User Documentation

ManualsBrandsWeidmueller ManualsAutomation & SoftwarePOWER MONITOR 51A

Operating instructions

Power Monitor 51A

Power Monitor 51A 1470260000

Front view / Rear view

Item indication

Sub-indication

Log indication

Keys

Measured value

Unit

Lock mark

Alarm indication

Load ratio indication

TX/RX mark

Pulse output

Pulse input

Terminal block A

Terminal block B

Terminal block C

Battery label

Backup battery

Mounting bracket

USB port

Please remove and

throw away the

battery according to

the instruction of your

area when throwing

the product.

Mounting

(unit: mm)

(tolerance: ±1.0)

Mounting bracket

Terminal

block A

Terminal

block C

Terminal block B

Mounting screw: M4×10

Display

□ 96

(45.7)

(70.4)

(25.6)

(68)

□ 91 ±0.4

Panel cut-out Panel mounting

92 ±0.5

1) Remove the mounting clips from the

unit.

2) Insert the unit from the front of the

panel.

3) Attach the mounting clips at the both

side of the case and secure in place

with the screws. (Tightening torque:

app. 0.2 to 0.3 Nm)

Applicable panel thickness: 1 to 5 mm

Keep enough space for several mountings. Recommended space: 130mm the left, right, top and bot-

tomfrom center of the unit.

Electrical connections

Be sure to wire correctly in accordance with the terminal arrangement and wiring diagrams.

Please connect a fuse or a breaker to the power supply part for safety reasons and to protect the de-

vice.

It does not feature a built-in power switch, circuit breaker or fuse for measured voltage input parts.

They should therefore be installed in the circuit near this unit.

Do not turn on the power supply or input until all wiring is completed.

Never remove the terminal block while applying current to load. It might cause electric shock or CT

breakdown.

Terminal block A

Terminal no. 1 2 3 4 5 6 7 8 9 10

Functions L + N – V1 V2 V3 Vn NC GND D+ D-

AUX

(Power supply)

Measured voltage input

unas-

signed

RS485

Terminal block B

Terminal no. 1 2 3 4 5 6 7 8

Functions

K L K L K L K L

CT1 CT2 CT3 CTn

Measured current input

Terminal block C

Terminal no. 1 2 3 4 5 6 7 8

Functions

OUT1 COM1 OUT2 COM2 IN1+ IN1- IN2+ IN2-

Output 1 Output 2 Input 1 Input 2

Input voltage to each terminal

Terminal Phase and wire system Terminal no. Input voltage

Power supply Single-phase two-wire 1 - 2

85 - 264 V AC

100 - 300 V DC

Measured voltage input

Single-phase two-wire 3 - 6

0 - 500 V AC

Single-phase three-wire 3 - 5 - 6

Three-phase three-wire 3 - 5 - 6

Three-phase four-wire 3 - 4 - 5 - 6

Applicable wire (crimp-type terminal is recommended)

Stripping length: 7 to 8 mm

Power supply /

Measured voltage /

RS485 communication

CT Input

(measured current)

Input / Output

Terminal block A B C

Screw size M2.5 M2.5 M2

Tightening torque 0.4 to 0.5 Nm 0.4 to 0.5 Nm 0.2 to 0.25 Nm

Terminal cross-section

single/stranded wire

1 pc.

0.5 to 4 mm

(AWG20 to 12)

0.5 to 4 mm

(AWG20 to 12)

0.5 to 1.5 mm

(AWG20 to 16)

2 pcs.

0.5 to 2 mm

(AWG20...14)

NOTICE

• Use shielded cable for RS485 communication.

• Use applicable cable according to the measured current.

Applicable ferrules (by Weidmüller)

Wire size 0.75 mm

1.25 mm

2 mm

1 pc.

Name H0.75/14D GR H1.5/14D SW H2.5/15D BL

Part number 9019040000 9019120000 9019160000

2 pcs. *

Name H0.75/14D ZH GR H1.5/16D ZH SW

–

Part number 9037410000 9037470000

*Only for terminal block A and B. It can not be used for terminal block C.

Wiring diagram

• Recommended breaker: 3 to 15 A

• Recommended fuse: Time-lag fuse rated current 2 A

1P2W

Terminal block A (upper) Terminal block B (lower)

Breaker

(To measure

3-circuit)

(To measure 3-circuit)

AUX

(Power supply)

Power

supply side

Load side

CT1 CT2 CT3

L1(R)

L+

N-

V1 V2 V3 Vn

NC SG

D+ D-

CT1

CT2

CT3

CTn

1234 6789 12345678510

1P3W

3P3W

Terminal block A (upper) Terminal block B (lower)

Breaker

AUX

(Power supply)

Power

supply side

L+

N-

V1 V2 V3 Vn

NC SG

D+ D-

CT1

CT2

CT3

CTn

1234 6789 12345678510

CT3

L1(R)

L2(N/S)

L3(T)

CT1

Load side

XXXXX

3P4W

Terminal block A (upper) Terminal block B (lower)

Breaker

AUX

(Power supply)

Power

supply side

L+

N-

V1 V2 V3 Vn

NC SG

D+ D-

CT1

CT2

CT3

CTn

1234 6789 12345678510

Connect CTn to measure N-phase.

CTn is not necessary for normal measurement.

CT1

CT2

CT3

L1(R)

L2(S)

L3(T)

CTn

(To measure

N-phase)

Load side

XXXXXX

Voltage Transformer (VT) connection

VT (Voltage Transformer)

L1(R)

L2(S)

L3(T)

Breaker

AUX

(Power supply)

ＸＸ

Terminal block A (upper)

1 2 3 4 5 6 7 8 9 10

Current Transformer (CT) connection

• Use a CT with a secondary side current of 5 A or 1 A, the rated burden 0.5 VA or more.

• One CT is needed for one unit when measuring 1P2W (2 CTs for 2 circuits, 3 CTs for 3 circuits). Two

CTs are needed when measuring 1P3W/3P3W. Three CTs are needed when measuring 3P4W.

• Use the appropriate or it might cause a breakdown, burnout or electric shock.

• WhenconnectingtheCT,connectthesecondarysidetotheterminalofthemainunitrst,thenwire

the primary side to a load electric wire. Not keeping to this sequence may cause an electric shock or

CT breakdown.

• The CT has polarity. Wire correctly in accordance with the K and L marks. Wiring in the wrong direc-

tion will result in incorrect measurement.

• If harmonic or waveform distortion occurs, measurements may be inaccurate. Please check the cur-

rent system before adopting it.

• Separate the wiring (strong electric part) of the measured voltage input terminal (operating power

supply terminal) from the CT cable. It may not satisfy the accuracy requirements due to noise.

How to connect the CT

(1) Power off the measured devices.

(2) Install the appropriate CT.

(3) Remove terminal block of Power Monitor 51A.

(4) Connect the CT to the terminal block.

(5) Insert the terminal stand securely.

(6) After ensuring that all the wiring is correct, turn on the power of the load and

Power Monitor 51A.

Power supply

Breaker

Load

Primary side current

Secondary side current

Ammeter etc.

without

Ammeter

(3) (4) (5)

(2)

(1) (6)

• Connect CT wiring and terminal block securely,

otherwise it will cause a CT breakdown.

• Never remove the terminal block while applying

current to load. It might cause electric shock

or CT breakdown.

CT (secondary current 1A or 5A)

RS485 connection

RS485 communication wiring

Terminal

device

Terminal

device

Correct

Not correct

Terminal block A

(upper)

Class D

120 Ω

1/2 W or more

Upper device

RS485 device

GNDGND

8 9 10

Terminal block A

(upper)

8 9 10

D++

‒

D‒ GND D+ D‒

For terminal stations of both side including the upper device, termination resistors should be connected.

Connect120Ω,½Wormoreterminationresistorbetween[D+]and[D-]ofthePowerMonitor51Athat

is connected to the end of RS485 transmission line.

Connection of Power Monitor 51A and the other devices with 2-wire

Except Power Monitor Power Monitor terminal

class D

120 Ω

1/2 W or more

Terminal device

except Power Monitor

terminal connection

To RS485 device

Shielded cable

Short-circuit [–] to [E].

* Do not connect

shielded cable to [E].

* Do not connect

shielded cable to [E].

* Connect

Power Monitor

Terminal TerminalExcept terminals

E+

–

D+GNDD–

E+–

Input connection

Pulse input

•

IN+

5 or 7

IN–

6 or 8

Photo-

coupler

Internal circuit

Contact input

Use highly reliable metal plated contacts. Since the contact’s

bounce time results directly in an error in the count value, use

contacts with as short a bounce time as possible. In general, se-

lect 30 Hz for max. counting speed.

• Non-contact input (transistor input)

Connect with an open collector. Use the transistor with the fol-

lowingspecications:

CEO min

= 20 V / I

C min

= 20 mA / I

CBO max

=6μA

Use transistors with a residual voltage of less than 3 V when the

transistor is ON.

Notes

Short-circuitimpedanceshouldbelessthan1kΩ.

Open-circuitimpedanceshouldbemorethan100kΩ.

The short-circuit leakage current is about 10 mA.

• Input wiring

Please wire as short as possible by using a shielded wire or a metallic electric wire tube individually.

Output connection

PhotoMOS relay output

•

OUT

COM

1 or 3

2 or 4

Internal circuit

It adopts PhotoMOS relay output, there is no polarity.

• Please wire less than 100 m for output.

• Output rated capacity: 30 V AC/DC, 0.1 A)

Weidmüller Interface GmbH & Co. KG

Klingenbergstraße 16

D-32758 Detmold

Phone +49 (0) 5231 14-0

Fax +49 (0) 5231 14-292083

info@weidmueller.com

www.weidmueller.com

Safety instructions

NOTICE

• Read these instructions carefully to ensure proper installation.

• After installation, keep them in a safe place for future reference.

• Power Monitor 51A is designed primarily for managing energy-saving. It

is neither intended nor can it be legally used for billing.

• Power Monitor 51A is designed to be installed in a control panel.

WARNING

• PleaseusePowerMonitor51Aaccordingtothespecicationsdescribed.

Otherwise,itmaymalfunctionorcausereandanelectricshock.

◊ Connect Power Monitor 51A to the power supply in compliance with

the rating.

◊ Refer to the wiring diagram to ensure proper wiring for the power

supply, input and output.

◊ Use an electric wire that is appropriate for the rated current.

◊ Do not perform wiring or installation with a live line. This may result in

circuitburnoutorrebywayofthesecondaryCTsideopening.

• Do not connect the voltage input, current input or pulse input wires

parallel to high-voltage or power cables and avoid using the same

conduit. Keep the length of shielded wires as short as possible.

• Do not turn on the power supply or input until all the wiring is completed.

• Do not use the secondary side circuit of inverter. It might cause

exothermic heat or damage.

• If additional noise effects the power supply line, voltage input line or

current input line, incorrect measurements may result.

• Installation and wiring electrical work or electric piping must be

performed by specialist personnel.

• Please wipe dirt off the main unit using a soft cloth etc. Using thinner

might result in deformation or discolouration of the unit.

• Do not add an excess power to the display. It might break the inner liquid

crystal.

• For your safety ensure that the following conditions are met:

◊ Overvoltage category II and pollution degree 2

◊ Indoor use

◊ Ambient temperature of -25 to +55 °C

◊ Ambient non-condensing humidity of 30 to 85% RH (at 20 °C)

◊ Altitude of 2000 m or less

• Do not use in the following environments:

◊ Where it will be exposed to direct sunlight

◊ Whereinammableorcorrosivegasmightbeproduced

◊ Where it will be exposed to excessive airborne dust or metal particles

◊ Where it will be exposed to water, oil or chemicals

◊ Where direct vibration or shock might be transmitted

◊ In the vicinity of high-voltage cables, power lines or machinery where

large switching surges may occur Always use current transformers for

galvanic isolation to measure currents.

• Always use current transformers for galvanic isolation to measure cur-

rents.

1481410000/01/10.16

Summary of content (3 pages)

PAGE 1
Applicable wire (crimp-type terminal is recommended) Stripping length: 7 to 8 mm Front view / Rear view A Load ratio indication Power supply / Measured voltage / RS485 communication Alarm indication Lock mark Item indication Sub-indication Log indication Unit Input / Output • • A B C Screw size M2.5 M2.5 M2 0.4 to 0.5 Nm 0.4 to 0.5 Nm 0.2 to 0.25 Nm 0.5 to 4 mm (AWG20 to 12) 0.5 to 1.
PAGE 2
J Password K Entering a password You must enter a password to switch to setting mode. Enter [0000] and change to password setting mode when you set the password at the first time. NOTICE When setting a password, enter it carefully and remember to make a note of it. Parameter settings Make setting before measuring Select setting item with flash. Set with ITEM and SHIFT ITEM and press , the value will SET Increase . Select [YES] in the confirmation window and press confirm the setting values.
PAGE 3
de Sicherheitshinweise HINWEIS • Lesen Sie die vorliegenden Anweisungen sorgfältig durch, um eine ordnungsgemäße Installation zu gewährleisten. • Bewahren Sie die Anleitung nach der Installation an einem sicheren Ort auf, um im Bedarfsfall darauf zurückgreifen zu können. • Der Power Monitor 51A ist in erster Linie für das Management von Energieeinsparungen konzipiert. Er ist weder für Abrechnungszwecke bestimmt noch kann er aus rechtlichen Gründen hierfür verwendet werden.