Lenze 3253-11 EL108 Digital Speed Indicator
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Product Information
The Lenze 3253-11, model EL108, is a digital speed indicator within the Lenze EL Series designed to process and display rotational speed, pulse rates, and process frequencies in industrial control setups. Operating on a 230 V AC mains supply at 50/60 Hz, this panel-mounted module receives incoming signal pulses directly from drive outputs, tachogenerators, proximity switches, and external sensors. Equipped with a high-contrast 4-digit red 7-segment LED display, the indicator delivers real-time visual process monitoring for machine operators up to a maximum count of 9999.
Wiring is handled via rear screw terminals for panel installation and routine maintenance. The module features an integrated 12 V DC auxiliary power supply output, allowing NPN and PNP pulse sensors or proximity switches to be powered directly from the rear terminal strip without needing an external sensor power supply unit. Commissioning a replacement unit requires hardware adjustment using internal and rear DIP switches and potentiometers to set decimal point locations and scale the measuring range. No software tools or network connections are required, and ABC Industrial Parts can assist maintenance personnel in securing tested replacement modules to minimize machine downtime.
Diagnostic feedback on the EL108 is provided directly through the main 4-digit LED screen, which displays a flashing reading during an overflow condition when the measured input frequency or speed exceeds 9999 count. Basic field verification includes checking the 230 V AC supply voltage, confirming the 12 V DC auxiliary output voltage, and verifying connection integrity at the rear screw terminals. Incorrect display scaling can usually be corrected by adjusting the DIP switch configurations and potentiometers. Internal circuit board issues are not field-serviceable, making unit replacement or tested repair through ABC Industrial Parts a reliable approach to restoring panel operation.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | 3253-11 |
| Model / Type | EL108 |
| Product Family | EL Series (EL100) |
| Component Type | Digital Speed Indicator |
| Supply Voltage | 230 V AC |
| Line Frequency | 50/60 Hz |
| Auxiliary Power Output | 12 V DC |
| Display Type | 4-Digit Red 7-Segment LED |
| Display Capacity | Up to 9999 count |
| Configuration Method | DIP Switches and Potentiometers |
| Connection Type | Rear Screw Terminals |
Programming and Configuration
The Lenze 3253-11 EL108 utilizes a hardware-driven configuration architecture. The unit does not require engineering software tools, programming cables, or digital parameter transfer routines during setup or replacement.
Hardware adjustments are made using internal and rear DIP switches and potentiometers. DIP switches allow technicians to position the decimal point on the 4-digit LED display, while potentiometers calibrate and scale the input pulse rate to reflect real-world process values such as motor RPM or conveyor line speed.
Communication and System Integration
Integration into control cabinets is accomplished via a rear screw terminal strip. The indicator interfaces with pulse and frequency signals generated by drive outputs, tachogenerators, and external NPN or PNP pulse sensors in standard 230 V AC control circuits.
To reduce cabinet complexity, the module incorporates a dedicated 12 V DC auxiliary power output on its rear terminal block. This built-in supply powers connected proximity sensors directly, eliminating the need for separate external DC power supplies.
Diagnostics and Status Indication
The EL108 communicates status and range conditions using its primary 4-digit red 7-segment LED screen.
If the input pulse rate or rotational speed exceeds the maximum display capacity of 9999 count, the numbers flash to indicate an overflow condition. This immediate visual alert signals that the signal frequency exceeds either the configured range setting or the 4-digit display limit.
Replacement and Spare Part Considerations
Replacing a damaged Lenze 3253-11 EL108 with an exact matching unit maintains electrical and physical compatibility with existing panel cutouts and 230 V AC wiring layouts. This avoids unnecessary cabinet modifications or signal conversion hardware.
When installing a spare unit, technicians should match the DIP switch positions and potentiometer settings of the original module. Aligning these hardware adjustments ensures that decimal placement and signal scaling remain accurate for the connected drive system.
Frequently Asked Questions
Does the Lenze 3253-11 EL108 require programming software?
No programming software is required. Configuration is completed entirely through hardware DIP switches and potentiometers on the unit.
What supply voltage is required for the Lenze 3253-11 EL108?
The indicator operates on a standard 230 V AC mains power supply at 50/60 Hz.
Can external sensors be powered directly from the EL108?
Yes, the EL108 features an integrated 12 V DC auxiliary power output on the rear terminal block to power connected NPN or PNP pulse sensors.
How does the Lenze 3253-11 display an over-range condition?
The 4-digit red LED display flashes to indicate a display overflow when the input value exceeds 9999 count.
How is the decimal point set on the display?
The decimal point position is configured using internal hardware DIP switches on the indicator module.
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Specific firmware and hardware versions
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Disclaimer:
We are not an authorised distributor of Lenze.
Product photos are for illustration purposes only and may differ from the actual product delivered.
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