Electrical; Input Voltage; Output Protection - Sevcon Gen4 Applications Reference Manual

Electrical

Input voltage

24V only
(Size 2 24V)
Conventional 16.8V to 28.8V
working
voltage range
(Note 1)
12.7V to 34.8V
Working
voltage limits
(Note 2)
Non- 39.6V
operational
overvoltage
limits:
Battery Vnom to 0.5 x Vnom for 100 ms
voltage droop:
Input Input protected against reverse connection of battery
protection:
Note 1: Conventionally the controller may be set to operate without cutback in the range 70% to
120% of the nominal battery voltage, although cutback parameters may be used to set cutbacks
higher or lower than this range. Cutbacks are set by the user for various reasons, including:

Battery protection against high current in deep discharge condition

Providing smoothly reducing performance at extremes of working voltage range, rather
than a sudden loss of function
Note 2: Working voltage range outside which the controller will be non-operational.

Upper working voltage limits for 72V/80V Gen4 is being increased to 120V and will be
rolled out when possible in future Gen4 variants for both PMAC and Induction motor
firmware.

Output protection

Output current: Reduced automatically from peak to continuous rating depending on the
time a peak load is applied to the controller (see Figure 10 on page4-4).
Reduced automatically if operated outside normal temperature range.
Short-circuit: Protected against any motor phase to B- or B+ at power-up.
Protected against any motor phase to another motor phase at any time
during operation.
At switch-on Gen4 detects valid output loads are present before applying
drive current.
4-2
24/36V 36/48V
controllers controllers
16.8V to 43.2V 25.2V to 57.6V
12.7V to 52.2V 19.3 V to 69.6 V
59.4V 79.2 V
72/80V 96/110V
controllers controller
50.4V to 96V 67V to 132V
39.1 V to 116 V 48V to 150V
132 V 150V