Activating And Deactivating Buffer Operation - Siemens SITOP PSU8600 Manual

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3.11 Activating and deactivating buffer operation

3.11 Activating and deactivating buffer operation
Using control contact ON (terminals "X1" and "X2") at BUF8600 buffer modules with double-
layer capacitors, buffer operation can be activated, deactivated or exited when the power
fails. Preventing or exiting buffer operation is especially interesting for non-operational
periods, to prevent buffer components from being unnecessarily discharged. This then
facilitates the fastest possible buffer readiness after switching on again.
Buffer operation is only possible if terminals "X1" and "X2" are connected at the buffer
module. When delivered, this is implemented using a wire jumper. As a consequence, buffer
operation can be enabled, prevented or exited using a floating contact (e.g. a contact in the
plant or system). Instead of the wire jumper, the contact is closed, and this must have
< 10 Ohm in the closed state. The buffer components are charged irrespective of whether
contacts "X1" and "X2" are connected - or not.
Activating buffer operation
1. Close the connection between terminals "X1" and "X2".
When the power fails, the power supply system is automatically buffered using the buffer
components.
Deactivating buffer operation
1. Open the connection between terminals "X1" and "X2".
When the power fails, the power supply system is not buffered using the buffer
components.
Buffer operation is immediately exited if the connection between terminals "X1" and "X2"
is opened during buffer operation.
Note
Response for two buffer components in the system
If the system has two buffer modules, opening the connection between terminals "X1" and
"X2" of one buffer module means that also the second buffer module is deactivated. This
also applies to buffer modules with electrolytic capacitors, without control contact!
Note
The external circuit must meet the requirements relating to SELV circuits according to
EN 60950-1.
80
PSU8600power supply systems
Manual, 04.2016, A5E35883207-7-76