ABB REF 54 Series Technical Reference Manual page 28

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Technical Reference Manual, General
When the values for the measuring devices (refer to sections "Scaling
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the rated values of the protected unit for analogue channels" and
"Technical data of the measuring devices" on page 33) are changed via
the HMI or the Relay Setting Tool, the new values take effect only after
they have been stored via the parameter "Store" and the feeder terminal
has been reset via the parameter "Software reset" in the menu
Configuration/General or by using the relay command buttons
"Store" and "Reset" in the Relay Download Tool.
The same applies for some communication parameters, i.e. the SPA
baud rate, most MODBUS parameters, the RTD data frame parameter of
the IEC_103 protocol, the protocol selection parameters (Protocol 2 and
Protocol 3 in the menu Communication/General) and the
command timeout parameter in the menu Communication/
General.
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For its operation the REF 54_ terminal, including the external display module,
requires a secured auxiliary voltage supply. The feeder terminal's internal power
supply module forms the voltages required by the feeder terminal electronics. The
power supply module is a galvanically isolated (flyback-type) DC/DC converter. A
green protection LED indicator on the front panel is lit when the power supply
module is in operation.
The main unit and the external display module must each be provided
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with separate power supply from a common source.
The feeder terminal is provided with a 48-hour capacitor back-up protection
enables the internal clock to keep time in case of an auxiliary power failure.
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There are two basic types of power supply modules available for the REF 54_ feeder
terminals: type PS1/_ and type PS2/_. The module PS1/_ is used in REF 541 and
REF 543 terminals. The module PS2/_ is intended for the REF 545 terminal. Both
modules are available in two versions: PS1/48 V, PS1/240 V, PS2/48 V, PS2/240 V.
There are also differencies in the threshold voltages of the power supply modules'
digital inputs. PS1/_ has three different alternatives for threshold voltage of the
binary inputs: low, medium and high version. The threshold voltage of the low
version is 18 V dc, medium version 80 V dc and high version 140 V dc. The module
PS1/48 V is a low version power supply and PS1/240 V is a medium or high version.
The type PS2/_ does not have binary inputs.
1. This function is only supported in the feeder terminal revisions of the Release 2.0 or
later, refer to section "Revision identification" on page 90.
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