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

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

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APC MW II manual Required Breaker Settings 400 V Systems, Torque specifications, Input and upstream breakers