Diagnostics Optimization CT MODBUS RTU Technical Data
90
E300 Design Guide
Issue Number: 1
Low voltage supply mode enable
Parameter
LV Supply Mode Enable
(
O12
). See
Standard Under Voltage Threshold
(
O11
) and
User Supply Select
(
O10
) for details of when and how
drive parameters can be saved, and when a a PSU 24 V trip can occur.
Low under voltage threshold select
Parameter
Low Under Voltage Threshold Select
(
O13
) See
Standard Under Voltage Threshold
(
O11
), also see
User Supply Select
(
O10
) for details of
when and how drive parameters can be saved, and when a a PSU 24 V trip can occur.
Low under voltage threshold
Parameter
Low Under Voltage Threshold
(
O14
)
Under voltage system contactor output
Parameter
Under Voltage Contactor Close Output
(
O15
) , see
Standard Under Voltage Threshold
(
O11
).
Under voltage system contactor closed
Parameter
Under Voltage System Contactor Closed
(
O16
), see
Standard Under Voltage Threshold
(
O11
).
4.11 Supplies requiring Input line reactors
Input line reactors reduce the risk of damage to the drive resulting from poor phase balance or severe disturbances on the supply network. Where line
reactors are to be used, reactance values of approximately 2 % are recommended. Higher values may be used if necessary, but may result in a loss
of drive output (reduced torque at high speed) because of the voltage drop. For all drive ratings, 2 % line reactors permit drives to be used with a
supply unbalance of up to 3.5 % negative phase sequence (equivalent to 5 % voltage imbalance between phases). Severe disturbances may be
caused by the following factors, for example:
•
Power factor correction equipment connected close to the drive.
•
Large DC drives having no or inadequate line reactors connected to the supply.
•
Across the line (DOL) started motor(s) connected to the supply such that when any of these motors are started, the voltage dip exceeds 20 %.
Such disturbances may cause excessive peak currents to flow in the input power circuit of the drive. This may cause nuisance tripping, or in extreme
cases, failure of the drive. Drives of low power rating may also be susceptible to disturbance when connected to supplies with a high rated capacity.
Line reactors are particularly recommended for use with the following drive models when the above factors exist, or when the supply capacity
exceeds 175 kVA:
Drive models: 03200050, 03200066, 03200080, 03200106, 03400025, 03400031, 03400045, 03400062
Drive models 03400078 to
07600540
have an internal DC reactor and do not require AC line reactors except in extreme supply conditions.
When required, each drive must have its own reactor(s). Three individual reactors or a single three-phase reactor should be used.
Input line reactor current ratings
The current rating of the line reactors should be as follows:
Continuous current rating = Not less than the continuous input current rating of the drive
Repetitive peak current rating = Not less than twice the continuous input current rating of the drive
Input line reactor calculation
To calculate the inductance required (at
Y
%), use the following equation:
Where:
I
= drive rated input current (A)
L
= inductance (H)
f
= supply frequency (Hz)
V
= voltage between lines
For details of the AC input line reactors required for compliance with IEC 61000-3-12 (EN 12015) refer to section 2.11
4.12
Cable selection
The values of maximum continuous input current are given to aid the selection of cables and fuses. These values are stated for the worst case
condition with the unusual combination of stiff supply with high imbalance. The value stated for the maximum continuous input current would only be
seen in one of the input phases. The current in the other two phases would be significantly lower.
The values of maximum input current are stated for a supply with a 2 % negative phase-sequence imbalance and rated at the maximum current given
in section 2.4
on page 12. Refer to local wiring regulations for the correct size of cables. In some cases a larger cable is required to avoid
excessive voltage drop.
Voltage
Default value
200 V
175 V
400 V
330 V
575 V
435 V
690 V
435 V
L
Y
100
----------
V
3
-------
×
1
2
π
f
I
------------
×
=
NOTE
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