ABB SYN 5201 Operating Instructions Manual page 26

Operating Instructions
3.2 Front panel
On the front panel of the SYN 5201 or SYN 5202 there is a block of status displays, as
well as eight keys and the liquid crystal display (LCD) of the built-in service controls.
Status displays (LED)
The status display consists of 3 rows of LEDs which are sub-divided as follows:
Group
Left-hand row:
commands
Centre row:
fulfilled paralleling
conditions
Right-hand row:
operating status
abb
ABB Switzerland Ltd
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Designation Function
Indicate outgoing commands, i.e., the output of the
U+, U-, f+, f-
Higher and Lower commands for voltage and
COMMAND
frequency and the paralleling command
(colour: yellow)
U  Umax Indicate if U, and s are within the tolerance band
s  smax
or at least one measuring voltage is lacking.
max
U1/U2 = 0
Indicates paralleling release (only in synchrocheck
CHK RELEASE
mode)
(colour: yellow)
Indicates readiness for operation
READY
(colour: green)
Synchronizing process is in operation
OPERATING
(colour: yellow)
Indicates the blocked status of the device, e.g. as
BLOCKED
when carrying out commissioning work.
(colour: yellow)
Indicates that a fault message is active (the
ERROR
BLOCKED LED always lights up at the same time)
(colour: red)
Document No Art Part
3BHS109762 E01
SYN 5201/SYN 5202
Language Revision page
en D 26