Low Auxiliary Voltage Indication; Overtemperature Indication - ABB REF 54 Series Technical Reference Manual, General

1MRS750527-MUM
5.1.5.2.
5.1.5.3.
Feeder Terminal
Technical Reference Manual, General
The external display module is only available together with a main unit equipped
with the PS_/240 power supply module.
The power supply version is specified by the first letter in the order number of REF
54_ (refer to Section "Ordering Information" on page 103). 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 feeder terminals will be delivered with
digital inputs that also have the higher rated input voltage.
For further technical data of the power supply, refer to Table 5.2.1-2 on page 89.

Low auxiliary voltage indication

The REF 54_ feeder terminal is provided with a low auxiliary voltage indication
feature. The power supply module issues an internal alarm signal when a drop in the
power supply voltage is detected (ACFail, active low). The alarm signal is activated
if the power supply voltage falls about 10% below the lowest rated DC input voltage
of the power supply module, see the following table.
Table 5.1.5.2-1 Low auxiliary voltage indication for power supplies
Rated input voltage
PS_/240
• Rated input voltage 110/125/ 220 V DC
• Rated input voltage 110/120/220/ 240 V AC
PS_/48
• Rated input voltage 24/48/60 V DC
The indication of a low auxiliary voltage (ACFail) is available in the feeder terminal
configuration environment and can be connected to any signal output of the REF
54_. The auxiliary voltage indication in the feeder terminal configuration is as
follows:
REF 541: PS1_4_ACFail
REF 543: PS1_4_ACFail
REF 545: PS2_4_ACFail

Overtemperature indication

The REF 54_ feeder terminal includes an internal temperature supervision function.
The power supply module issues an internal alarm signal when overtemperature has
been detected inside the terminal enclosure. The alarm signal will be activated once
the temperature inside the terminal enclosure increases to +78
Overtemperature indication is available in the feeder terminal configuration and can
be connected to any signal output of the terminal. The overtemperature indication
input in the feeder terminal configuration is as follows:
REF 541: PS1_4_TempAlarm
REF 543: PS1_4_TempAlarm
REF 545: PS2_4_TempAlarm
REF 54_
Low indication level
99 V DC
88 V AC
21.6 V DC
o o
C (+75...+83 C).
35