DEIF LSU-113DG Load sharing, paralleling & operation



LSU-113DG

Load sharing, paralleling & operation

DEIF's load sharing units offer load sharing in various ways between generators and interfaces to a governor through an electronic potentiometer (EPQ96-2 or EPN110DN).

DEIF’s load sharing units offer load sharing in various ways between generators and interfaces to a governor through an electronic potentiometer (EPQ96-2 or EPN110DN).

Suitable for control of diesel and gas generators, for instance, they can control the power unit in stand-alone mode (performing frequency control) or parallel with other power units (performing frequency and power control).

The units have built-in power and frequency transducers that enable connection of external equipment. Constant power or isochronous mode is also possible. Speed control is conducted by two relays.

Variants

LSU-112DG

Frequency and power control

LSU-113DG

Frequency and power control

With -P>

LSU-114DG

Frequency and power control

With start/stop

LSU-122DG

Reactive

U and Q control

Features

Frequency and power control. With -P>

Built-in power and frequency transducer

Constant power or isochronous mode

LED indication of status

LED indication for activated control

35 mm DIN rail or base mountin

Terminal no. Description/action

1 and 3

X1/X2

Input for supply voltage.

17 and 18

Sta

Status output, activated (closed) when the supply voltage is connected and the unit is working correctly.

28 and 29

IL1

Input for the current measurement. Note that S1 on the external current transformer is connected to

terminal 28. and S2 is connected to terminal 29.

31 and 32

Ext. P.

Must be short-circuited, if the internal power transducer is used (normal). For applications with unbal

anced load it is recommended to use an external power transducer (replacing the built-in one). Connect

external power transducer to 31 (+) and 32 (-). The output of the external transducer must be 4 to 20 mA

DC. The output of the connected transducer must limit the output to min. 2 mA and max. 22 mA. DEIF

transducer type TAS-331DG is recommended.

33 and 34

(“Unl”)

May be connected to a potential-free N/O relay contact. When this contact is activated, the power of the

generator is regulated to zero (unloading) and the LSU-112DG is disconnected from the PS power line.

35

(“Ref.”)

Reference input. Must be connected to term. 36 (“”), if not used. This input is used to control the power

unit running in power control mode (fixed load to grid). A +0.5 V to 5 V connected to the input with re

spect to  will control the PU in the range 10 to 100 % power. The input activates at 0.55 V and deac

tivates at 0.45 V. Please notice that when this input is active the LSU-112DG is still connected to the PS

and FS lines. In this mode the PS line acts only as an output.

37

(“+5V”)

Reference output. This voltage output can be used for local power control mode. If terminal 37 is feeding

a voltage divider, and the output from the voltage divider is connected to terminal 35. local power control

can be performed.

36

(“”)

Common earth terminal for the above reference input/output.

38 (FS) and

39 (“”)

Paralleling line for frequency sharing of the connected LSU-112DGs.

40 (PS) and

41 (“”)

Paralleling line for power sharing of the connected LSU-112DGs. Normally 5 V at nominal busbar volt

age and cos phi = 1. If cos phi 0.8 is stated on the label, 4 V correspond to 100 % power.

43 and 44

Relay con

tacts “SG”

Relay contact for increase of the speed.

45 and 46

Relay con

tacts “SG”

Relay contact for decrease of the speed.

NOTE:

Relay

contacts

Relays (SG) should always be connected via external auxiliary relays when a DC pilot motor is applied.

A transient suppressor should always be connected across the relay coil of the external relays.

NOTE:

All terminals marked “” are internally connected.

For correct function of the LSU-112DG any analogue DC input must not exceed 110 % of its nominal value. To ensure

correct power measurement it is important that the AC current input does not exceed 110 % of its nominal value. To

accomplish this it is important to take the value of the max. cos phi into consideration when ordering/configuring the LSU

112DG, for example by using the kVA figure of the generator and cos phi = 1.