Mitsubishi Elevator Door and Manual Operation Circuit (DR) Technical Guide

Door and Manual Operation Circuit (DR)

1 System Overview

The DR circuit consists of two primary subsystems that govern elevator operation modes and door mechanisms:

1.1.1 Manual/Automatic Operation Control

The system implements a hierarchical control structure with clearly defined priority levels:

1. Control Hierarchy (Highest to Lowest Priority):

   • Car Top Station (Emergency Operation Panel)

   • Car Operating Panel

   • Control Cabinet/Hall Interface Panel (HIP)

2. Operation Principle:

   • The manual/auto selector switch determines control authority

   • In "Manual" mode, only the car top buttons receive power (disabling other controls)

   • The "HDRN" confirmation signal must accompany all movement commands

3. Key Safety Features:

   • Interlocked power distribution prevents conflicting commands

   • Positive verification of manual operation intent (HDRN signal)

   • Fail-safe design defaults to safest condition during faults

1.1.2 Door Operation System

The door control system mirrors the main elevator drive system in functionality:

1. System Components:

   • Sensors: Door photocells (analogous to hoistway limit switches)

   • Drive Mechanism: Door motor + synchronous belt (equivalent to traction system)

   • Controller: Integrated drive electronics (replacing separate inverter/DC-CT)

2. Control Parameters:

   • Door type configuration (center/side opening)

   • Travel distance settings

   • Speed/acceleration profiles

   • Torque protection thresholds

3. Protection Systems:

   • Stall detection

   • Overcurrent protection

   • Thermal monitoring

   • Speed regulation

1.2 Detailed Functional Description

1.2.1 Manual Operation Circuit

The manual control system employs a cascaded power distribution design:

1. Circuit Architecture:

   • 79V control power distribution

   • Relay-based priority switching

   • Optical isolation for signal transmission

2. Signal Flow:

   • Operator input → Command verification → Motion controller

   • Feedback loop confirms command execution

3. Safety Verification:

   • Dual-channel signal confirmation

   • Watchdog timer monitoring

   • Mechanical interlock verification

1.2.2 Door Control System

The door mechanism represents a complete motion control system:

1. Power Stage:

   • Three-phase brushless motor drive

   • IGBT-based inverter section

   • Regenerative braking circuit

2. Feedback Systems:

   • Incremental encoder (A/B/Z channels)

   • Current sensors (phase and bus monitoring)

   • Limit switch inputs (CLT/OLT)

3. Control Algorithms:

   • Field-oriented control (FOC) for synchronous motors

   • V/Hz control for asynchronous motors

   • Adaptive position control

1.3 Technical Specifications

1.3.1 Electrical Parameters

1.3.2 Mechanical Parameters

1.4 System Interfaces

1. Control Signals:

   • D21/D22: Door open/close commands

   • 41DG: Door lock status

   • CLT/OLT: Position verification

2. Communication Protocols:

   • RS-485 for parameter configuration

   • CAN bus for system integration (optional)

3. Diagnostic Ports:

   • USB service interface

   • LED status indicators

   • 7-segment fault display

2 Standard Troubleshooting Steps

2.1 Manual Operation from Car Top

2.1.1 Up/Down Buttons Not Functioning

Diagnostic Procedure:

1. Initial Status Check

   • Verify P1 board fault codes and status LEDs (#29 safety circuit, etc.)

   • Consult troubleshooting manual for any displayed fault codes

2. Power Supply Verification

   • Check voltage at each control level (car top, car panel, control cabinet)

   • Confirm manual/auto switch is properly positioned

   • Test HDRN signal continuity and voltage levels

3. Signal Transmission Check

   • Verify up/down command signals reach P1 board

   • For serial communication signals (car top to car panel):

     • Check CS communication circuit integrity

     • Verify termination resistors

     • Inspect for EMI interference

4. Priority Circuit Validation

   • Confirm proper isolation of non-priority controls when in manual mode

   • Test relay operation in selector switch circuit

2.2 Door Operation Faults

2.2.1 Door Encoder Issues

Synchronous vs. Asynchronous Encoders:

Troubleshooting Steps:

1. Verify encoder alignment and mounting

2. Check signal quality with oscilloscope

3. Test cable continuity and shielding

4. Confirm proper termination

2.2.2 Door Motor Power Cables

Phase Connection Analysis:

1. Single Phase Fault:

   • Symptom: Severe vibration (elliptical torque vector)

   • Test: Measure phase-to-phase resistance (should be equal)

2. Two Phase Fault:

   • Symptom: Complete motor failure

   • Test: Continuity check of all three phases

3. Phase Sequence:

   • Only two valid configurations (forward/reverse)

   • Swap any two phases to change direction

2.2.3 Door Limit Switches (CLT/OLT)

Signal Logic Table:

Verification Steps:

1. Physically confirm door position

2. Check sensor alignment (typically 5-10mm gap)

3. Verify signal timing with door movement

4. Test jumper configuration when OLT sensor absent

2.2.4 Safety Devices (Light Curtain/Edges)

Critical Differences:

Testing Procedure:

1. Verify obstruction detection response time

2. Check beam alignment (for light curtains)

3. Test microswitch operation (for edges)

4. Confirm proper signal termination at controller

2.2.5 D21/D22 Command Signals

Signal Characteristics:

• Voltage: 24VDC nominal

• Current: 10mA typical

• Wiring: Shielded twisted pair required

Diagnostic Approach:

1. Verify voltage at door controller input

2. Check for signal reflections (improper termination)

3. Test with known good signal source

4. Inspect traveling cable for damage

2.2.6 Jumper Settings

Configuration Groups:

1. Basic Parameters:

   • Door type (center/side, single/double)

   • Opening width (600-1100mm typical)

   • Motor type (sync/async)

   • Current limits

2. Motion Profile:

   • Opening acceleration (0.8-1.2 m/s²)

   • Closing speed (0.3-0.4 m/s)

   • Deceleration ramp

3. Protection Settings:

   • Stall detection threshold

   • Overcurrent limits

   • Thermal protection

2.2.7 Closing Force Adjustment

Optimization Guide:

1. Measure actual door gap

2. Adjust CLT sensor position

3. Verify force measurement (spring scale method)

4. Set holding current (typically 20-40% of max)

5. Confirm smooth operation through full range

3 Door Controller Fault Code Table

3.1 Fault Severity Classification

3.1.1 Critical Faults (Require Immediate Attention)

• Code 1 (IPM Fault)

• Code 7 (Door Switch Logic)

• Code 9 (Direction Error)

• Code C (Encoder Fault)

3.1.2 Recoverable Faults (Auto-reset)

• Code 0 (Communication)

• Code 2/3/5 (Voltage Issues)

• Code A/D/F (Speed/Load)

3.1.3 Warning Conditions

• Code 6 (Initialization)

• Code E (DLD Protection)

• Codes 0.-5. (Position Warnings)

3.2 Diagnostic Recommendations

1. For Communication Errors (Code 0):

   • Check termination resistors (120Ω)

   • Verify cable shielding integrity

   • Test for ground loops

2. For IPM Faults (Code 1):

   • Measure IGBT module resistances

   • Check gate drive power supplies

   • Verify proper heatsink mounting

3. For Overheat Conditions (Code C):

   • Measure motor winding resistance

   • Verify cooling fan operation

   • Check for mechanical binding

4. For Position Errors (Codes 0.-5.):

   • Recalibrate door position sensors

   • Verify encoder mounting

   • Check door track alignment