11
Table 2.5-2.
T
y
pes
o
f
im
pa
c
ts
D
egree
o
f
ri
gidit
y
at
tes
ting
T
es
t
Vol
tage
,%
in,
+ 5
%
Am
plit
ude
of
d
y
na
m
ic
v
olt
age
c
hang
es
,
%
U
r
D
ura
tion
of
d
y
nam
ic
v
olt
age
c
hang
es
,
periods
(m
s
)
Voltage dips
1
70
30
10 (200)
Voltage
interruptions
1
0 to 20
100
1 (20)
Voltage
surge
2
120
20
25 (500)
Note - Ur - rated supply voltage.
(Performance criterion B - temporary deterioration in the performance quality
or termination of the established function with the subsequent restoration of
normal functioning, carried out without the operator
’s intervention)
Maintainability is preserved during fluctuations in supply voltage from ~ 187
to ~ 246 V
2.6 Cold start
The most critical moment in the operation of the video camera is the process
of its activation at low ambient temperature. Precisely a cold start can cause
the failure of an expensive video camera. To avoid such cases, the switch is
implemented with preheating of TFortis TH camera housings. The essence of
it is that after power is applied to the unit, initially will be powered heating
elements of camera housings, and only then in 1 hour the video camera itself.
This delay allows obtaining comfortable conditions for starting video cameras
and you will be able to save expensive equipment. This option is on by the
TIMER jumper.
