Function and Features
Description:
• t：time
• U: test voltage
• t
d
：Duration of pulse
• t
r
：Rising Slope
• U
A
：Supply Voltage for generator in operation（see ISO 16750-1）
• U
S
：Supply Voltage
• U
S
*：supply voltage with load dump suppression
Parameter
Type of system
Minimum test
requirements
UN=12V UN=24V
USa(V)
79≤US≤101 151≤US≤202
5 pulses at 1 min
intervals
US*(V)
35
As specified by
customer(typical
value 58)
Ria(Ω)
0.5≤Ri≤4 1≤Ri≤8
td(ms)
40≤td≤400 100≤td≤350
tr(ms)
aIf not otherwise agreed, use the upper voltage level with the upper value for
internal resistance or use the lower voltage level with the lower value for internal
resistance.
The following general considerations of the dynamic behavior of alternators
during load dump apply:
• The internal resistance of an alternator, in the case of load dump, is mainly a
function of alternator rotational speed and excitation current.
Copyright © Itech Electronic Co., Ltd.
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