Description

DEIF DLQ144-PC-NB RPM

This is a digital speed/frequency meter designed for generator set control and monitoring systems.

 

Detailed Product Description

1. Product Name Breakdown

• DEIF: The brand, a global leader from Denmark specializing in control solutions for power generation, marine, and renewable energy.

• DLQ144: The product series, referring to a specific line of compact, high-quality indicating instruments.

• -PC: Typically indicates that the meter is designed for panel mounting and may include specific mounting hardware.

• -NB: This suffix is crucial. It stands for “No Buttons”. This means the device has no front-panel buttons for settings. Its parameters (e.g., range, alarm values) usually need to be configured via an external device (such as a DEIF commissioning tool or a master system).

• RPM: Clearly identifies this as a meter primarily used for measuring and displaying Rotational Speed, while also possessing frequency measurement capabilities.

2. Key Features and Characteristics

• Dual Display: Can display the generator’s speed (RPM) and frequency (Hz) simultaneously or alternately, providing the operator with key operational parameters.

• High Accuracy: Utilizes digital technology to provide highly precise and stable readings.

• No-Button Design (-NB):

  • Advantage: Prevents accidental or unauthorized changes to settings by on-site personnel, enhancing system security and stability. Ideal for standardized applications or those with high safety requirements.

  • Configuration Method: Requires a dedicated programming tool (such as DEIF’s PCS 400/500 software and adapter) to configure via the communication interface on the back of the meter.

• Programmable Setpoints: Features internal relay outputs that can be configured for alarm or shutdown functions. For example, an “overspeed” alarm point can be set, where the meter triggers the relay if the speed exceeds the preset value, activating a visual/audible alarm or initiating a shutdown sequence.

• Multiple Input Signal Compatibility: Can accept speed/frequency signals from various sources, such as magnetic pick-up sensors and voltage transformers.

• Clear Display: Typically uses a high-brightness LED or LCD display for easy reading under various lighting conditions.

• Robust Construction: Designed for industrial environments, offering resistance to vibration, electromagnetic interference, etc.

3. Typical Applications

The DEIF DLQ144-PC-NB RPM meter is widely used in applications requiring precise monitoring of speed and frequency, especially in:

• Generator Sets: Diesel, gas, or heavy fuel oil generator sets, serving as a core monitoring instrument on the control panel.

• Marine Propulsion Systems: For monitoring the speed of main and auxiliary engines.

• Industrial Power Equipment: Such as pumps, compressors, and other engine-driven equipment.

• Power Plants and Grids: For monitoring grid or islanded operation frequency.

4. Role in a System

In a typical generator set control system, the DLQ144-RPM meter acts as the “eyes.” It continuously monitors the engine speed and:

• Displays the information to the operator.

• Transmits the data to the main controller (e.g., a DEIF AGC controller).

• Triggers independent alarm or protection actions (via its built-in relays).

When speed is abnormal (too high or too low), it serves as the first or second line of defense in protecting the generator set from damage.