DEIF LSU-112DG generator set parallel control unit

40,41 PS, ⊥ power sharing line and common terminal

43,44 SG ▲ Speed up Relay Contact

45,46 SG ▼ Deceleration relay contacts

4.2 Selection of Wiring Types

LSU-112DG supports two standard voltage connections:

1W3 (standard): Suitable for three-phase three wire balanced loads. Connect L1 to terminal 24 and L2 to terminal 26.

1W (phase voltage and neutral point): Suitable for using phase voltage in single-phase or three-phase four wire systems. L1 (P) is connected to terminal 24, and the neutral wire is connected to terminal 26.

The current measurement is always carried out through a single-phase current transformer with terminals 28-29 (usually taking the L1 phase current). Therefore, for three-phase systems, power measurement is based on the approximation of "one phase current+line voltage" of I × cos φ, which is only applicable to balanced loads.

4.3 Important precautions

All terminals marked with "⊥" should be connected internally and reliably grounded to ensure measurement accuracy.

The analog DC input shall not exceed 110% of the nominal value.

The current input shall not exceed 110% of the rated value to ensure accurate power measurement. When selecting, the maximum power and power factor of the generator should be considered. For example, the maximum current should be calculated based on the generator kVA and cos φ=1 to ensure that the secondary side of the current transformer does not exceed 5A (or the set value) at full load.

When the relay contacts drive inductive loads (such as DC motors), external intermediate relays must be used and transient suppressors must be installed.

Technical specifications and performance parameters

5.1 Measurement Input

Rated current (I ₙ): optional 0.3~5.0A AC (set through calibration module). The adjustment range is 75%~100% I. Overload capacity: 4 × I ₙ continuous, 20 × I ₙ 10 seconds (maximum 75A), 80 × I ₙ 1 seconds (maximum 300A). Power consumption per phase ≤ 0.5VA.

Rated voltage (U ₙ): 57.7~690V AC, available in multiple levels. The scope of work is 60%~120% U ₙ. Overload: 1.2 × U ₙ continuous, 2 × U ₙ 10 seconds. Input impedance 2k Ω/V.

Frequency range: 40~70Hz, rated frequency can be set to 45~65Hz.

5.2 Output

Speed control relay: Two normally open contacts, rated capacity AC1/DC1: 250V AC/24V DC, 8A; AC15/DC13：250V AC/24V DC，3A。 The electrical lifespan is 1 × 10 ⁵ times.

Analog parallel line output: PS/FS line output -5~0~5V DC, corresponding to -100%~0~100% power or -2.5Hz~0~+2.5Hz frequency. Accuracy ± 2%.

Reference voltage output:+5V DC ± 1%, maximum load 5mA.

Status output: Optocoupler output, maximum 30V DC/5mA, cut-off in case of fault.

5.3 Power Supply

AC power supply type: 57.7~690V AC ± 20%, power consumption ≤ 3.5VA.

DC power supply type: 24, 48, 110, 220V DC, -25%/+30%, power consumption ≤ 2.5W. UL certification is only limited to 24V DC.

The DC power supply must meet the requirements of Class 2 power supply.

5.4 Environment and Isolation

Working temperature: -25 ℃~+70 ℃ (UL certification upper limit of 60 ℃).

Climate grade: HSE (DIN 40040), suitable for high humidity environments.

Electromagnetic compatibility: Complies with IEC/EN 61000-6-1/2/3/4.

Isolation voltage: Measure voltage, current, relay, analog quantity, and auxiliary power supply between 3250V 50Hz for 1 minute.

Protection level: enclosure IP40, terminal IP20 (IEC 529/EN 60529).

Flame retardant: All plastic components comply with UL94 V-1 self extinguishing.

5.5 Mechanical specifications

Wiring capability: maximum 4.0mm ² single strand wire, 2.5mm ² multi strand wire.

Installation: Panel installation, equipped with a transparent dust cover (can be lead sealed to prevent accidental adjustment).

Settings and Instructions

6.1 Front panel adjustment components

Frequency setting: 45~65Hz continuously adjustable.

Derating: 50%~100% rated power.

T-N (minimum on-time): 25~500ms.

X_P (proportional band): 0~± 50% power or 0~± 2.5Hz.

There are also internal jumpers used to select factors such as TP multiples and dead zone widths, as detailed in the customization manual.

6.2 LED indicator lights

UG (green): The generator voltage is constantly on; Extinguish upon loss of pressure.

Unload (green): It lights up when the unit is in a unloaded state.

SG ▲ (yellow): It lights up when the speed increasing relay is engaged.

SG ▼ (yellow): It lights up when the deceleration relay is engaged.

6.3 Calibration

The unit has been calibrated according to the order requirements when it leaves the factory, and generally only minor adjustments to the derating and proportional parameters are needed on site. If you need to change the measurement range (such as current ratio), you need to send it back to DEIF or use a dedicated calibration module.

Typical application wiring example

7.1 Single machine fixed load operation

The unit is equipped with a fixed load independently. Simply connect the LSU-112DG according to 1W3, and connect the reference input terminal (35) to the set voltage from the potentiometer (or suspend and short-circuit to 36 for internal frequency control). The PS and FS lines can be left unconnected or only used for monitoring. The output of the governor is connected to the actuator.