ITech IT6513C - Page 56

Function and Features
Copyright© Itech Electronics Co., Ltd. 48
t
d
(ms)
40≤t
d
≤400
100≤t
d
≤350
t
r
(ms)
10
−5
0
10
−5
0
a
If 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.
LOAD DUMP, SINGLE PULSE - WITH CENTRALIZED LOAD DUMP SUPPRESSION
TEST PULSE 5B
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
U
N
=12V
U
N
=24V
U
S
a
(V)
79≤U
S
≤101
151≤U
S
≤202
5 pulses at 1 min
intervals
U
S
*(V) 35
As specified by
customer(typical
value 58)
R
i
a
(Ω)
0.5≤R
i
≤4
1≤R
i
≤8
t
d
(ms)
40≤t
d
≤400
100≤t
d
≤350
t
r
(ms)
10
−5
0
10
−5
0
a
I
f 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.