Installation guide

A-22
Functions
and characteristics
The UA controller is used to create a source-
changeover system integrating the following automatic
functions:
b transfer from one source to another depending on
the presence of voltage UN on the “Normal” source
b startup of an engine generator set
b shedding and reconnection of non-priority circuits
b transfer to the “Replacement” source if one of the
phases on the “Normal” source fails.
The UA controller can control Compact NS and
Masterpact NT/NW devices.
Operating modes
A four-position switch may be used to select:
automatic operation
forced operation on the “Normal” source
forced operation on the “Replacement” source
stop (both “Normal” and “Replacement” sources off, then manual operation).
Setting the time delays
Time delays are set on the front of the controller.
t1. delay between detection that the “Normal” source has failed and the transmission
of the order to open the “Normal” source circuit breaker (adjustable from 0.1
to 30 seconds).
t2. delay between detection that the “Normal” source has returned and the
transmission of the order to open the “Replacement” source circuit breaker
(adjustable from 0.1 to 240 seconds).
t3. delay following opening of QN with load shedding and before closing of QR
(adjustable from 0.5 to 30 seconds).
t4. delay following opening of QR with load reconnection and before closing of QN
(adjustable from 0.5 to 30 seconds).
t5. delay for conrmation that UN is present before shutting down the engine
generator set (adjustable from 60 to 600 seconds).
t6. delay before startup of the engine generator set (120 or 180 seconds).
Commands and indications
Circuit breaker status indications on the front of the controller:
ON, OFF, fault.
A built-in terminal block may be used to connect the following input/output signals:
inputs:
voluntary order to transfer to source R (e.g. for special tariffs, etc.)
additional control contact (not part of the controller). Transfer to the “Replacement”
source takes place only if the contact is closed (e.g. used to test the frequency of UR,
etc.)
outputs:
control of an engine generator set (ON / OFF)
shedding of non-priority circuits
indication of operation in automatic mode via changeover contacts.
Distribution-system settings
Three switches are used to:
select the type of “Normal” source, whether single-phase or three-phase
(e.g. 240 V single-phase or 240 V three-phase)
select whether to remain (or not) on the “Normal” source if the “Replacement”
source is not operational during operation on special tariffs
select the maximum permissible startup time for the engine generator set during
operation on special tariffs (120 or 180 seconds).
Test
A pushbutton on the front of the controller may be used to test transfer from the
“Normal” source to the “Replacement” source, then the return to the “Normal” source.
The test lasts approximately three minutes.
COM communications option
Using the internal bus protocol, this option may be used to remote the following
information:
circuit breaker status (ON, OFF, fault trip)
presence of the “Normal” and “Replacement” voltages
presence of an order for forced operation (e.g. special tariffs)
settings and conguration information
status of non-priority circuits (loads shed or not)
b position of the switch (stop, auto, forced operation on the “Normal” source, forced
operation on the “Replacement” source).
b
b
b
b
b
b
v
v
b
v
v
v
b
b
b
b
b
b
b
b
PB100858DB101778
Front of the UA controller.
Associated controllers
UA controller
Livre 1.indb 22 08/10/2008 18:39:04