10
ELVO E911D/E911A/E912A
2.6
MAINS PROTECTION
ELVO soldering stations comply with the requirements of DOD-STD-
2001-1, MIL-S-45743E, WS6536E and more. Electronic zerovoltage
thyristor switching protects voltage and currentsensitive units and com-
ponents against transient voltage spikes (computer, C-MOS compo-
nents). Soldering tip is grounded to ensure a voltage leakage of less
than 2 millivolt.
2.7
THE ESD WORKING PLACE
The ELVO technology includes a series of precautions for unproble-
matic soldering of MOS-electronic elements.
For working on high integrated MOS-elements with very fine struc-
tures like VLSI we recommend to build up a working place as men-
tioned below.
☞
Please do not use the SL as service ground because it may
be connected with the neutral conductor and consequently
may not be free from disturbing voltages (e. g. unsymmetrical
three phase mains).
☞
Please note that a short in a defective instrument can induce
a high pulse with voltage peaks of more than 100 V.
▲
!
2.4
MECHANICAL PRECAUTIONS
Avoid subjective procession !
To guarantee a long standing stability in accordance to international
rules, referring to security and reliability, all spare parts listed within
this manual must be replaced with original items only.
In case of a component failure, only the assembly of an original, recog-
nized component, will further the longevity.
2.5
ELECTRICAL PRECAUTIONS
AN ELECTRICAL SHOCK CAN BE FATAL !
It is at the own risk of the operator of an opened appliance, to under
stand the resulting danger of the above and to take the corresponding
measures to protect third parties. Memorize the dangerous areas, which
are exactly described in this manual. You should never touch simulta-
neously circuits and earth connections, during the installation or when
servicing.
▲
!
▲
!
ELVO E911D/E911A/E912A
23
7.2
BLOCK DIAGRAM E911A
0
20
40
60
80
100 %
IST
Mains supply
T
ransformer
Separate mains transformer
Zero voltage detector
Switch
Heat display
Soldering ir
on
Heater element
Temp. - Sensor
Controller
Comparator
Standby
Nominal
Mains r
emote
contr
ol
Rectifier
Potential equalization
on housing and
working base
Connector
Tip point
Soldering station