1MRS750915-MUM
REM 54_
39
Machine Terminal
Technical Reference Manual, General
5.1.5.
Auxiliary voltage
For its operation, the machine terminal, including the external display module,
requires a secured auxiliary voltage supply. The machine terminal’s internal power
supply module forms the voltages required by the machine terminal electronics. The
power supply module is a galvanically isolated DC/DC converter. A green
protection LED indicator on the front panel is lit when the power supply module is
in operation.
The machine terminal is provided with a 48-hour capacitor back-up protection
1
that
enables the internal clock to keep time in case of an auxiliary power failure.
5.1.5.1.
Power supply versions
The power supply module PS1/_ is available for REM 54_. The module is available
in two versions with identical output voltages but different input voltages.
When REM 54_ is delivered with a fixed display module, the input voltage range of
the power supply module is marked on the front panel of the machine terminal.
When the machine terminal is provided with an external display module, the input
voltage of the display module is marked on the front panel of the module and the
input voltage of the main unit is marked on the side of the unit.
The external display module is only available together with a main unit equipped
with the PS1/240 power supply module.
1
The power supply version is specified by the first letter in the order number of
REM 54_ (refer to section “Ordering Information” on page 95). The voltage range
of the digital inputs is tied to the selected power supply. If a power supply version
with the higher rated input voltage is selected, the machine terminals will be
delivered with digital inputs that also have the higher rated input voltage.
When the values for the measuring devices (refer to section
“Technical data of the measuring devices” on page 45) or
communication parameters (refer to section “Serial communication”
on page 70) 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 machine 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 main unit and the external display module must each be
provided with separate power supply from a common source.
1. This function is only supported in Release 2.0 or later, refer to section “Revision
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