Electrical Installation. Satec PM172EH Series

2.2 Electrical Installation

)

Before installation ensure that all incoming power sources are shut OFF. Failure to observe this practice can result in serious or even fatal injury and damage to equipment.

Connections to the PM172EH are made via terminals located on the rear panel of the instrument as shown in Figure 2-6.

26 27 28 29 18 19 20

V

V

1

2

18 19 20

1 2

STATUS INPUT

2

5

8

21 22 23 24 25

+ +

2

-

1

ANALOG OUTPUT

26

1

27 28

2

29

RELAYS

R

POWER SUPPLY

90-264VAC

50/60Hz

STANDARD

85-290VDC

10W

NOM. VOLT. MEASUREMENT

690V

O

120V (OPT. U)

(12) 10-16VDC

P

(24) 18-36VDC

LOW DC

INPUT

T

1A CT.

5A CT.

(48) 36-72VDC I

ANALOG OUTPUT

S/N

O

COMM. PROTOCOL

N

ASCII & MODBUS

SW. VER

S ASCII & DNP3.0

-

+

-

-

+ 1

I

1

3

4

I

2

6

+ 7

I

3

9

V

11

V

3

N

ATTENTION

Static-Sensitive

Devices

Handle Only at

Static-Safe

Workstations

COM.1

RS-232

5

9

RS-422/485

6

1

N/10

POWER SUPPLY

COM.2

RS-422/RS-485

-TX -RX +TX +RX

L/+ 12

13 14 15 16 17

13 14 15 16 17

00-06007

Figure 2-6 Terminals - Rear View

2.2.1 Power Source Connection

The power source can be dedicated-fused, or from a monitored voltage if it is within the instrument’s power supply range.

AC power supply: line to terminal 12; neutral to terminal 10.

DC power supply: positive to terminal 12; negative to terminal 10.

Chapter 2 Installation 11

2.2.2 Current Inputs

To ensure accurate readings, the input current should not exceed 1.2A

RMS and 1.76A amplitude for the 1A CT secondary, or 6A RMS and 8.8A amplitude for the 5A CT secondary.

Copper wiring 2.5 – 3.5 mm 2 (12 AWG) should be used.

2.2.3 Ground

Connect the chassis ground of the PM172EH to the switchgear earth ground using dedicated wire greater than 2 mm

2

/14 AWG.

2.2.4 Voltage Inputs

Input of 690V (Standard): To ensure accurate readings, the measured voltage between terminals 2-5, 5-8 and 8-2 should not exceed 790V AC

RMS, and the measured voltage between terminals 2-11, 5-11 and 8-11 should not exceed 460V AC RMS and 695V amplitude. Use any of the seven wiring configurations shown in Figures 2-7 through 2-13.

Input of 120V (Option U): To ensure accurate readings, the measured voltage between terminals 2-5, 5-8, 8-2, 2-11, 5-11 and 8-11 should not exceed 144V AC RMS and 225V amplitude. 120V input usually implies use of a potential transformer (PT). The PT requires use of any of the four wiring configurations shown in Figures 2-9 through 2-12.

Wiring Configuration

(See parameter setup instructions in Section 4.2)

3-wire direct connection using 2 CTs (2-element)

4-wire WYE direct connection using 3 CTs (3-element)

4-wire WYE connection using 3 PTs, 3 CTs (3-element)

3-wire open delta connection using 2 PTs, 2 CTs (2element)

Setup Code Figure

3dir2 2-7

4Ln3 or 4LL3 2-8

4Ln3 or 4LL3 2-9

3OP2 2-10

4-wire WYE connection using 2 PTs, 3 CTs (2½ -element) 3Ln3 or 3LL3 2-11

3-wire open delta connection using 2 PTs, 3 CTs (2½ element)

3OP3 2-12

4-wire delta direct connection using 3 CTs (3-element) 4Ln3 or 4LL3 2-13

12 Chapter 2 Installation

Figure 2-7 Three Wire Direct Connection Using 2 CTs (2-element)

Wiring Mode = 3dir2

LINE 1 (A)

LINE 2

LINE 3

(B)

(C)

N

K

+ -

L

K

+ -

L

K

+ -

L LOAD

Shorting

Switches

Voltages

V

1

V

2

V

3

Currents

1

+

3

-

4

6

+

-

7

+

9

-

10

V

N

12

Figure 2-8 Four Wire WYE Direct Connection Using 3 CTs (3element) Wiring Mode = 4LL3 or 4Ln3 c99-05030

Chapter 2 Installation 13

Figure 2-9 Four Wire WYE Connection Using 3 PTs, 3 CTs (3element) Wiring Mode = 4LL3 or 4Ln3

Figure 2-10 Three Wire Open Delta Connection Using 2 PTs, 2

CTs (2-element) Wiring Mode = 3OP2

14 Chapter 2 Installation

Figure 2-11 Four Wire Wye Connection Using 2 PTs, 3 CTs

(2½-element) Wiring Mode = 3LL3 or 3Ln3

This configuration will provide accurate power measurements only if the voltages are balanced.

Figure 2-12 Three Wire Open Delta Connection Using 2 PTs, 3 CTs

(2½-element) Wiring Mode = 3OP3

Chapter 2 Installation 15

LINE 1(A)

LINE 2(B)

LINE 3(C)

*

L

1

*

L

1

(A)

240VAC

*

L

2

240VAC

240VAC

*

L

3

120VAC

208VAC

N

*

*

L

3

120VAC N

(C)

K

+ -

L

K

+

-

L

K

+ -

L

LOAD

N

Shorting

Switches

Grounded delta connection

*

L

1

(A)

120V

*

L

2

(B)

120V

*

L

3

(C)

Voltages

2

5

8

V

1

V

2

V

3

11 V

N

Currents

1

+

-

3

4

6

7

-

+

9

10

12

N

VOLTAGES DISPLAYED:

1. Line to neutral voltages: 120V; 208V; 120V.

2. Line to line voltages: 240V; 240V; 240V.

Figure 2-13 Four Wire Delta Direct Connection Using 3 CTs

(3-element) Wiring Mode = 4LL3 or 4Ln3

2.2.5 Relays

c99-05031

Two relays are provided for energy pulsing, alarms or remote control.

Figure 2-14 Relays Connection

2.2.6 Status Inputs

Two optically isolated status inputs are provided for status monitoring, counting pulses and for external power demand period and time synchronization.

Figure 2-15 Status Inputs Connection

16 Chapter 2 Installation

2.2.7 Analog Output

The PM172EH provides two optically isolated analog outputs with an internal power supply and current output options of 0-20 mA and 4-20 mA

(current loop load of up to 500 Ohm), 0-1 mA and ± 1 mA (current loop load of 10 kOhm).

Figure 2-16 Analog Output Connection

Chapter 2 Installation 17