The CURTIS 1253-4804 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 1253-4804 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.

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)

mooth 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.

Package:Normally we use the standard exporting packaging. We also can according to clients' request .
1. By Couriers: DHL, UPS, FEDEX, TNT are the main courier companies we are cooperating.
2. By Air: Delivery from the Shanghai airport to customer's destination city air port.
3. By Sea: Delivery from the Shanghai sea port .

Q1. Can I have a sample order?
A: Yes, we welcome sample order to test and check quality.
Q2. What about the lead time?
A: Sample needs 3-5 days.
Q3. Do you have any MOQ limit?
A: Low MOQ, 1pc for sample checking is available
Q4. How do you ship the goods and how long does it take to arrive?
A: We usually ship by DHL, UPS, FedEx or TNT. It usually takes 3-5 days to arrive. Airline and sea shipping also optional.
Q5. How to proceed an order?
A: Firstly let us know your requirements or application.
Secondly We quote according to your requirements or our suggestions.
Thirdly customer confirms the samples and places deposit for formal order.
Fourthly We arrange the production.
Q6. Is it OK to print my logo on the product?
A: Yes. Please inform us formally before our production and confirm the design firstly based on our sample.
Q7: Do you offer guarantee for the products?
A: Yes, we offer 1 year warranty to our products.
Q8: How to deal with the faulty?
A: Our products are produced in strict quality control system and the defective rate will be less
than 0.2%.