ITech IT6000C Series User Manual page 109

Parameter
U n a (V)
79≤U
It is fixed at 35V
U *(V)
here and cannot
S
be set.
Ri a (Ω)
0.5≤Ri≤4
t (ms)
40≤t
d
t (ms)
–
r
a If not otherwise agreed, use the upper voltage level with the upper value for in-
ternal resistance or use the lower voltage level with the lower value for internal
resistance.
The following general considerations of the dynamic behavior of alternators dur-
ing 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.
•
The internal resistance, Ri, of the load dump test pulse generator shall be
obtained from the following relationship.
– U : The specified voltage of the alternator
nom
– I : The specified current at an alternator speed of 6000r/min
rated
– N : The actual alternator speed, unit: round per minute (r/min)
act
•
The pulse is determined by the peak voltage U
the internal resistance R
of U are correlated with small values of R
n
high values of R and t
i
How to recall this waveform from menu (take Test A 12V as an example):
1. Press the composite keys [Shift]+[I-set] (Function) on the front panel to en-
ter the function menu.
Copyright © Itech Electronic Co., Ltd.
Type of system
12V
≤101 151≤U
n
Calculated accord-
ing to the setting val-
ue Us (typical value
58)
1≤Ri≤8
≤400 100≤t
d
–
, and the pulse duration t
i
. For the test voltage U
d
Power Supply Function
Minimum test
requirements
24V
≤202
n
5 pulses at 1 minute
≤350
d
, the clamping voltage U
n
; in all cases small values
d
and t , and high values of U
i d
please refer to ISO16750-1.
A
intervals
,
S
with
n
97