Mitsubishi Elevator Nexway VFGH Elevator Commissioning Manual: Safety & Control Panel Guidelines

1. Essential Safety Precautions

1.1 Power Safety Requirements

1. Capacitor DischArge Verification

   • After cutting the main elevator power, the DCV LED on the surge absorber board (KCN-100X) will extinguish within ~10 seconds.

   • Critical Action: Before servicing drive circuits, use a voltmeter to confirm the voltage across the main capacitors is near zero.

2. Group Control Panel Hazard

   • If a group control system is installed, the shared terminals (red-marked terminals/connectors) remain live even when a single elevator's control panel is powered off.

1.2 Control Panel Operational Guidelines

1. ESD Protection for Semiconductors

   • Avoid direct contact with base-triggered semiconductor components on E1 (KCR-101X) or F1 (KCR-102X) boards. Static discharge may damage IGBT modules.

2. IGBT Module Replacement Protocol

   • If an IGBT module fails, replace all modules within the corresponding rectifier/Inverter unit to ensure system integrity.

3. Foreign Object Prevention

   • Prohibit placing loose metal parts (e.g., screws) on the control panel top to avoid short-circuit risks.

4. Power-On Restrictions

   • Never energize the drive unit if any connectors are unplugged during commissioning or maintenance.

5. Workspace Optimization

   • In confined machine rooms, secure side/rear control panel covers before final installation. All servicing must occur from the front.

6. Parameter Modification Procedure

   • Set the R/M-MNT-FWR toggle switch to MNT position before altering elevator program parameters.

2. Power Supply Verification

2.1 Control Voltage Inspection

Verify input/output voltages across designated measurement points:

P1 Board Power Supply Verification:

• -12V to GND: DC-12V (±5%)

• +12V to GND: DC+12V (±5%)

• +5V to GND: DC+5V (±5%)

2.2 Car & Landing Power Supply Check

Validate AC voltage for cabin and landing systems:

2.3 Connector & Circuit Breaker Inspection

1. Pre-Energization Steps:

   • Turn OFF NF-CP, NF-SP, and SCB switches.

   • Ensure all connectors on P1 and R1 boards are securely plugged in.

2. Sequential Power-On Protocol:

   • After activating NF-CP/NF-SP/SCB, power ON safety breakers and circuit protection switches one at a time.

   • For selective power circuits, confirm voltage compliance before closing switches:

   Power Circuit	Protection Switch	Measurement Point	Standard Voltage	Tolerance
   DC48V	ZCA	Primary side ↔ Terminal 107	DC48V	±3V
   DC24V	ZCB	Primary side ↔ Terminal 107	DC24V	±2V

3. Backup Power Warning:

   • DO NOT touch the secondary side of the BTP circuit protector – backup power remains active.

3. Motor Encoder Inspection

3.1 Encoder Testing Procedure

1. Power Isolation:

   • Turn OFF the NF-CP power switch.

2. Encoder Disconnection:

   • Remove the encoder connector on the traction machine side.

   • Loosen the encoder mounting screws.

3. PD4 Connector Verification:

   • Confirm secure connection of PD4 plug on the P1 board.

4. Voltage Check:

   • Turn ON NF-CP.

   • Measure voltage at the encoder connector:

     • Pins 1 (+) ↔ 2 (–): +12V ±0.6V (critical tolerance).

5. Reconnection Protocol:

   • Turn OFF NF-CP.

   • Reattach the encoder connector.

6. Parameter Configuration:

   • Turn ON NF-CP.

   • Set P1 board rotary potentiometers:

     • MON1 = 8, MON0 = 3.

7. Direction Simulation Test:

   • Rotate the encoder to simulate elevator UP direction.

   • Confirm 7SEG2 display shows "u" (refer to Figure 4).

   • If "d" appears: Swap encoder wiring pairs:

     • ENAP ↔ ENBP and ENAN ↔ ENBN.

8. Finalization:

   • Securely tighten encoder mounting screws.

4 LED Status Diagnostics

Refer to Figure 1 for board layouts.

Critical Checks:

1. Rectifier Unit Validation:

   • After power-up, CFO on 7SEG must illuminate.

   • If CFO is off: Inspect power circuit wiring and phase sequence.

2. WDT Status Verification:

   • Confirm illumination of:

     • CWDT and MWDT (KCD-100X)

     • WDT (KCD-105X)

   • If WDT is off:

     • Check +5V supply and connector integrity.

3. Capacitor Charge Circuit Test:

   • DCV LED on capacitor board (KCN-1000/KCN-1010) must:

     • Illuminate when powered ON.

     • Extinguish ~10 seconds after power-off.

   • Abnormal DCV behavior: Diagnose:

     • Inverter unit

     • Charge/discharge circuits

     • Capacitor terminal voltage

Figure 1 LED status on the P1 board