TUG MZ Operation Maintenance & Parts Manual page 355

ALLOWABLE
PARAMETER
Nominal Voltage
24–84 V
Nominal_Voltage 1536–5376
Undervoltage Cutback Range
Undervoltage_Cutback_Range
User Overvoltage
User_Overvoltage
Curtis 1234/36/38 Manual,
1 1 J U LY 2 0 0 8 D R A F T
BATTERY MENU
RANGE
Must be set to the vehicle's nominal battery pack voltage. This parameter
is used in determining the overvoltage and undervoltage protection thresholds
for the electronic system.
Overvoltage protection cuts back regen braking to prevent damage
to batteries and other electrical system components due to overvoltage.
Undervoltage protection prevents systems from operating at voltages below
their design thresholds.
The four threshold points are calculated from the Nominal Voltage, Under-
voltage Cutback Range, User Overvoltage, and User Undervoltage parameter
settings and the controller's minimum voltage and maximum voltage ratings:
Overvoltage = Either Max Voltage (see voltage ratings table)
or User Overvoltage × Nominal Voltage, whichever is lower.
Severe Overvoltage = Overvoltage (see previous item) + 10V.
Undervoltage = Either Min Voltage (see voltage ratings table)
or User Undervoltage × Nominal Voltage, whichever is higher.
Severe Undervoltage = Undervoltage point – Undervoltage Cutback Range.
* The Brownout Voltage is determined by the controller base type and cannot
be changed. When the capacitor voltage falls below the Brownout voltage
the bridge is switched off (i.e., motor current is switched off). If the capacitor
voltage stays below the Brownout voltage for > 64 msec the controller will reset
(equivalent to cycling the keyswitch). If the capacitor voltage rises above the
Brownout voltage before 64 msec have passed the bridge will be reenabled.
The Severe Undervoltage point can be set lower than the Brownout voltage.
2.0–14.0 V This parameter sets the voltage range between the Undervoltage and
0–4096 Severe Undervoltage points (see Nominal Voltage description).
A Severe Undervoltage fault will be set if the capacitor voltage falls
below either the Severe Undervoltage point (drive current limit set to 0) or
the Brownout voltage (bridge disabled, motor current set to 0).
115–200 % The value of this parameter is a percentage of the Nominal Voltage setting.
293–512 The User Overvoltage parameter can be used to adjust the overvoltage
threshold, which is the voltage at which the controller will cut back regen
braking to prevent damage to the electrical system.
Typically this parameter is changed only when the controller is being
used in an application at the low end of the controller's range: such as
a 48–80V controller being used in a system with a 48V battery pack. In
this case, the overvoltage threshold can be raised by setting the User
Overvoltage to a higher value. The overvoltage threshold can never be
raised above the controller's power base maximum voltage rating.
Rev. D
3 — PROGRAMMABLE PARAMETERS:
DESCRIPTION
VOLTAGE RATINGS
BROWNOUT
*
CONTROLLER VOLTAGE
24V 15V
24–36V 15V
36–48V 20V
48–80V 20V
80–108V 30V
Battery Parameters
MIN MAX
VOLTAGE VOLTAGE
16.8V 30V
16.8V 45V
25.2V 60V
33.6V 105V
50.4V 130V
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