14 Chapter 3 Commissioning
NetSure 531 A41, NetSure 531 A91 Subrack Power system User Manual
Chapter 3 Commissioning
The more details of the controller please refer to the ACU+ User Manual, the NCU User Manual and the LCU+ User
Manual. This chapter introduces procedures of installation testing. The corresponding safety rules shall be adhered to
in the test.
3.1 Installation Check And Startup
Before the test, inform the chief manufacturer representative. Only trained electrical engineer can maintain and
operate this equipment. In operation, the installation personnel are not allowed to wear conductive objects such as
watches, bracelets, bangles and rings.
During operation, parts of this equipment carry hazardous voltage. Misoperation may result in severe or fatal injuries
and property damage. Before the test, check the equipment to ensure the proper earthing. Installation check must be
done before testing. Then the batteries can be charged for the first time.
Make sure that the AC input MCBs, battery MCBs and load MCBs are switched off. Make sure that all the devices are
properly installed.
Installation check
Check all the MCBs and cables. Are their models correct?
Check the bus bar connections, input and output cable connection, and connection between the power
system and the system grounding.
Check the if the number and connections of the batteris are correct. Check the polarity of the battery string
with a voltmeter.
Make sure all the cable connections are firm and reliable.
Make sure that all the MCB are switched off.
Measure the AC input voltage. Make sure the input voltage is within the allowable range.
Check that the communication and alarm cables are connected to the signal transfer board.
Check that the temperature sensor, if any, has been installed.
Check that the battery string circuit is not closed.
Connect the disconnected batteries to the battery string circuit
Switch off unconnected battery MCBs. Check that the battery signal cables are connected to battery
MCBs reliably, not loosened or suspended
Measure with a voltmeter across the connection points of each battery and make sure that the polarity is
right. For a lead-acid battery with 24 cells, the voltmeter should read 2.0-2.1V/cell or 48-51V/battery. If the
voltage of certain cell is lower than 2.0V, that cell must be replaced.
Check with an ohmmeter that there is no short circuit between the positive & negative distribution bus
bars, or between the positive & negative battery poles
(Note: Pull out all modules before the check and restore them after the check)
Switch on the system AC input MCB. The green LED on the rectifier will be on and the fan will start
running after a certain delay. The controller will show that the power supply voltage is 53.5V.
Check the system voltage and busbar polarity with a voltmeter. The voltage difference between the
measured value and displayed value should be less than ± 0.2V.
Start and stop each rectifier of the system by unplugging and inserting each rectifier. Check their output
voltages.
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