99
SPX advanced – description of parameters
SPX ADVANCED APPLICATION MANUAL
SVCH0203—October 2017 www.eaton.com
5.6.5 DC link handling
Code
ID
Parameter
Notes
P1.6.5.1
610
Overvoltage controller “Overvolt contr”
The parameter selects the behaviour of the overvoltage controller in open loop control.
It also activates the closed loop overvoltage controller but the operation is always
of type ‘PI’ in closed loop control modes.
0 “Off” - Controller switched off
Both open and closed loop overvoltage controllers are off.
1 “On:NoRamping” – Activated P-Controller type operation
Both open and closed loop controllers are activated.
Open loop controller is a P-type controller.
Closed loop controller is a PI-type controller.
2 “On: Ramping” – Activated PI-Type controller
Both open and closed loop controllers are activated.
Open loop controller is a PI-type controller.
Closed loop controller is PI-type controller (as in selection 1).
P1.6.5.2
1262
Overvoltage reference select “OverVolt.Ref.Sel”
Overvoltage reference level depending on the status of the brake chopper. In closed
loop control, the overvoltage controller level is adjusted by “OverVoltageRef.”
The parameter can be found in the CL setting parameter group.
ID1262
Brake chopper in use
Brake chopper not in use
0/High voltage
500 V Unit: 844 V
690 V Unit: 1164 V
500 V Unit: 797 V
690 V Unit: 1099 V
1/Norm.Voltage
1.25*Estimated DC
nominal voltage
1.18*Estimated DC nominal
voltage
2/BrakeChLevel
1.07*brake chopper level
Brake chopper level
P1.6.5.3
504
Brake chopper “Brake chopper”
When the AC drive is decelerating the motor, the inertia of the motor and the load are
fed into an external brake resistor. This enables the drive to decelerate the load with a
torque equal to that of acceleration (provided that the correct brake resistor has been
selected). See separate Brake resistor installation manual. Brake chopper test mode
generates pulse to resistor every second. If the pulse feedback is wrong (resistor or
chopper is missing) fault F12 is generated.
Over voltage reference
select
Brake chopper level
0/High voltage
500 V Unit: 797 V
690 V Unit: 1099 V
1/Norm.Voltage
1.18* Estimated DC nominal voltage
2/BrakeChLevel
Brake chopper level
0 = “Not Used” - No brake chopper used
Brake chopper not active or present in the DC link.
1 = “On, Run” - Brake chopper in use and tested when running.
The drive’s own brake chopper is activated and operational when the drive is in
Run state. The drive also sends test pulses for feedback from the brake resistor.
2 = “External” - External brake chopper (no testing)
The system has an item that handles the DC link voltage. This could be a system
with AFE or there is an external BCU unit. When this option is selected the drive
overvoltage level is set a little higher so that its operation does not conflict with
AFE or BCU units.
3 = “On, Run+Stop” - Used and tested in READY state and when running
Brake chopper is also active when the drive is not in Run state. This option can be
use e.g. when other drives are generating but energy levels are low enough to be
handled with only one drive.
4 = “On, No test” - Used when running (no testing)
Brake chopper is active in Run state but no test pulse to resistor is generated.
The overvoltage controller level is
set to a little lower, see parameter
P1.6.5.2.
In the system menu there is a
parameter “InternBrakeRes”.
This parameter is used for brake
resistor overheating calculations.
If an external brake resistor
is connected to the drive the
parameter should be set to ‘Not
connected’ to disable temperature
calculation for the brake resistor.
