Sevcon Dragon8 - Electrical Specifications

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Electrical
Input voltage – control supply
Nominal working voltage:
12V to 24V
Working voltage limits:
8V to 36V
Input protection:
Input protected against reverse connection of
battery
Table 4 - Input voltage - control supply
Input voltage – DC Link supply
Nominal working voltage:
72/96V
Working voltage limits:
36V to 90V/50V to 140V dc
Non-operational overvoltage limit:
96V/145V dc
Input protection:
User must ensure that reverse polarity protection is
provided external to the controller, for example by
control of the main line contactor.
Surge protection
The Dragon8 controller has an in-built DC-Link
pre-charge circuit to minimise inrush current.
Ground fault detection
User must ensure that ground fault protection is
provided external to the controller, for example by
control of the main line contactor.
Table 5 - Input voltage - traction supply
Motor Output protection
Output current:
Reduced automatically from peak to continuous rating depending on the time a
peak load is applied to the controller.
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 Dragon8 detects valid output loads are present before applying
drive current.
Table 6 - Motor output protection
Repetitive short circuits may damage the controller.