Rockwell Automation 1336T FORCE Series B - Manual (Page 185)

Chapter 5
Programming Parameters
5–59
Precharge/Ridethru Selection
[Prech/Rdethru Sel] Parameter Number 223
File:group Application:Bus Reg/Control
Parameter Type linkable destination
Display Units Bits
Drive Units None
Factory Default 0000 0000 0000 0000
Minimum Value 0000 0000 0000 0000
Maximum Value 1111 1111 1111 1111
Conversion: 1 = 1
Parameter 223 lets you choose options for
the bus filter reference, precharge/ride-
through conditions, and braking.
Use bits 0 through 4 to set the slew rate for
the bus voltage tracker. The bus voltage
tracker slowly tracks changes in the actual
bus voltage. If none of the bits (0 through
4) are set, the slew rate is 0.05V/second.
The precharge function of the drive limits
the current to the bus capacitors when
power is initially applied to the drive. The
precharge function is completed after a
minimum 300 millisecond time delay and
bus voltage at least 30 volts greater than
the undervoltage setpoint and a stable bus
voltage. Ridethrough provides extended
logic operating time if the power lines drop
out while the drive is running. If the pre-
charge function is enabled, ridethrough
also provides inrush current protection by
starting a precharge, in case the incoming
power returns.
The bits are defined as follows:
Bit Description
0 Slew Rate 1
Set to choose a slew rate of 10V/second Bit
1 Slew Rate 2
Set to choose a slew rate of 5V/second
2 Slew Rate 3
Set to choose a slew rate of 0.5V/second
3 Slew Rate 4
Set to choose a slew rate of 0.05V/second
4 Slew Rate 5
Set to choose a slew rate of 0.005V/second
5 Reserved
Leave 0
Undervoltage Setpoint
[Under Volt Stpnt] Parameter Number 224
Parameter Type Sink
Display Units x.x%
Drive Units None
Factory Default 61.5%
Minimum Value 10.0%
Maximum Value 90.0%
Bus Precharge Timeout
[Prechrg Timeout] Parameter Number 225
Parameter Type Sink
Display Units x.x Sec
Drive Units Display units x 10
Factory Default 30.0 Sec
Minimum Value 10.0 Sec
Maximum Value 6553.5 Sec
This sets the minimum threshold voltage
as a percent of line voltage that will be
compared with the DC Bus Voltage as a
check for a Bus Undervoltage condition.
This parameter establishes a time delay
period for DC Bus Precharge. If the Drive
fails to finish a DC Bus Precharge in this
time, a Precharge Timeout will occur.
Bus Ridethru Timeout
[Ridethru Timeout] Parameter Number 226
Parameter Type Sink
Display Units x.xxx Sec.
Drive Units Display units x 1000
Factory Default 2.000 Sec.
Minimum Value 0.000 Sec.
Maximum Value 65.535 Sec.
This parameter establishes a time delay
period for DC Bus Ridethrough. If the bus
remains in a low bus ridethru condition
longer than this time, a Bus ridethru
timeout condition will occur.
For additional information about Precharge/Ridethrough Selection,
refer to Chapter 12, Troubleshooting
Bit Description
6 Reserved
Leave 0
7 Reserved
Leave 0
8 Fast Fluxup
Set to enable fast flux up
9 Reserved
Leave 0
10 Reserved
Leave 0
11 Prech Exit
Set to force an exit from precharge after the precharge timeout.
12 En Comm Bus
Set to enable common bus precharge. External fault input is
used as precharge enable.
13 Dis Prech Tm
Set to disable bus precharge and undervoltage faults while the
drive is disabled.
14 Dis Mult Pre
Set to disable all precharges after the first power up.
15 Dis Ridethru
Set to disable all ridethroughs.