Name: 1756-L73 Allen-Bradley Series Logic Controller
Price: 7787 CNY
Availability: InStock

Description

Pre-Installation Requirements‌

‌Power Specifications‌
- Primary Input: 24V DC (18-32V DC)
- Redundant Input: 24V DC (optional)
- Max Inrush: 35A @ 20ms
- Isolation: 1500V AC (input-to-backplane)
‌Safety Compliance‌

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- Arc Flash Category: PPE Level 1 (NFPA 70E) - Disconnect Device: UL 489 circuit breaker (≥10A) - Grounding: <1Ω chassis-to-earth (AWG 6 min)

‌Wiring Sequence‌

‌Step 1: Power Connections‌

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1. Terminate primary power at TB1:

   • PIN 1: 24V DC+ (via 8A slow-blow fuse)

   • PIN 2: 0V DC- (direct to PSU star point)

   • PIN 3: Chassis ground (M4 screw, 2.2 Nm torque)

2. For redundant power (1756-PB75 module): • Secondary input at J6 connector • Maintain 30mm separation from AC wiring

‌Step 2: Controller Interfaces‌

‌Port‌	‌Connection‌	‌Cable Type‌
Serial (RS232)	CIP programming (1784-U2CIC)	Shielded 1503A (≤15m)
Ethernet	1756-EN4TR (IP67 rated)	Cat6 SFTP (T568B)
SD Card Slot	Firmware recovery only	SanDisk Industrial SD

‌Step 3: I/O Wiring Standards‌

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[Digital Input Groups]

- Group 0-3: Sourcing (PNP) config:

  INx+ → 24V DC via 5.6kΩ resistor

  INx- → Sensor common

[Analog Outputs] - Voltage mode: Twisted pair + drain wire - Current mode: 250Ω precision resistor load - Separation: ≥50mm from AC conductors

‌Critical Wiring Practices‌

⚠️ ‌EMC Mitigation‌

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• Segregate power/control cables:

  - Parallel runs: 200mm min separation

  - Crossings: 90° angle only

• Shield termination: Single-point ground at PDU

• Ferrite cores: Type 31 (100MHz) on comm cables

⚠️ ‌Hot-Swap Precautions‌

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▸ Always disconnect   POWER A before module removal

▸ Wait for STATUS LED = Solid RED (capacitor discharge)

▸ Verify backplane voltage <2V DC (measure at test point TP7)

‌Validation & Testing‌

‌Pre-Energization Checks‌
- Continuity test: Input-to-ground >1MΩ @ 500V DC
- Short-circuit test: Outputs to chassis (should be OL)
‌Power-On Sequence‌

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1. Apply control power → Wait for BOOTP timeout (90s) 2. Verify LEDs: OK: Green solid FORCE: Off I/O: Amber during self-test 3. Check backplane current: ≤1.8A @ 28V DC

‌Compliance References‌

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Standard        Clause      Requirement

UL 61010-1      6.3.2       Creepage clearance (>4.0mm)

IEC 61131-2     Table 12    Vibration immunity (15G @ 11ms)

NEC 409.110     (2)         Short-circuit current rating (65kA IC)

‌Terminal Specifications‌

‌Component‌	‌Torque‌	‌Wire Range‌
Power terminals	0.6 Nm	24-12 AWG (stranded)
Communication ports	0.25 Nm	28-18 AWG
Ground lug	4.5 Nm	6 AWG (min)

1756-L73 Allen-Bradley Series Logic Controller PDF

1756-L73

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