230 1-254-XX-02
250DPS/100 1-254-XX-03
NOTE: Units with the built-in Weld Sentry
Option also require User's Manual No. 990-291.

Table of Contents

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Summary

CHAPTER 1: SYSTEM DESCRIPTION

Applications

Describes the 250DP as a versatile, 250 watt-second stored energy, capacitor discharge, dual pulse power supply.

Features

Details the multi-function microprocessor control, dual pulse welding benefits, and available weld functions.

APPENDIX A: TECHNICAL SPECIFICATIONS

250 DP Power Supply

Overview of the 250DP as a 1.5 to 250 watt-second stored energy power supply with dual pulse capability.

Output Pulse Characteristics

Defines pulse width, polarity, rise time, and pulse height measurements for the 250DP.

Weld Schedules

Information on saving and defining up to 127 different weld schedules in SRAM.

Weld Schedule Definition

Lists the information defining a weld schedule, including number, function, polarity, and energy.

Options

Describes how to change system options like units of measure, schedule number, and buzzer settings.

Weld Sentry

Details options and utilities for the Weld Sentry monitoring system if installed.

System Setup

Defines default system parameters for head type, footswitch, security, and timing.

Weld Functions

Explains the selectable weld functions: Basic, Repeat, and Rollspot, and their duration settings.

Head Type

Describes compatibility with manual, user-actuated, or air-actuated weld heads and automatic detection.

Footswitch Type

Explains the requirement for 1-level or 2-level footswitches and their automatic detection.

Footswitch Weld Abort Feature

Describes the feature controlled by options menu for aborting the welding sequence via footswitch.

Firing Switch Type

Details the types of input signals the 250DP can use: single pole, 3-wire, or optical switches.

Initiation Switch

Explains the role of the force firing switch (manual) or footswitch (air) as the initiation switch.

Alarms

Details the three types of alarms issued by the 250DP and how to clear them.

Relay Outputs

Details the use of two output relays for status signals and controlling external devices or weld heads.

CHAPTER 2: INSTALLATION

CHAPTER 3: OPERATING CONTROLS AND SCREENS

Operating Controls

Illustrates and identifies the operating controls on the front panel of the 250DP.

Front Panel Key Functions

Details the function of each key on the 250DP front panel, including keypad, navigation, and mode keys.

Screen Formats

Illustrates the information displayed in various operational states like RUN, PROGRAM, NO WELD, and MENU.

CHAPTER 4: GETTING STARTED

Powering Up

Step-by-step guide to turning on the 250DP and selecting initial settings for operation.

Adjusting an Air Actuated Weld Head

Instructions for setting up and adjusting air actuated weld heads, including pressure and flow controls.

CHAPTER 5: OPERATING INSTRUCTIONS

Successful Welding

Guide to establishing parameters for making and evaluating successful welds.

Resistance Welding Parameters

Defines the three basic welding parameters: heat, time, and pressure, and their controlling factors.

Making a Weld

Step-by-step instructions for initiating and performing a weld using the 250DP.

Evaluating the Weld

Methods for assessing weld quality, including visual inspection and pull tests.

CHAPTER 6: PROCESS DEFINITIONS AND WELD FUNCTIONS

250 DP States

Describes the seven operational states of the 250DP: RUN, NO WELD, PROGRAM, MENU, HELP, STANDBY, and FIRE.

MENU State

Explains how to access options common to all schedules, Weld Sentry, and general information via the menu.

HELP State

Details the context-sensitive help feature accessible by pressing the HELP key for operational guidance.

CHAPTER 7: MAINTENANCE

Modification and Calibration

Recommends contacting the Repair Department for calibration and modification advice.

Calibration

Guidelines for checking the calibration of the 250DP, emphasizing qualified technician performance.

Troubleshooting

Helps diagnose and resolve issues, such as circuit breaker trips, by identifying probable causes.

Repair Service

Provides contact information and procedures for telephone and factory service repairs.

Miyachi Unitek 250DP Specifications

General IconGeneral
Rise Time1 ms
Input Frequency50/60 Hz
Efficiency85%
Operating Temperature0 - 40°C
Storage Temperature-20 - 60°C
TypeDC Resistance Welding Power Supply
Operating ModeConstant Voltage, Constant Current
Voltage Range1 - 10 V
Output Voltage10 V max
Cooling MethodAir

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