IFM DD 2500 Series Speed Monitor

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2025/7/4 Update

Speed monitor｜DC Speed and standstill applications
— The speed monitor calculates the rotational speed by evaluating pulses. The transistor and relay outputs switch when an adjustable setpoint is exceeded or not reached. This enables reliable overspeed or standstill detection, etc.

IFM DD 2500 Series Speed Monitor

Technical Features

Uses independent relay outputs to monitor 2 limit values.

Input frequency of up to 60,000 pulses/minute.

Configurable function, with an analog output proportional to speed.

Clear and easy-to-read bright OLED display.

Extended operating temperature range down to -40 °C.

Products + Accessories Selection:

Operating voltage (V)	Input	Input function	Setting range (pulses/min)	Setting range (Hz)	Analog output	Relay output	Transistor output	Order No.
110…240 AC/DC; 24 DC	1	PNP / NPN / NAMUR*	1…60,000	0.1…1,000	1	2	2	DD2503
110…240 AC/DC; 24 DC	2	PNP / NPN / NAMUR*	1…60,000	0.1…1,000	–	2	2	DD2505
*Note: NAMUR input is not suitable for intrinsically safe applications in hazardous locations.

Specifications:

Relay output:
- 2 changeover contacts
- 6 A (250 V AC)
Transistor output:
- 2 x PNP; external supply
- 24 V DC / max. 150 mA;
- short-circuit protection
Ambient temperature: -40…60 °C
Housing protection class: IP 50
Terminal protection class: IP 20
Function display:
- OLED display;
- 128 x 64 pixels
Input signal indicator: Yellow LED
Switching status indicator: Green LED

What’s More:

use5 — Inductive and capacitive proximity sensors or photoelectric sensors
are the ideal choice for providing input signals to the speed evaluation system.

Benefits Introduce In Detail

Extensive Speed Monitoring and Standstill Detection

The speed monitor calculates the rotational speed by evaluating pulses. The transistor and relay outputs switch when an adjustable setpoint is exceeded or not reached. This enables reliable overspeed or standstill detection, etc.

The DD2503 can monitor the speed of a single channel based on 2 separately settable limit values. An independent output is assigned to each limit value. The DD2505 can monitor 2 independent input channels, with 1 switching point for each channel.

Overspeed monitoring

The speed monitor can monitor whether centrifuges, disc conveyors, or wind turbines exceed their maximum speed. Once the speed is too high, the speed monitor immediately sends a shutdown signal to ensure that centrifugal force does not destroy the system.

Standstill monitoring

Standstill monitoring is used to detect damaged conveyor belts, monitor V-belts of ventilation equipment, or detect blockages in screw conveyors. When the non-driven side of a machine comes to an unexpected standstill, the speed monitor issues an abnormal function signal.

Configurable output function

When the limit value is exceeded or not reached, the relay output switches to open or closed, and may remain in the switched state until a manual reset. Alternatively, a reset can also occur automatically after an adjustable period of time.

A simultaneously usable transistor output switches synchronously to the relay. This can be connected to a PLC, which allows for the transmission of status information, etc.