Model LT-1900

Model LT-1900

The model LT-1900 is a highly reliable, time-based stopping performance monitor designed for precision measurement and safety in machine operations. Utilizing a high-resolution linear transducer, it accurately measures the stopping time of a machine in milliseconds and the strokes per minute (SPM) of the press. The transducer attaches to the machine with a 1:1 linear ratio, ensuring consistent and precise data collection. Every machine stop is displayed in real-time on the bright red LED display on the unit’s front panel, making it easy to monitor stopping times and SPM during each machine cycle.

Ordering Guide
Installation Manual

LT-1900 Applications/Categories: Time Based Stopping Performance Monitor

Package Includes: LT-1900 Controller, Linear Transducer, Mounting Brackets, Magnet, 40′ Transducer Cable, Installation and Operation Manual

Features

  • Warning Indicator: A yellow light illuminates if the stopping time exceeds the setpoint, alerting operators and maintenance teams.
  • Motion Failure Detection: A red LED signals when motion detection pulses are lost, providing immediate feedback.
  • Stopped/No Motion Indicator: A yellow LED activates when valve power is off.
  • Ready/Not Ready Indicators:
    • Green LED: System ready and operational.
    • Red LED: Safety relays deactivated due to faults or improper settings.
  • Pushbutton Programming:
    • Set stopping performance warning and limit time values in milliseconds with +/- pushbuttons for precision adjustments.
  • Failure Alerts:
    • A red LED warns when stopping time exceeds the programmed limit setpoint, ensuring compliance and proactive maintenance.
  • Real-Time Display:
    • Stopping Time: Visible in milliseconds after each stop.
    • SPM: Displayed during each machine cycle.
    • Stopping Performance Warning Time: Displayed in milliseconds
    • Stopping Performance Limit Time: Displayed in milliseconds

Design Specifically for the Rigorous Metal Stamping and Forming Industry

  • Compact, front-panel-mounted controller for easy installation and programming.
  • Compatible with OEM systems, retrofits, and rebuilds.
  • Durable, flat-panel design with NEMA 12-rated steel enclosure.
  • Interfaces seamlessly with solid-state or relay-logic press controls.
  • Solid state indicators – no incandescent bulbs that burn out
  • Made in the USA.

Programming and Safety

  • Setpoint Adjustment: Use the secure keyed selector switch and +/- buttons to set warning and failure thresholds (1–999 ms). Changes are locked while the machine is in motion for added safety.
  • Non-Volatile Memory: EEPROM storage ensures settings and fault data are retained without battery backup, even during power loss.
  • Dual Safety Relays: Force-guided relays automatically deactivate in fault conditions, preventing further operation until reset.
    • Safety relays are always de-energized when the programming key is not in the Run position.
    • Safety relays are energized when the programming key is in the Run position, as long as there are no faults detected.
    • Only a key turn to the reset position can clear a fault, and the relays de-energize if the key is moved into the reset position without a fault.
  • Motion Detection: Motion detection will be monitored while in the reset position, even if the linear transducer has motion.

Predictive Maintenance

The LT-1900 enables proactive maintenance by monitoring factors affecting stopping time, such as:

  • Machine speed and tooling weight
  • Wear adjustment and pressure
  • Air supply
  • Exhaust restrictions

Advanced Diagnostics

  • Self-diagnostics display error codes for easy troubleshooting.
  • Faults are stored in memory with the last recorded stopping time, simplifying maintenance and reducing downtime.

Compliance

The LT-1900 system complies with OSHA code 29 CFR 1910.217 and ANSI Codes B11.3-2012 (R2020) and
B11.2-2013 (R2020) for monitoring and control reliability standards. The unit will automatically prevent the activation of a successive stroke if the stopping time deteriorates beyond the brake limit setpoint.

Technical Specifications

Controller

  • Power: 120 VAC ±10%, 50–60 Hz (standard); optional 24 VDC ±10%
  • Power Consumption: 8 watts (relays on)
  • Operating Temperature: 0–50°C
  • Relays:
    • Safety: Dual self-checking force-guided captive contact safety relays
      • 8A @ 250 VAC resistive for safety relays
      • 4A @ 250 VAC resistive for alarm relay
  • Accuracy: ±1 millisecond
  • Setpoints:
    • Drive Failure: 0.1–2.5 seconds
    • Warning/Failure: 1–999 milliseconds
  • Dimensions:
    • NEMA 12: 8″ H × 7″ W × 4″ D
    • Front Panel Mount: 8″ H × 7″ W × 4″ D
  • Indicators:
    • Ready – Green LED
    • Warning – Yellow LED
    • Stopped/No Motion – Yellow LED
    • Fault – Red LED
    • Motion Fault – Red LED
    • Not Ready – Red LED
    • Stop Time Display – Red LED
    • SPM – Red LED
    • Warning Setpoint – Red LED
    • Limit Setpoint – Red LED

Enclosure Rating: NEMA 12, IP64

  • Dimensions – .34” (8mm) high, 1.1” (28mm) wide (all lengths)
  • Active Length – 4” (101mm) active zone – 10.3” (263mm) total length
  • Active Length – 8” (203mm) active zone – 14.7” (365mm) total length
  • Active Length – 12” (305mm) active zone – 18.4” (467mm) total length
  • Active Length – 16” (406mm) active zone – 22.3” (568mm) total length
  • Active Length – 24” (609mm) active zone – 30.4” (771mm) total length

Ordering Procedure

Model-LT-Ordering-Procedure-1
  1. Specify Mounting Style
    • F: Front Panel Mounting to be installed in an existing control panel
    • C: Stand-alone NEMA 12 (IP 64) steel enclosure.
  2. Specify Controller Input Power
    • 1: 24 VDC
    • 2: 120 VAC, 50-60 Hz
  3. Specify Hydraulic Valve Coil Voltage
    • 1: 24 VDC
    • 2: 120 VAC 50-60 Hz
  4. Specify Linear Transducer Length (Must Equal or Exceed Maximum Machine Stroke Length)
    • 04: 4” (101 mm) active length
    • 08: 8” (203 mm) active length
    • 12: 12” (305 mm) active length
    • 16: 16” (406 mm) active length
    • 24: 24” (609 mm) active length
    • *Consult Sales if over 24” (609 mm) is required.

Mounting Brackets: Supplied standard with each linear transducer

Cable Length: 40′ (12m) supplied standard with each linear transducer

Replacement Parts

  • 11-001 – Metal box enclosure (with gasket) (NEMA 12, IP 64)
  • 11-073 – Metal panel mount (with gasket) open frame for LT-1900
  • 15-079 – 8 position mini-Euro plug connector (Linear Sensor)
  • 20-001 – 1A Slo-Blo glass 3AG fuse
  • 20-022 – 1A Slo-Blo nano SMF fuse
  • 26-101 – Front panel overlay (LT-1900)
  • 32-101 – Safety relay (4 pole, 12 VDC, clear)
  • 42-001 – Software microprocessor chip (specify square or rectangular)
  • 52-002 – Display board
  • 52-084 – Ribbon Cable
  • 52-202 – Transducer board
  • 52-319 – Computer / Power supply / Relay board (with CPU)
  • 40-009 – 4” (10.7” total length, 4.3” sensor area) linear transducer with 40’ (12m) cable
  • 40-010 – 8” (14.7” total length, 8.3” sensor area) linear transducer with 40’ (12m) cable
  • 40-011 – 12” (18.4” total length, 12” sensor area) linear transducer with 40’ (12m) cable
  • 40-012 – 16” (22.5” total length, 16.1” sensor area) linear transducer with 40’ (12m) cable
  • 40-013 – 24” (30.4” total length, 24.0” sensor area) linear transducer with 40’ (12m) cable
  • 40-014 – LT-1900 sensor Magnet (requires 1)
  • 40-015 – LT-1900 Sensor Mounting Bracket (requires 2)
Ordering Guide
Installation Manual