Controller Protection Under/Over Voltage Protection
______________________________________________________________________________
MillipaK 4QPM Controller Manual Page 60 13/08/03
Under-voltage and over-voltage protection
In order to prevent a sudden loss in power, the controller will begin to linearly ramp down the
current limit, once the average battery voltage falls below a pre-set under-voltage start level. The
current will be ramped down to 0 and a 7 flash fault indicated if the averaged battery voltage falls
below the under-voltage cut-out level.
To protect the controller from over-voltage caused by prolonged regen braking, regen braking will
be reduced when the average battery voltage reaches the over-voltage start level. If the voltage
exceeds the over-voltage cut-out level in braking then the line contactors will open and
freewheeling will occur, requiring the vehicles foundation brakes to be used.
Under any other circumstances if the battery voltage exceeds the over-voltage cut-out level, all
pulsing is stopped and a 7-flash fault is indicated. This protects against incorrect battery
connection.
Nominal
Battery
Voltage
Under-voltage
Cutout
Under-
Voltage Start
(adjustable)
Over-voltage
Start
(adjustable)
Over-voltage
Cut-out
24 V 14.5V 30.0V
36 V 14.5V 45.0V
48 V 14.5V
Under Voltage
Cut-out up to
System V
System V up to
Over Voltage
Cut-out
57.0 V
Table 8: Under and Over-Voltage Cutback Levels
The following calibrator menu items are used to set these values.
Immediate Low Voltage Start
Calibrator Menu Reference:
11.08
Minimum Maximum Step Size Typical Value
Low V
Cutout
System
Voltage
0.5V 18.0V
Immediate Low Voltage Cutout
Calibrator Menu Reference:
11.09
Minimum Maximum Step Size Typical Value
14.5V Low V Start 0.5V 16.0V
Immediate High Voltage Start
Calibrator Menu Reference:
11.10
Minimum Maximum Step Size Typical Value
System
Voltage
High V
Cutout
0.5V High V Cutout
To Next Page
Loading...
