NOVAR 2600 Operating Manual
•
disconnect the wires connected to the instruments L2 input, swap them and connect to the L3
input
•
disconnect the wires connected to the L3 input and connect them to the L3 input (while
keeping their polarity)
Then launch the CT test again to be sure the intervention was successful.
If polarity of all of current inputs correct and there is necessary to move two or three inputs to
another phase it is usually simpler to move appropriate voltage inputs instead, because you
need not to short-circuit the CT outputs, there is only one wire at each voltage input and they
can be usually simply temporary disconnected with front-end protection fuses or breakers.
If the instrument does not succeed in the detection of connection of any of phases even after the sixth
round pass, the test is finished with unsuccessful measurement result (
- - -
). It could occur due to
various causes :
•
considerable power fluctuations in load during the test; start the test again when the load is
more stable
•
reactive powers of compensation elements connected to the first control outputs are too low
in compare with actual network load; start the test again after the load drops down or set the
outputs temporarily to the fixed-off state to force the controller to use other outputs with
higher power
•
compensation elements connected to the first control outputs are not single-phase or three-
phase capacitors; try the same modification as in the previous point
•
if, for example, single phase capacitors of C1 and C2 type only are connected to the outputs,
the connection cannot be detected in the L3 phase; try the same modification as in the
previous point
Ongoing CT test can be interrupted at any point either manually by pushing the
button or by
any of alarm actuations.
4.4.5 Single-Phase Mode
You can use this mode for three-phase network compensation when one current signal only (from a
CT installed at one of phases) is available. A precondition for the correct function is approximately
symmetrical load in all three phases.
The controller operates in the single-phase mode when the
type of connection
(in t
he Installation
group of parameters) is set to
1Y3
or
1D3
.
4.4.5.1 Connection
Connect the current signal to
I11
and
I12
(No. 1, 2) terminals of the
CURRENT
connector. Other
current inputs stay free, signal of their inputs is not measured.
Voltage signals must be connected to all of three voltage inputs. For networks with neutral wire,
connection of all three phase voltages and neutral wire is recommended (
1Y3
connection type). If it is
not possible connect any of phase voltages to the U1, U2 and U3 inputs together.
49
Summary of Contents for NOVAR 2600
Page 82: ...NOVAR 2600 Operating Manual NOVAR 2600 T18 Typical Installation 82...
Page 83: ...NOVAR 2600 Operating Manual NOVAR 2600 T7 Typical Installation 83...
Page 87: ...NOVAR 2600 Operating Manual NOVAR 2600 T External Temperature Sensor Connection 87...
Page 88: ...NOVAR 2600 Operating Manual NOVAR 2600 4 RS485 Remote Communication Connection 88...
Page 89: ...NOVAR 2600 Operating Manual 8 Manufactured Models and Marking 89...
