ComAp NPU Installation And Operation Instructions Manual

Software version 1.8, September 2003
Prague, Czech Republic
Copyright © 2003 ComAp s.r.o.
Written by Libor Šindelářl and Milan Vandírek

ComAp, spol. s r.o.

Světova 7, 180 00 Praha 8, Czech Republic
Tel: [phone], Fax: [phone]
E-mail: [e-mail], www.comap.cz

NPU Unit

Mains decoupling relay

Installation and Operation Instructions

User guide

NPU, SW Version 1.8, ©ComAp, September 2003
NPU-1.8r2.PDF 2

1. Contents

1. Contents 2

2. Technical Specification 3
NPU Technical Specification 4
NPU Mechanical Design 5

3. Installation 6
Power Supply 6
Analog Inputs 6
Output Relays 6
The NPU Unit Wiring Diagram 7

Connection NPU Unit to phase-to-neutral voltage 7
Connection NPU Unit to phase-to-phase voltage 8

4. Function 9
Protection types 9

Overvoltage protection 9
Undervoltage protection 9
Overfrequency protection 9
Underfrequency protection 9
Voltage assymetry protection 9

Vector shift supervision 9
Phase sequence supervision 10
Frequency measurement 10
Internal watchdog 10
Output Relays 10
Example: Evaluation of under voltage protection 11
Vector Shift Protection 12

5. Settings 14
Buttons 14
Display and LEDs 14
Parameters settings 14

6. Displayed Quantities and Parameters 15
Set A: 15

Default setting 16

Set B: 17

Default setting 17

7. Order codes 19

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2. Technical Specification

The NPU unit is designed for 3-phase mains protection. Operator can switch on/off available protections or
adjust limits and time delays for each protection.
Rated voltages are 100, 230, 400, 480 VAC selected by order - see order codes. Measuring voltage
frequency range is from 44 up to 68 Hz.
NPU power supply voltage can be in the range 90 ÷ 250 VAC or 16 ÷ 110 VDC selected by order - see
order codes.

NPU offers following protections:

• Over frequency protection

• Under frequency protection

• Over voltage protection

• Under voltage protection

• Phase sequence supervision

• Voltage asymmetry protection

• Vector shift supervision

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NPU Technical Specification

Parameter Specification

Dimensions 75 x 100 x 115 mm
Power supply
NPU XXX/YYY/230VAC
NPU XXX/YYY/24VDC

90 ÷ 250 VAC
16 ÷ 110 VDC

Power consumption c. 3 W
Insulation 4 kV
Elmg. Interference immunity According to IEC 50082-2
Elmg. Interference According to IEC 55022
Temperature range

-20 ÷ +70°C

Protection IP20
Rated voltage 100, 230, 400, 480 VAC (by the order)
Maximal voltage range Rated + 30 %
Rated frequency 50 / 60 Hz
Maximal frequency range 44 – 68 Hz
Accuracy of frequency measuring 0,2% from rated value (from 10% of rated voltage value)
Accuracy of voltage measuring

1% from rated value at rated frequency ± 10% and 25°C
1,5% over whole temperature range

Signal relay contacts

- max. switched voltage / current

- max. switched power

- rated voltage / current

- minimum load

- lifetime

250 V / 4 A
rezistive load: 1000 VA AC, 200 W DC
inductive load: 500VA AC, 25W DC
rezistive load: 250V / 4A AC
200V/0,1A DC, 24V 4A DC
inductive load: 250V / 2A AC
200V/0,1A DC, 24V 3A DC
1W / 1VA at U

min

> 10V

1x105 cycles
Overvoltage category Class. III
Time delay accuracy

0.2% +0÷30ms

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NPU Mechanical Design

The NPU is packaged in a plastic box for assembly on a mounting plate TS 35 (DIN rail 35 mm).
NPU could be also mounted with two screws M4 (with span 60mm) to a mounting board. For this
alternative it is necessary to take out and turn clamp on the rare side of the box.
NPU has four operating push-buttons. The SET button (for settings) can be protected with cover (fixed by
wire with two seals). The NPU has an LED display (four digits) and 10 LEDs for indication. Dimensions are
on the figure.

1

1

5

,

0

75,0

100,0

Set

NPU

PWR

ERR

L1

UU

U

f

L2

L3

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3. Installation

Power Supply

There are two types of NPU units – see chapter 7 – Order codes:
NPU XXX/YYY/230VAC power supply is in range 90 ÷ 250 VAC
NPU XX/YYY/24VDC power supply is in range 16 ÷ 110 VDC
Power supply polarity is not important in the case of DC power. The terminal PE is only as an anti­interference terminal.

Analog Inputs

The rated voltage (100, 230, 400, 480 VAC) is selected by order. Terminals are designed for connection of
either phase-to-phase or phase-to-neutral voltage measurement. For connection see wiring diagram.

Output Relays

See wiring diagram. Relays on figure are without supply voltage (failure situation)