APC MW II User Manual

Installation

®

Symmetra

MW II

1200 kW

400 V

X017

X012

X008A

X014B

X013

X014A

X008B

X011

X010

X405

X007

X021

X022

Normal

Normal

UPS Summary

~~

Contents

Safety ......................................................................1

IMPORTANT SAFETY INSTRUCTIONS

- SAVE THESE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Symbols used in this guide . . . . . . . . . . . . . . . . . . . . . . . . . 1

Installation safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

System Overview......................................................3

UPS Sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Serial number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Inverter Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Control/Input/Output Section . . . . . . . . . . . . . . . . . . . . . . . 3

External Bypass Static Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Serial number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Electrical Installation ................................................5

Typical UPS Wiring Principle . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Power wiring overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

External disconnection switches . . . . . . . . . . . . . . . . . . . . . 6

Input/Output wiring precautions . . . . . . . . . . . . . . . . . . . . . 6

AC and PE cable connections . . . . . . . . . . . . . . . . . . . . . . . 7

Battery cables connection . . . . . . . . . . . . . . . . . . . . . . . . . . 8

External Bypass Static Switch Wiring . . . . . . . . . . . . . . . . . . . . 10

Top cable entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Communication cable overview . . . . . . . . . . . . . . . . . . . . . . . . 12

Relay Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Location of relay boards . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Communication cables with optional Relay Board . . . . . . . . . 13

Relay board 1 connections . . . . . . . . . . . . . . . . . . . . . . . . 14

Relay board 2 connections . . . . . . . . . . . . . . . . . . . . . . . . 15

Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-001 i

Specifications ........................................................ 17

Low-Impedance/High-Impedance Earthing. . . . . . . . . . . . . . . . 17

Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

AC Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

DC Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

AC Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

AC Input External Bypass SSW . . . . . . . . . . . . . . . . . . . . . 19

Heat dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Torque specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Required Breaker Settings (400 V Systems) . . . . . . . . . . . . . . . 20

Input and upstream breakers . . . . . . . . . . . . . . . . . . . . . . 20

Output and downstream breakers . . . . . . . . . . . . . . . . . . . 21

Appendix .............................................................. 23

System and Protective Earthing . . . . . . . . . . . . . . . . . . . . . . . . 23

TN Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Reference to IEC 60364-4-41 413.1.3 . . . . . . . . . . . . . . . . . 23

Reference to IEC 60364-5-54 546.2.3 . . . . . . . . . . . . . . . . . 23

Additional requirements for generating sets
(IEC 60364-5-55 551.4.2)

Protective devices in TN systems . . . . . . . . . . . . . . . . . . . . 24

. . . . . . . . . . . . . . . . . . . . . . . . . 24

TT Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Reference to IEC 60364-4-41 413.1.4 . . . . . . . . . . . . . . . . . 25

Protective devices in TT systems . . . . . . . . . . . . . . . . . . . . 25

IT Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Reference to IEC 60364-4-41 413.1.5 . . . . . . . . . . . . . . . . . 26

Protective devices in IT systems . . . . . . . . . . . . . . . . . . . . . 27

ii Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-001

Safety

IMPORTANT SAFETY INSTRUCTIONS

- SAVE THESE INSTRUCTIONS

This guide contains important instructions for SYMF1200KH that should be followed when handling the
UPS, External Bypass Static Switch, Battery Enclosures, and Batteries.

Symbols used in this guide

Warning: Indicates an electrical hazard, which, if not avoided, could result in injury or

death.

Caution: Indicates a hazard, which, if not avoided, could result in injury or death.

Note: Indicates important information.

Indicates that more information is available on the subject.

Main Protective Earthing Terminal symbol.

Ground symbol.

Installation safety

Press the optional EPO (Emergency Power Off) button to switch off all AC and DC power

EPO

supply to connected equipment in the room and to cut off the load supply. The EPO is

typically located on a wall in the room in which the UPS is installed. See “Communication

cable overview” section for information on how to wire the UPS to the EPO.

Warning: Before you start the installation, verify that all AC and DC power source
breakers are in the open position.

Warning: Only personnel trained in the construction and operation of the equipment,
and the electrical and mechanical hazards involved, must install or remove system
components.

1Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-001

Warning: Do not use high voltage testing equipment as it will destroy the electronic

circuits in the units.

Caution: The system is equipped with an optional auto-start function enabling the system to
start without any warning when power is applied.

Caution: All wiring to be in accordance with applicable national and/or local electrical
wiring rules.

This unit contains components that are sensitive to electrostatic discharge (ESD). Follow
proper ESD procedures to avoid severe damage to electronic components.

Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-0012

System Overview

UPS Sections

The UPS system consists of two 600 kW Inverter Sections, a Control/Input/Output Section and an
External Bypass Static Switch Section.

Serial number

The serial number is stated on the type label behind the finishing panel above the display unit. Remove
finishing panel as described in “Appendix C” to see serial number.

Inverter Section

The Inverter Sections regulate the UPS output and operates from battery power in the event of mains
input loss.

Control/Input/Output Section

The Control/Input/Output Section controls and monitors the UPS and contains the input/output
terminations.

Control/Input/Output SectionInverter Section

Width:

1268 mm

Width:

2110 mm

Total width of UPS sections:

4646 mm

Weight:

Without Power Modules: 5301kg
With Power Modules: 6324 kg

X017

X012

X008A

X014B

X013

X014A

X008B

X011

X010

X405

X007

X021

X022

Normal

Normal

UPS Summary

~~

2032 mm

m

m

7

6

0

1

Inverter Section
Width:

1268 mm

3Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-001

External Bypass Static Switch

The External Bypass Static Switch (External Bypass SSW) transfers the load (manually or
automatically) from the UPS to an alternate source without interrupting the supply to the load.

Normal

~~

2032 mm

1067 mm

2 MW External Bypass Static Switch

Width:

1014 mm

Weight:

636 kg

Serial number

The serial number is stated on the type label behind the finishing panel above the display unit. Remove
finishing panel to see serial number.

Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-0014

Electrical Installation

Typical UPS Wiring Principle

Power wiring overview

See separate guide on parallel operation for wiring overview in parallel systems.

Batteries 1

Battery Breaker Box 1

6

Symmetra MW

9

9

Batteries 2

Battery Breaker Box 2

6

External Bypass Static Switch

= CABLING PROVIDED BY OTHERS

DC CABLING SHOULD BE SEGREGATED FROM AC CABLING

SEE BATTERY INSTALLATION INFORMATION

POWER WIRING AND CONTROL WIRING MUST BE SEGREGATED.

AC CIRCUIT CABLE LENGTHS (INPUT AND OUTPUT) SHOULD BE EQUAL ON ALL MODULES

DC CIRCUIT CABLE LENGTHS SHOULD BE EQUAL ON ALL MODULES

8.

9.

10.

INSTALLATION MUST COMPLY WITH NATIONAL AND LOCAL ELECTRICAL RULES.

11.

12.

13.

14.

Maintenance Bypass Panel (MBP)

MAINS

MAINS SOURCE 3X400/230V TN-S (PROVIDED BY OTHERS).

Q1 - Q6 WITH 2NO/2NC AUXILIARY CONTACTS.

Q7, Q8 DC RATED THERMAL MAGNETIC TRIP MOLDED CASE CIRCUIT BREAKER.

WITH 24VOLT DC UNDER VOLTAGE RELEASE (UVR) AND 2NO/2NC AUXILIARY CONTACTS.

1.2.3.4.5.

SEE THE INSTALLATION GUIDE FOR THE BREAKER SETTINGS OF Q1, Q3, Q4 AND Q5.

ALL AC POWER CABLING IS L1,L2,L3,N,PE.

UPS INPUT AND OUTPUT CONDUCTORS MUST BE IN SEPARATE CABLE RUNS.

UPS AND STATIC BYPASS WITHSTAND RATING, Icw = 200 KA

6.

7.

5Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-001

External disconnection switches

Warning: The UPS has no built-in disconnect devices to switch off external AC (Q1 and

Q5) and DC (Q7 and Q8) input power. Ensure that the disconnect devices are available
as separate components for this installation.

Note: The installer must provide each external disconnect device for this UPS system with
labels displaying the following text: “Isolate the Uninterruptible Power Supply (UPS) as
instructed in the User Guide before working on the circuit.”

Input/Output wiring precautions

Warning: Only personnel trained in the construction and operation of the equipment,

and the electrical and mechanical hazards involved, must install or remove system
components.

Warning: Before you start the installation, verify that all AC and DC power source
breakers are in the open position.

Warning: Supply the UPS from a 3 × 400/230 V, L1, L2, L3, N, PE source or a high­impedance grounded system.

Caution: All wiring to be in accordance with applicable national and/or local electrical
wiring rules.

Note: Use only copper conductors.

Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-0016

AC and PE cable connections

y

Top view of
top cover

For battery
grommets







For AC and PE
grommets

For AC and
PE
grommets





N

Normal

UPS Summar

~~





L1 IN

L1 OUT

L2 IN



L2 OUT

L3 IN

L3 OUT

 

Note: No drilling or cutting should take place over the top of the UPS.



7Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-001

1. With the top covers removed, drill holes for AC, PE and Battery grommets in areas shown.

2. Re-fit the covers and install the grommets.

3. Feed AC and PE cables through grommets in the Control/Input/Output Section.

Hole distance DC

Cable lug

44.45 mm

35.8 mm

4. Connect PE cable.

5. Connect AC IN cables to normal power and bypass power.

6. Connect AC OUT cables.

Battery cables connection

Warning: Make sure that the battery breakers are open (OFF) prior to running the

cables.

Caution: For battery installation and maintenance instructions, refer to the battery
manufacturer’s installation manual.

Caution: Over-current protection for the battery circuit is required by code. The minimum
DC voltage rating of the battery supply over-current protection device is 500 V.

Busbar

44.45 mm

fl 13

Cable lug

Hole distance AC

44.45 mm

58 mm

Busbar

44.45 mm

fl 13

Hole distance grounding

Cable lug

44.45 mm

46.99 mm

Busbar

44.45 mm

M10 stud

Note: Over-current protection for the battery circuit is required by national wiring rules.

Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-0018



X017

X012

X008A

X014B

X013

X014A

X008B

X011

X010

X405

X007

X021

X022

UPS Summary

Normal

Normal

~~



BAT1 + BAT2 -



BAT1 - BAT2 +

1. Feed the battery cables through the grommets.

2. Connect battery cables to Bat 1+ and Bat 1-.

3. Connect battery cables to Bat 2+ and Bat 2-.

Note:The battery cables can be connected on either side of the busbar.

9Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-001

External Bypass Static Switch Wiring

Warning: Before you start the installation, verify that all AC and DC power source

breakers are in the open position.

Warning: Use only manual reset protection as input over-current protection.

Warning: Over-current protection required by national wiring rules.

Warning: The UPS has no built-in disconnect devices to switch off external AC (Q1 and

Q5) and DC (Q7 and Q8) input power. Ensure that the disconnect devices are available
as separate components for this installation.

Caution: The External Bypass Static is not provided with built-in backfeed protection. Use
suitable breakers with a minimum of 0.8 in/20 mm air gap and trip function. The breaker is
controlled from the External Bypass SSW and will be tripped in case of backfeed.

Note: The installer must provide each external disconnect device for this UPS system with
labels displaying the following text: “Isolate the Uninterruptible Power Supply (UPS) as
instructed in the User Guide before working on the circuit.”

Note: The installation of the External Bypass Static Switch must comply with local and
national regulations.

Note: Run matched set of phase cables in the same cable run(s). Do not separate phases into
different cable runs.

Note: Use only copper conductors.

Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-00110

Top cable entry

Top view of top cover



Top view of input and output



L1 IN

L1 OUT

L2 IN

L2 OUT



L3 IN

L3 OUT







X017

X012

X008A

X014B

X013

X014A

X008B

X011

X010

X405

X007

X021

X022

L1 OUT

L2 IN

L2 OUT

L1 IN

UPS Summary

L3 IN

~~

L3 OUT

Normal

Normal



Side view of PE
busbar.

1. Loosen the 8 bolts to remove top cover.

Note: No drilling or cutting should take place over the top of the UPS.

2. Drill holes for grommets.

3. Re-fit the covers and install the grommets.

4. Feed the cables through the grommets. Connect cables at cable connection points.

5. Connect Protective Earth conductor to busbar locations.

11Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-001

Communication cable overview

y

A

External Bypass Static Switch

e
n
a

l
p

n
o

i

t
c
e

0P0957

n
n
o
C

B

B

6

7

2

2

1

1

X

X

X126A

X127A

UPS

X134A

EPO out

X177

0P0957

Connection plane

X131

B

X133A

B

6

7

2

2

1

1

X

X

A
6
2
1
X

X130

X128

A
7

X129

2
1

Backfeed protection

X

EPO out

X185

21

X134A

X177

1

2

2

1

2

1

X131

X130

X128

X129

Terminator

0N-0765

X134A
1

2

Q

6

Q

5

play)

EMO (Dis

1

2

1

2

External

EPO

12

placed on

wall

EMO (Displ ay)

Q

4

Q

3

2

Q

1

Q

Terminator

0N-0765

612345

871091211

X134B

X134A

1

2

1

2

1

2
1
2

X173

2

12
11

4

X177

X128

X129

10

9

8

s

7

r
e

3

P

k

7

B

a

1

6 5

e

M

X

r
B

3 2

2

1

1

X177

s

r

e

P

k

B

a

e

M

r

B

X128

X129

1

1

2

X134B

4

5

3

+-+-+ -+-

H4

H3

21

5

43

MBP CAN I/O board1

Norm.op

X175

1

2

Relay output

Note 3

Maintenance Bypass Panel

Relay output

1

2

X175

Norm.op

MBP CAN I/O board 2

0P4533

142

X170

Note 3

Lamps

X172

10

8

6

7

6

Q7

11

9

H6

H5

X172

Lamps

109

0P4533

Maintenance Bypass Panel

Q8

+-+-

12 34

4

X182

2 3

X180

Battery CAN I/O board

1

X185

12

X133A

X133B

0P4512

2

1

3

12

+- +-+ -

Q5

121187

1

X170

Earth fault sensor

X174

2

1

H7

H8

1

3

2

X183

ID 0

X186

78

1

2

X174

Earth fault sensor

X176
3412

56

Q6

+

Externa l Lamp

V r V o

suppl

DC DC

Max. 250V 5A

-

4

2

3

X178

X176

4

4

31

2

X184

42
31

X181

4

3

8
7
1

2

X

1

24V
Shunt trip for
back feed
protection

C

Note 1

-

4

3

+

-

21

+

6

-

5

+

4

-

3

+

2

-

1

+

Shunt trip

Note 2

-

+

-

+

Temp sen sor

-

+

Temp sen sor

-

+

Note 1

-

C2

+

-

C1

+

DC

C2

C1

Q2

Q1

24V

DC

UVR

Q8

UVR

Q7

NTC

NTC

Fuse234Fuse356Fuse4

Fuse1

Note 1: Contact APC Application Team for correct
sizing.

Note 2: H7, H8 = 2V LED
Note 3: Q2, Q4 and Q6 are optional. If Q2 is not

present pins 3 and 4 must be shorted on both boards.
If Q4 is not present pins 7 and 8 must be shorted on
both boards. If Q6 is not present pins 11 and 12 must
be shorted on both boards.

Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-00112

Relay Boards

A

A

Location of relay boards

Relay boards

UPS Summary

Normal

~~

Communication cables with optional Relay Board

Backplane X008

Fan CAN X008

13Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-001

Relay board 1 connections

Relay Function Mode Special Comments

Output 1 Common alarm Fail safe

Output 2 Normal operation Active on

Output 3 Bypass operation Active on

Output 4 Battery operation Active on

Output 5 V

out of tolerance Fail safe

DC

Output 6 Battery conditon fault Fail safe Battery fault detected by

battery monitor

Output 7 Maintenance bypass

Active on

operation

Output 8 Mains out of tolerance Fail safe

Output 9 Bypass out of tolerance Fail safe

Output 10 Output out of tolerance Fail safe

Output 11 MCCB open Fail safe Battery breakers open

Output 12 System overload Fail safe

Output 13 Good utility Active on If UPS goes into bypass,

this relay goes on without
delay

Output 14 Boost charge active Fail safe

Output 15 Fan fault Fail safe

Output 16 Temperature fault Fail safe Temperature switch active

or faulty temperature sensor

Input 1 Generator active Master will handle

signal

Input 2 Battery room ventilation

Individual Input for indicating that the

fault

Input 3 DC Ground Fault

Individual

Detection

Input 4 Reserved for future use Master will handle

signal

Input 5 Plant clock

synchronization

Master will handle
signal

Input 6 Power Tie detection Master will handle

signal

Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-00114

Input for indicating that a
generator is active. This will
be used to reduce the charge
power

ventilation in battery rooms
is defect. This will be used
to reduce the charge power

Input for real time clock
synchronization

Input from PLC to detect if
Power Tie is active

Relay Function Mode Special Comments

Input 7 Reserved for future use

Input 8 Reserved for future use

Relay board 2 connections

Relay Function Mode Special Comments

Output 1 Info level alarm Fail safe

Output 2 Warning level alarm Fail safe

Output 3 Severe level alarm Fail safe

Output 4 Input frequency too high Fail safe

Output 5 Input frequency too low Fail safe

Output 6 Output frequency too

high

Output 7 Output frequency too

low

Output 8 Bypass source fault Fail safe

Output 9 Close Q7 pulse Active on No delay

Output 10 Close Q8 pulse Active on No delay

Output 11 Power Tie mode active Active on No delay

Output 12 Close Q2 Fail safe No delay

Output 13 Reserved for future use

Output 14 Reserved for future use

Output 15 Reserved for future use

Output 16 Reserved for future use

Input 1 Reserved for future use

Input 2 Reserved for future use

Input 3 Reserved for future use

Fail safe

Fail safe

Input 4 Reserved for future use

Input 5 Reserved for future use

Input 6 Reserved for future use

Input 7 Reserved for future use

Input 8 Reserved for future use

15Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-001

Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-00116

Specifications

Low-Impedance/High-Impedance Earthing

The Symmetra
grounded system.

In a solid grounded system, the neutral power source (mains, generator, or UPS) is solidly grounded. In
the event of a down-stream ground fault, the fault current will have a path back to the source, and the
over-current device feeding the faulted part of the installation will trip and isolate the fault.

In a high-impedance grounded system, the source is grounded with an impedance (grounding resistor).
In the event of a down-stream fault, the fault current will be limited by the impedance of the grounding
resistor. The value of a high-impedance system is its ability to maintain operation with a given system
fault to ground, i.e. the over-current device will only trip at line-to-line faults or double ground faults.
For a high-impedance system to provide enhanced power system reliability and availability, a ground­fault monitoring/alarm system is required.

®

MW is easily integrated into either a solid grounded system, or a high-impedance

Note: Grounding electrode conductor to be supplied by the customer.

For more information refer to “Appendix” in Installation Guide.

Electrical Specifications

Warning: Supply the UPS from a dedicated, 3 × 400/230 V, L1, L2, L3, N, PE source or

a high-impedance grounded system.

Caution: Ensure clockwise phase rotation (L1, L2, L3) of input voltages.

Caution: AC and DC disconnect switches and overcurent protection must be included in the

installation.

Note: All wiring must comply with all applicable national and/or local electrical codes.

Note: Max. prospective RMS short-circuit current on input terminals: 200 kA

Max. prospective RMS short-circuit current on DC terminals: 50 kA

17Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-001

AC Input

AC Input

Input rating 1200 kW/kVA

Power Factor 1

Input Voltage 380 V

Input Frequency 50 Hz

Nominal input current (note 1) 1698 A

Input Current Limitation (note 2) 2133 A

Input Voltage 400 V

Input Frequency 50 Hz

Nominal input current (note 1) 1793 A

Input Current Limitation (note 2) 2200 A

Input Voltage 415 V

Input Frequency 50 Hz

Nominal input current (note 1) 1728 A

Input Current Limitation (note 2) 2170 A

DC Input

DC Input

Nominal Voltage (note 3) 2 x 384 V

I

Discharge (note 4) 1628 A

Nom

I

Discharge (note 5) 1929 A

Max

Caution: Over-current protection for the battery circuit is required by code. The minimum
DC voltage rating of the battery supply over-current protection device is 500 V.

Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-00118

AC Output

AC Output

Vol t a g e 38 0 V

Current Nom (note 8) 1641 A

Max (note 7) 2051 A

Voltage 400 V

Current Nom 1732 A

Max (note 7) 2165 A

Voltage 415 V

Current Nom 1669 A

Max (note 7) 2087 A

AC Input External Bypass SSW

The External Bypass SSW is designed to accommodate a continuous overload of 25%.

AC Input External Bypass SSW

External Bypass SSW Max Input Current (100% load)

380 V 1641 A

400 V 1732 A

415 V 1669 A

Heat dissipation

37.1 kW / 126.7 kBTU/hr (note 6).

Notes

1. Nominal (Nom): Input current based on rated load, nominal input voltage and fully charged
batteries.

2. Current limitation is maximum allowed via electronic current limiting and is based on full battery
recharge + nominal load and -10% input voltage.

3. Nominal battery voltage assumed to be 2.0 volts/cell (lead technology).

4. Nominal Battery Discharge current based on rated load, and nominal Battery voltage.

5. Maximum Battery Discharge current based on rated load at end of Discharge.

6. Heat dissipation calculated at rated load capacity.

7. This current is at 125% of rated load and is electronically current-limited to a maximum of 10
minutes. This value is only provided so the engineer can ensure that the selected AC output
circuit overcurrent device’s time-current characteristic will support this condition.

8. At 380 V, nominal output is reduced from 200 kW to 180 kW in each section.

19Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-001

Torque specifications

Torque specifications

Bolt Size M8 13.5 Nm

Bolt Size M10 30 Nm

Bolt Size M12 50 Nm

Bolt Size M14 75 Nm

Required Breaker Settings (400 V Systems)

Note: Contact APC Application Team for Required Breaker Settings in 380 V and 415 V

systems.

The Symmetra® MW is a fault-tolerant system capable of handling and surviving overloads and
internal/external faults. The overload performances and fault clearings are possible when the system
meets specified minimum requirements for breaker settings.

A proper breaker coordination study is required to ensure the highest availability of the UPS. This
breaker coordination study should be performed focusing on maintaining the fault tolerant characteristics
of the Symmetra MW.

The following tables provide the optimum settings for the input and output breakers. The settings are
specified in the tables below, but some of them can also be found in the Electrical Specification section.

See separate manual on parallel operation for information on required breaker settings in
parallel systems.

Input and upstream breakers

Q1, Q5, and any upstream breaker

Duration [S] Current [A] Total load [%] Event/Operation

< 0.005 22 kA -- Internal fault clearing

∞

∞

∞

2200* 127 Overload on-line

1793 100 On-line

1972 110 On-line+ Max. Battery

charge

* In the absence if a coordination study conducted by a professional engineer, the recommended

instantaneous trip setting for breakers Q1, Q2, Q4, Q5, and Q6 is 22 kA

** Only applicable to Q1

Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-00120

Output and downstream breakers

Duration [S] Current [A] Total load [%] Event/Operation

< 0.005 22 kA -- Internal fault clearing.

60 3464* 200 Overload on-line

600 2165* 125 Overload on-line

Q2, Q4, Q6

∞

* In the absence if a coordination study conducted by a professional engineer, the recommended

instantaneous trip setting for breakers Q1, Q2, Q4, Q5, and Q6 is 22 kA

1732 100 On-line

** Only applicable to Q2 and Q4

In the absence of a proper breaker coordination study and if only the actual Ip on the unit’s input
terminals is known, this table must be used to optimize the instantaneous trip setting or to choose a
breaker with a usable fixed instantaneous trip value.

Ip* [kA] I peak let-through [kA] I setting [kA]

200 16 18

140 14 16

100 13 15

50 10.5 12

30 9 11

* Ip = Abridgment for Prospective short-circuit current.

This is the current that would flow in the fault circuit is the fuse was

replaced by a link with an infinitely small impedance

22 kA is the maximum peak let-through current (including safety factor) present during clearing of an
internal fault in a 200 kW section or a power module. This maximum peak let-through current is based
on and applicable to utility with prospective short-circuit currents (Ip) up to 200 kA.During or after a
controlled fault clearing, none of the breakers are allowed to trip on the instantaneous trip setting below
the specified value. This is also applicable to the upstream breakers, and a check of the instantaneous trip
setting in this part of the installation is required.

The instantaneous trip setting calculated by a professional engineer in a breaker coordination study must
not disable the functionality of clearing and surviving an internal fault unless there is a written agreement
between APC by Schneider Electric and the customer.

By ensuring the unit’s fault clearing ability (survival skills) i.e. using the correct instantaneous trip
settings in the switch gear (installation), maximum power availability in normal operation is obtained for
the critical load.

Note: The instantaneous trip setting can be calculated when utility Ip is known. An incorrect
trip setting can result in limiting the system functionality and jeopardize the load support.

21Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-001

Note: The instantaneous trip setting must not be derated even though the UPS system is

derated in system output power. The system size has no influence on the instantaneous trip
setting.

Note: For derated systems, the APC Application Team can provide the correct breaker settings
and breaker frame sizes.

Note: For upstream breakers not mentioned in the table, the APC Application Team can
provide the correct breaker settings for on-line, overload, and trip currents.

The following diagram shows a dual mains system in which the upstream breakers are named
Q. Correct settings of upstream breaker settings are mandatory. The system can also be configured as a
single mains system.

Dual Mains Installation

Q3

T1

Q

Q5

Q6

T2

Q

Q1

Q4Q2

Symmetra MW II 1200 kW 3 x 400/230 V Installation - 990-1979E-00122

Appendix

System and Protective Earthing

The purpose of this appendix is to describe the system- and protective earthing principles of the
Symmetra

®

MW.

Caution: All wiring to be in accordance with applicable national and/or local electrical
wiring rules.

TN Systems

Characteristics

TN systems have one point connected directly to ground. All exposed conductive parts must be
connected to that point by protective conductors.

Depending on the way the neutral and protective conductors are fed, there are three types of TN systems:

• TN-S system: a separate protective conductor is used in the system

• TN-C-S system: the neutral and protective conductors are combined to one single conductor in a
part of the system

• TN-C system: the neutral and protective conductors are combined to one single conductor in the
whole system

Reference to IEC 60364-4-41 413.1.3

All exposed conductive parts of the installation must be connected to the earthed point of the power
system by protective conductors which must be earthed at or near to each relevant transformer or
generator.

Exposed conductive parts that are accessible at the same time must be connected to the same earthing
system, either individually, in groups or collectively.

Normally the earthed point of the power system is the neutral point. If a neutral point is not available or
accessible, a phase conductor must be earthed. The phase conductor must not serve as a PEN conductor.

In fixed installations a single conductor may serve both as a protective conductor and a neutral conductor
(PEN conductor).

Reference to IEC 60364-5-54 546.2.3

If from any point in the installation the neutral and protective functions are provided by separate
conductors, it is inadmissible to connect these conductors to each other from that point. At the point of
separation, separate terminals or bars must be provided for the protective and neutral conductors. The
PEN conductor must be connected to the terminal or bar intended for the protective conductor.

23Symmetra MW II 1200 kW 3 × 400/230 V Installation - 990-1979E-001

If there are other effective earth connections, the protective conductors must be connected to such points
when it is possible. It may be necessary to earth at additional points to ensure that the potentials of
protective conductors remain as close as possible to that of earth in case of a fault.

Additional requirements for generating sets (IEC 60364-5-55 551.4.2)

To be used when the generating set provides a switched alternative to the public supply.

Protection by automatic disconnection of supply must not rely on the connection to the earthed points of
the public supply system when the generator is operating as a switched alternative to a TN system. A
suitable earth electrode must be provided.

Protective devices in TN systems

The following protective devices are recognized in TN systems:

• Overcurrent protective devices

• Residual current protective devices (not to be used in TN-C systems)

When a residual current protective device is used in a TN-C-S system, a PEN conductor must not be
used on the load side. The connection of the protective conductor to the PEN conductor must be made on
the source side of the residual current protective device (see below illustration):

L1 L1

SOURCE LOAD

L1 L1

L1 L1

PEN N

Residual Current Sense

PE

The characteristics of protective devices and the circuit impedances shall be such that, if a fault of
negligible impedance occurs anywhere in the installation between a phase conductor and a protective
conductor or exposed conductive part, automatic disconnection of the supply will occur within 5 seconds
(valid for distribution circuits), the following condition fulfilling this requirement:

ZsIa× U0≤

In the condition:

Z

s

I

a

is the impedance of the fault loop comprising the source, the live conductor up to the point of the
fault, and the protective conductor between the point of the fault and the source

is the current causing the automatic operation of the disconnecting protective device within a
conventional time not exceeding five seconds

U

0

is the nominal AC RMS voltage to earth

Symmetra MW II 1200 kW 3 × 400/230 V Installation - 990-1979E-00124

If a fault occurs close to the UPS (before the power distribution) while the UPS system is in Battery
Operation and Bypass is unavailable, the available power is unable to activate the protective device. In
that situation the Inverter will shut down in five seconds (IEC 60364-4-41 413.1.3.5 norm). If a residual
current protective device is used, this device will disconnect the supply.

The four diagrams show the Symmetra MW installed in four different TN systems:

• Earthing arrangements and protective conductors - Symmetra

• Earthing arrangements and protective conductors - Symmetra

®

MW in “TN-S installation”

®

MW in “TN-S installation” (Legal

in DK - special cases)

®

• Earthing arrangements and protective conductors - Symmetra

• Earthing arrangements and protective conductors - Symmetra

MW in “TN-C-S installation”

®

MW in “TN-C installation”

TT Systems

Characteristics

TT systems have one point connected directly to ground and all exposed conductive parts of the
installation must be connected to an earth electrode. This earth electrode is independent of the power
system earthed point.

Reference to IEC 60364-4-41 413.1.4

All exposed conductive parts that are protected collectively by the same protective device must be
connected to a common earth electrode together with the protective conductors. In installations where
several protective devices are utilized in series, the requirement applies separately to all exposed
conductive parts protected by each device.

The neutral point or, if a neutral point does not exist, a phase conductor of each generator station or
transformer station must be earthed.

Protective devices in TT systems

The following protective devices are recognized in TT systems:

• Overcurrent protective devices

• Residual current protective devices

Overcurrent protective devices are only applicable for protection against indirect contact in TT systems
where a low RA value exists (see specification below).

The condition must be fulfilled.

RAIa× 50V≤

In the condition:

R

A

I

a

is the sum of resistance of the earth electrode and the protective conductor for the exposed
conductive parts

is the current causing the automatic operation of the protective device.
When the protective device is a residual current protective device, Ia is the rated residual operating
current I

n

Δ

25Symmetra MW II 1200 kW 3 × 400/230 V Installation - 990-1979E-001

For discrimination purposes, S-type residual current protective devices may be used in series with
general type residual current protective devices. To provide discrimination with S-type residual current
protective devices, an operating time not exceeding 1 second is permitted in distribution circuits.

When the protective device is an overcurrent protective device, it must be either:

• a device with inverse time characteristics and

I

must be the current causing automatic operation

a

within 5 seconds, or

I

• a device with an instantaneous tripping characteristic and

must be the minimum current causing

a

instantaneous tripping

The following diagram shows a Symmetra

• Earthing arrangements and protective conductors - Symmetra

®

MW installed in a TT system:

®

MW in “TT installation”

IT Systems

Characteristics

In IT systems the installation is insulated from earth or connected to earth through a sufficiently high
impedance. Exposed conductive parts are earthed individually, in groups, or collectively.

Reference to IEC 60364-4-41 413.1.5

In IT systems the installation must be insulated from earth or connected to earth through a sufficiently
high impedance. This connection must be made either at the neutral point of the system or at an artificial
neutral point. The latter may be connected directly to earth if the resulting zero-sequence impedance is
sufficiently high. In installations where no neutral point exists, a phase conductor can be connected to
earth through an impedance. In case of a single fault to an exposed conductive part or to earth, the fault
current will be low and disconnection will not be imperative.

Exposed conductive parts must be earthed individually, in groups or collectively and the condition

RAId× 50V≤

must be fulfilled.

In the condition:

R

A

I

d

is the resistance of the earth electrode for exposed conductive parts

is the fault current of the first fault of negligible impedance between a phase conductor and an
exposed conductive part. The Id value takes the leakage currents and the total earthing impedance
of the electrical installation into account

In systems where an IT system is used for continuity of supply, an insulation monitoring device must be
provided to indicate the occurrence of a first fault from a live part to the exposed conductive parts or to
the earth. It is recommended to eliminate a first fault as soon as possible.

Symmetra MW II 1200 kW 3 × 400/230 V Installation - 990-1979E-00126

Depending on whether all exposed conductive parts are interconnected by a protective conductor
(collectively earthed) or are earthed in groups or individually, after a first fault, the disconnection
conditions of the supply for a second fault must be as follows:

1. In installations where the exposed conductive parts are earthed in groups or individually, the

protection conditions for TT systems apply (see 413.1.4.1)

2. In installations where the exposed conductive parts interconnected by a protective conductor

collectively earthed, the conditions for TN systems apply

In installations where the neutral is not distributed, the following conditions must be fulfilled:

3 U0×

Z

--------------------≡

s

2 I

×

a

In installations where the neutral is distributed, the following conditions must be fulfilled:

U

Z′

0

-------------≤

s

2 Ia×

In the condition:

U

0

Z

s

is the nominal AC RMS voltage between phase and neutral

is the impedance of the fault loop comprising the phase conductor and the protective conductor of
the circuit

Z′

s

is the impedance of the fault loop comprising the neutral conductor and the protective conductor of
the circuit

I

a

is the operating current of the protective device. The disconnecting time is 5 seconds (distribution
circuits)

Protective devices in IT systems

The following protective devices are recognized in IT systems:

• Insulation monitoring devices

• Overcurrent protective devices

• Residual current protective devices

®

The following diagram shows a Symmetra

MW installed in a IT system:

• Earthing arrangements and protective conductors - Symmetra

®

MW in “IT installation”

27Symmetra MW II 1200 kW 3 × 400/230 V Installation - 990-1979E-001

( PDU )

PE

Residual current protective device

can be used.

Residual Current Sense

Q4

Q6

L1L3L2

PE

Q3

Extern al SSW-By pass

Main Protective Earthing Terminal

See: IEC 60364-4-41 § 413.1.3

Bypass - input Bypass - output

Earthing arrangements and protective conductors - Symmetra MW in TN-S installa tion

Switc hgear

Q5

L1L3L2

PE

L1L3L2

UPS - output

u

M

u

Symme tra MW

Delta

Inverter

iii

Mains - input

L1L3L2

Q1

N

PE

Main

inverter

u

Main Protective Earthing Terminal

Battery 2

Common-mode filter

PE

E

N

Protective Earthing Conductor

Protective Earthing Conductor

+- +-

Battery 1

Q7 Q8

PE

Battery

box

breaker

Suitable earth electrode

with reference to IEC 60364-5-55 § 551.4.2

Battery 1 Battery 2

Battery

PE

rack

Residual Current Sense

With reference to:

IEC 60364-4-41 § 413.1.3.1

Minimum cross-sectional areas:

IEC 364-5-54 § 543.1.1

Residual current protective device can not be

used at this point.

Owing to parallel return path for the fault current

N

Servi ce Entrance

PE

Symmetra MW II 1200 kW 3 × 400/230 V Installation - 990-1979E-00128

( PDU )

PE

Residual current protective

device can be used.

Residual Current Sense

Q4

Q6

L1L3L2

PE

Q3

Extern al SSW-By pass

Main Protective Earthing Terminal

( Legal in DK - special cases )

Bypass - input Bypass - output

L1L3L2

PE

L1L3L2

UPS - output

u

M

u

Symme tra MW

Delta

Inverter

iii

Mains - input

L1L3L2

N

PE

Main

inverter

u

Main Protective Earthing Terminal

Battery 2

Common-mode filter

PE

E

N

Protective Earthing Conductor

+- +-

Battery 1

Q7 Q8

PE

breaker

box

Battery

Battery 1 Battery 2

PE

rack

Battery

See: IEC 60364-4-41 § 413.1.4 and "Stærkstrømsbekendtgørelsen" § 551.6.3, Note

Switch gear

Q5

Earthing arrangements and protective conductors - Symmetra MW in "TN-S instal lation"

Q1

Protective Earthing Conductor

Legal in DK ( Special cases )

With reference to:

Stærkstrømsbekendtgørelsen § 551.6.3 Note

( § 551.6.3 is missing in IEC 60364-5-55 )

Residual Current Sense

With reference to:

IEC 60364-4-41 § 413.1.3.1

Minimum cross-sectional areas:

IEC 364-5- 54 § 543.1.1

Residual current protective device can not be

used at this point.

Owing to parallel return path for the fault current

N

Servi ce Entrance

PE

29Symmetra MW II 1200 kW 3 × 400/230 V Installation - 990-1979E-001

( PDU )

PE

Residual current protective

device can be used.

Residual Current Sense

Q4

Q6

Earthing arrangements and protective conductors - Symmetra MW in "TN-C-S in stallatio n"

See: IEC 60364-4-41 § 413.1.3

L1L3L2

PE

Q3

Extern al SSW-By pass

Main Protective Earthing Terminal

Bypass - input Bypass - output

Switch gear

Q5

L1L3L2

PE

L1L3L2

UPS - output

u

M

u

Symme tra MW

Delta

Inverter

iii

Mains - input

L1L3L2

Q1

Residual Current Sense

N

PE

Main

inverter

u

Main Protective Earthing Terminal

Battery 2

Common-mode filter

PE

E

N

Protective Earthing Conductor

PE

+- +-

Battery 1

breaker

Battery

Suitable earth electrode

with reference to IEC 60364-5-55 § 551.4.2

Q7 Q8

PE

box

Battery 1 Battery 2

PE

rack

Battery

Residual current protective

device can not be used.

Servi ce Entrance

PEN

With reference to:

IEC 60364-4-41 § 413.1.3.1

PEN

Symmetra MW II 1200 kW 3 × 400/230 V Installation - 990-1979E-00130

( PDU )

PE

N

PEN

Q4

Q6

Earthing arrangements and protective conductors - Symmetra MW in TN-C installa tion

See: IEC 60364-4-41 § 413.1.3

This system configuration is not recommended

L1L3L2

PE

Q3

Extern al SSW-By pass

Main Protective Earthing Terminal

Bypass - input Bypass - output

Switch gear

Q5

L1L3L2

PE

L1L3L2

UPS - output

u

M

u

Symme tra MW

Delta

Inverter

iii

Mains - input

L1L3L2

N

PE

Main

inverter

u

Main Protective Earthing Terminal

Common-mode filter

E

N

PEN PEN

The "Common-Mode Filter" has no effect in this

system configuration.

Battery 2

Battery 1

+- +-

Q7 Q8

PE

PE

breaker

Battery

box

Battery 1 Battery 2

PE

rack

Battery

Q1

Suitable earth electrode

with reference to IEC 60364-5-55 § 551.4.2

PEN

With reference to:

IEC 60364-4-41 § 413.1.3.1

Servi ce Entrance

PEN

31Symmetra MW II 1200 kW 3 × 400/230 V Installation - 990-1979E-001

( PDU )

PE

Residual current protective device

can be used.

Residual Current Sense

Q4

Q6

Earthing arrangements and protective conductors - Symmetra MW in TT installa tion

See: IEC 60364-4-41 § 413.1.4

L1L3L2

PE

Q3

Exter nal SSW-By pas s

Main Protective Earthing Terminal

L1L3L2

UPS - output

u

M

Delta

Inverter

iii

u

Symme tra MW

N

PE

Main

inverter

u

Main Protective Earthing Terminal

Battery 2

Common-mode filter

+- +-

Battery 1

Battery 1 Battery 2

Q7 Q8

Bypass - input Bypass - output

Switc hgear

Q5

L1L3L2

PE

Mains - input

L1L3L2

PE

E

N

Protective Earthing Conductor

PE

PE

box

Battery

breaker

< 50V

a

x I

A

Battery

PE

rack

Q1

With reference to IEC 60364-4-41 § 413.1.4.2

Suitable earth electrode: R

Residual Current Sense

With reference to IEC 60364-4-41 § 413.1.4.1

Residual current protective device can not be

used at this point.

Owing to parallel return path for the fault current

Servi ce Entrance

N

Symmetra MW II 1200 kW 3 × 400/230 V Installation - 990-1979E-00132

( PDU )

PE

Residual current protective device

can be used.

Residual Current Sense

Q4

Q6

Earthing arrangements and protective conductors - Symmetra MW in "IT - installat io n"

See: IEC 60364-4-41 § 413.1.5

L1L3L2

PE

Q3

Extern al SSW-By pass

Main Protective Earthing Terminal

Bypass - input Bypass - output

L1L3L2

PE

L1L3L2

UPS - output

u

M

u

Symme tra MW

Delta

Inverter

iii

Mains - input

L1L3L2

N

PE

Main

inverter

u

Main Protective Earthing Terminal

Battery 2

Common-mode filter

PE

E

N

+- +-

Battery 1

Q7 Q8

PE

breaker

Battery

box

Battery 1 Battery 2

PE

rack

Battery

Z

Earthing Conductor

Grounding

impedance

< 50V

Switc hgear

Q5

Q1

Protective Earthing Conductor

( Alternative to earth electrode )

d

x I

A

Suitable earth electrode: R

With reference to IEC 60364-4-41 § 413.1.5.3

Alternative:

The exposed-conductive-parts can be earthed individually or in groups.

But special demands are required. See IEC 60364-4-41 § 413.1.5.5 a)

Insulation

Monitoring

Device

Requirement !!

IEC 60664-4-41 § 413.1.5.4

Grounding

impedance

Servi ce Entrance

Z

N

33Symmetra MW II 1200 kW 3 × 400/230 V Installation - 990-1979E-001

APC Worldwide Customer Support

Customer support for this or any other APC product is available at no charge in any of the following ways:

• Visit the APC Web site to access documents in the APC Knowledge Base and to submit customer
support requests.

– www.apc.com (Corporate Headquarters)

Connect to localized APC Web sites for specific countries, each of which provides customer support
information.

– www.apc.com/support/

Global support searching APC Knowledge Base and using e-support.

• Contact the

– Local, country-specific centers: go to www.apc.com/support/contact for contact information.

For information on how to obtain local customer support, contact the APC representative or other distributors
from whom you purchased your APC product.

APC Customer Support Center by telephone or e-mail.

Entire contents copyright 2009 American Power Conversion Corporation. All rights reserved. Reproduction

in whole or in part without permission is prohibited. APC, the APC logo, and Symmetra are trademarks of

American Power Conversion Corporation. All other trademarks, product names, and corporate names are the

property of their respective owners and are used for informational purposes only.

4/2009990-1979E-001

*990-1979E-001*