Is the Voter Unit SS822 rated input / output 35VDC ? how to use it for SD834 connection ?
SS822 has 2 inputs, 1 output as voltage voter.
In manual 3BSE036351-510, page 368, table 115, SS822-Technical data and mounting dimension: it shows the rated input and output voltage as 35VDC, is it correct ? we usually use 24VDC for our IO modules.
In page 369, Figure 100 SS822 - used in Redundant SD821 Configuration. It is okay for SD831 / SD832 / SD833.
But we want to use SD834 (20A) with redundant function, could we use the same connection drawing --- 1 SS822 + 2 SD834 ?
we have to use 2 SS822 + 2 SD834, how to connect them in this way ?
thanks / Juan Yu
Voted best answer
For Question1: Since SS822 is just Diode-o-ring it has capablity
Here two terms
Nominal Voltage(24V):The 'nominal voltage' is the voltage for which the Diode-O-Ring is intended to be used.
Rated Input Voltage(35V):The 'rated voltage' is the maximum voltage that the Diode-O-ring can interrupt safely and without being damaged by excessive arcing.
Here always Nominal voltage is lower than rated input voltage so that SS822 will work with safe & satisfactorily.
So always Margin=rated input-Nominal Input must be large enough so that variations in the nominal voltage of power inputs.
For Question2:Since SS822 has moved from active to classic life cycle phase in june2010 so you have to go with new diode-o-ring SS832(10A) to use with SD831(3A)/SD832(5A)/SD833(10A)/SD834(20A)
refer the below for new series of power supplies & Diode -oring
Since SS832 can able to supply load up to 10A so inorder to achieve 20A then you have make parallel connection.
Refer the below link for more info. http://abblibrary.abb.com/global/scot/scot313.nsf/veritydisplay/cff3493b0f87af1
for my question 2:
the connection drawing of SS822 in manual is suitable for the PSU of 3A, 5A, 10A types. There is a table which listed 2 sets of SS822 are suggested for redundant SD834. but no connection drawing for that is found.
from the "SS822-Technical data and mounting dimension", it has 2 inputs, and related input power is 500W, why need 2 sets of SS822, could we use 1 sets SS822 for 2 sets of SD834?
Does any one have similar usage like ours ?