Chapter 6
Troubleshooting
6–13
Using Undervoltage Setpoint
You can use Undervoltage Setpoint (parameter 224) to set the level of
bus voltage that must be present to complete precharge and a level where
ridethrough can be initiated. If configured as a fault/warning,
Undervoltage Setpoint sets the bus voltage level that faults/warns the
drive. The bus voltage level that is used is determined as follows:
Undervoltage Setpoint * Rated Inverter Input Voltage (parameter 221) *
sqrt(2) = bus voltage level for ridethroughs, faults, or warnings
Using Testpoint Select 1 and Testpoint Data 1 to View Software
Testpoints
Additional information concerning precharges and ridethroughs is
available through Testpoint Select #1 (parameter 273) and Testpoint Data
#1 (parameter 274).
Viewing the Calculated Undervoltage Value of Bus Voltage
To view the value of the calculated undervoltage:
1. Enter a value of 24 into Testpoint Select #1.
2. Monitor Testpoint Data #1.
You can use this to check the actual bus voltage that causes an
undervoltage condition.
Checking the Status of the Precharge
To view the precharge status, enter a value of 12 into Testpoint Select #1,
and then monitor Test Data #1 for the precharge status. The precharge
status is bit encoded as follows:
This
bit:
When set, indicates that:
0
The precharge function has been completed and the precharge
device should be on. The drive can be enabled only after this
bit is set.
1
The drive is in ridethrough. Precharge must be completed and
the bus must return to within 75 volts of the bus voltage tracker
before normal drive operation can resume.
2 A precharge–initiated condition is in ridethrough.
3
A precharge has been requested due to an external fault (input).
Common Bus Configuration only
4
The converter is ready for precharge and the controller may
start its precharge function. The external precharge board is ok,
if present.
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