Overview

The CURTIS 1253 provides a cost-effective solution for control of high power DC series-wound hydraulic pump motors. Its system integration features are designed primarily for Class I and Class II material handling vehicles. Typical applications include the pump systems of material handling trucks (counterbalance trucks, reach trucks), aerial lift platforms (scissor lifts, articulating/telescoping booms), and other industrial vehicles.

The 1253 accepts inputs from up to four Speed Select switches and also from an analog throttle. Its internal microprocessor-based logic controller provides maximum flexibility at minimum cost. Its performance characteristics can be tailored through an array of programmable parameters.

The 1253 controller is fully programmable through a CURTIS 1313-4331 Handheld Programmer or 1314 PC Programming Station. The programming device provides diagnostic and test capability in addition to configuration flexibility.

Key Features

• CURTIS Model: 1253-4804
• Norminal Battery Voltage (Volts): 48V
• Amature Current Limit (amps): 600
• Programmable Undervoltage Cutback (Volts): 32-42
• Overvoltage Cutoff (Volts): 60
• PWM operating frequency: 15.6 kHz
• Electrical isolation to heatsink (min.): 500 VAC
• KSI input voltage: 28-60V DC
• KSI input current (no contactors engaged):
  • 60 mA without programmer
  • 130 mA with programmer
• Logic input current: < 1 mA
• Status LED output current (max.): < 2 mA
• Heatsink overtemperature cutback: linear cutback starts at 80°C; complete cutoff at 120°C
• Heatsink undertemperature cutback: 50% current below -25°C
• Operating ambient temperature range: -40°C to 50°C
• Storage ambient temperature range: -40°C to 85°C
• Package environmental rating: IP54
• Throttle Type: 0-5KΩ (default setting), 5K-0Ω, 0-5V or single-ended 3-wire potentiometer (1kΩ to 10kΩ range)
• Dimensions: L196xW146xH77 mm
• Net Weight: 2.6 kg

Features include:

• Smooth and Quiet Control
  • Programmable acceleration rates provide smooth application of pump motor torque.
  • 15.6 kHz PWM frequency for near-silent operation.
• Programmable Flexibility
  • Easily programmable through a CURTIS programming device.
  • Four Speed Select inputs (SS1.SS4) with individually programmable top speeds.
  • Programmable throttle input for precise speed control with a variety of signal sources.
  • Programmable turn-off delay allows SS4 to be used for power steering.
  • Adjustable minimum speed setting to ensure pump lubrication and to maintain steering system pressure.
• Robust Safety and Reliability
  • Interlock feature disables the controller when operator is not present.
  • Programmable startup lockout prevents inadvertent operation.
  • Seamless integration with CURTIS gauges (models 803, 841, 906, and enGage. IV) for lift lockout function.
  • Lift lockout disables the controller at low battery state of charge.
  • Redundant watchdog timer circuits ensure proper software operation.
  • External Status LED output for easy troubleshooting.
  • Short-circuit protection on main contactor driver.
  • Precharge control prevents pitting of contactor tips at startup.
  • Thermal cutback provides protection to the controller.
  • Rugged housing meets IP54 environmental ratings.
• Easily programmable through the CURTIS Model 1313-4331 Handheld Programmer or 1314 PC Programming Station.