Voltage
Default Value
200V
390
400V
780
575V
930
690V
1120
Braking IGBT Lower Threshold
(06.073) defines the lowest level of
D.c. Bus Voltage
(05.005) where the braking IGBT will become active and
Braking IGBT Upper Threshold
(06.074) defines the level of
D.c. Bus Voltage
(05.005) where the braking IGBT will be on continuously. When the braking
IGBT is turned on it will remain on for at least 1ms. The braking IGBT on-time is defined by the thresholds and the d.c. link voltage as given in the table
below where L =
Braking IGBT Lower Threshold
(06.073) and U =
Braking IGBT Upper Threshold
(06.074).
D.c. link voltage level
On-time
D.c. Bus Voltage
(05.005)
0%
L ≤
D.c. Bus Voltage
(05.005)
[(
D.c. Bus Voltage
(05.005) - L) / (U - L)] x 100%
D.c. Bus Voltage
(05.005) ≥ U
100%
As the
D.c. Bus Voltage
(05.005) rises above the lower threshold the braking IGBT is active with an on/off ratio of 1/100. As the voltage rises further, the
on/off ratio increases until at the upper threshold the braking IGBT is on continuously. The upper and lower voltage threshold can be set up so that
braking resistors in drives with parallel connected d.c. links will share the braking load.
If
Braking IGBT Lower Threshold
(06.073) ≥
Braking IGBT Upper Threshold
(06.074) then the braking IGBT is off when
D.c. Bus Voltage
(05.005) <
Braking IGBT Upper Threshold
(06.074) and on if
D.c. Bus Voltage
(05.005) ≥
Braking IGBT Upper Threshold
(06.074). This method of control is the
same as that used in Unidrive SP and the default values for the braking thresholds are equal to the braking thresholds in Unidrive SP.
Unless sharing between braking resistors is required the braking thresholds do not normally need to be adjusted. Care should be taken when reducing the
thresholds because if either threshold is below the maximum value of the peak rectified supply voltage the braking resistor could take power from the
supply.
The list below gives conditions that will disable the braking IGBT:
1.
Braking IGBT Upper Threshold
(06.074) = 0, or
Low Voltage Braking IGBT Threshold Select
(06.076) = 1 and
Low Voltage Braking IGBT Threshold
(06.075) = 0.
2. The drive is in the under-voltage state.
3. A priority 1, 2 or 3 trip is active (see
Trip 0
(10.020)).
4. One of the following trips is active or would be active if another trip is not already active:
OI Brake
,
PSU
,
Th Brake Res
or
OHt Inverter
.
5.
Percentage Of Drive Thermal Trip Level
(07.036) = 100%. This is an indication that some part of the drive is too hot and is used to
indicate if an internally fitted braking resistor is too hot.
6.
Brake R Too Hot
is active or the system has been set up to disable the braking IGBT based on the braking resistor temperature and the
resistor is too hot (i.e. bit 2 of
Action On Trip Detection
(10.037) is set).
Parameter
06.074
Braking IGBT Upper Threshold
Short description
Defines the level of the d.c. bus voltage where the braking IGBT will be on continuously
Mode
Open
‑
Loop
Minimum
−VM_DC_VOLTAGE_SET
Maximum
VM_DC_VOLTAGE_SET
Default
See exceptions below
Units
V
Type
16 Bit User Save
Update Rate
4ms read
Display Format
Standard
Decimal Places
0
Coding
RW, VM, RA
Voltage
Default Value
200V
390
400V
780
575V
930
690V
1120
See
Braking IGBT Lower Threshold
(06.073).
Parameter
06.075
Low Voltage Braking IGBT Threshold
Short description
Defines the threshold used for low voltage braking
Mode
Open
‑
Loop
Minimum
−VM_DC_VOLTAGE_SET
Maximum
VM_DC_VOLTAGE_SET
Default
0
Units
V
Type
16 Bit User Save
Update Rate
4ms read
Display Format
Standard
Decimal Places
0
Coding
RW, VM, RA
If
Low Voltage Braking IGBT Threshold Select
(06.076) = 0 the normal thresholds are used. If
Low Voltage Braking IGBT Threshold Select
(06.076) = 1
then
Low Voltage Braking IGBT Threshold
(06.075) is used, so that the braking IGBT is on with a minimum on time of 1ms is the d.c. link voltage is above
this level, or off if the d.c. link voltage is below this level.
106
Powerdrive F300 Parameter Reference Guide
Issue: 01.15.00
Summary of Contents for Powerdrive F300
Page 1: ...Parameter Reference Guide Powerdrive F300 Open Loop Mode Issue 01 15 00 ...
Page 21: ...Powerdrive F300 Parameter Reference Guide Issue 01 15 00 21 ...
Page 112: ...112 Powerdrive F300 Parameter Reference Guide Issue 01 15 00 ...
Page 144: ...144 Powerdrive F300 Parameter Reference Guide Issue 01 15 00 ...
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Page 232: ...232 Powerdrive F300 Parameter Reference Guide Issue 01 15 00 ...