KMB NOVR 2400 Скачать руководство пользователя страница 3

Страница: 3 / 38

The current signals from 5A or 1A (or 0.1A for the „X/100mA“ models) instrument current transformers must be connected to the

CURRENT

connector terminal pairs

I11 – I12

I21 – I22

I31 –

I32

(No. 1 ÷ 6).

A particular connector is provided with a screw lock to prevent an accidental pullout and possible unwanted disconnection of the current circuit.
A connection cable maximum cross section area is 2.5 mm

1.2.4 Outputs

Instruments can have up to 18 outputs. For models with more than 9 outputs, the outputs are arranged in two output groups. The groups are isolated from each other. Each
group has one common pole terminal

C1, C2

( No.15 and 25 ) and up to nine individual output terminals

1.1

through

1.9

( No.16 ÷ 24 ) for group No. 1 and

2.1

through

2.9

( No.26 ÷ 34 ) for group No. 2.
Any combination of compensation capacitors or chokes (three-phase, two-phase or single -phase) can be connected to the instrument outputs via appropriate contactors.
If not of all outputs used, you can use upper three outputs for alarm signalling or for heating/cooling control ( see example wirings further below).
A connection cable maximum cross section area is 2.5 mm

1.2.5 Digital Input

Models with 7 and 16 outputs are equipped with the digital input. It can be used for the 2

tariff control of power factor control process or for electricity meter tariff control.

Use terminals

D1A

D1B

(No.23 and 24) for the digital input connection – see wiring examples in appropriate chapter further below. The input is isolated from other instrument

circuitry.
To activate the output apply voltage of specified range to the terminals.

2. Commissioning

On connecting power supply, the instrument performs internal diagnostics, display test and then gradually shows screens with the instrument type and setting of basic
parameters : instrument model and firmware version number, VT-ratio (if indirect voltage connection is set), CT-ratio and nominal frequency f

NOM

and nominale voltage U

NOM

Then the instrument starts display actual measured values. Simultaneously, if the instrument has a communication line, it can be set and its measured values read via the
communication link using a PC.
As, because of the first installation, the instrument knows neither output types nor reactive power sizes of individual outputs, it gets into the standby mode, which is signalled
by flashing symbol

If measuring voltage is present and measured current reaches at least minimum level, the instrument tries to start automatic output recognition ( AOR ) process that is
indicated with flashing symbol

and the

message. As soon as it occurs, switch into instrument parameters with the

key. When parameters are displayed, the

AOR-proces is cancelled and the controller stays in the standby mode until it returns back to measured quantities display – that occurs automatically after about 30 seconds if
no key is pressed.
At this moment, before we let the AOR-process running it is necessary to set so called

Installation

parameters, that are essential for proper operation of the instrument.

2.1 Measured Electrical Quantities Installation Setup

For proper data evaluation it is necessary to set the

Installation Setting

group parameters, starting from parameter 71 up :

•

CT- ratio

( p. 71 ). Can be set in form either …/ 5A or …/ 1A.

Furthermore, so called

I-Multiplier

can be set too. You can modify the CT- ratio with this parameter. For example, to get better precision when using

overweighted CTs, you can apply more windings of measured wire through the transformer. Then you must set the multiplier. For example, for 2 windings
applied, set the multiplier to 1/2 = 0.5 .

For standard connection with 1 winding, the multiplier must be set to 1.

•

Connection Type

( p. 72 ) needs to be set according network configuration – wye ( or star,

) delta (

, if neutral voltage potential not connected ),

or Aron (

). For single-phase connection, set