Burkert PTB 03 ATEX 1030 X, Operating Instructions Manual, Page: 11 / 73

11
ApplicationConditionsfortheunits
6. APPliCATion ConDiTions
for ThE uniTs
special conditions 6.1.
short-circuit protection 6.1.1.
Each electromagnet shall be provided on the line with a short-circuit
protection in the form of a fuse designet to meet the magnet starting
current (max. 3 x I
rating
in accordance with IEC 60127-2-1) or a
motor overload trip instantaneous short-circuit and thermal release
(adjusted to match the starting current). For very small rated currents
for the magnets, the fuse with the smallest current value according
to the above-mentioned IEC standard will suffice. This fuse may
be mounted in the associated supply unit or must be connected in
series separately. The rated voltage of the fuse must be equal to or
larger than the quoted nominal voltage of the magnet. The switch-off
capability of the fuse cartridge must be equal to or greater than the
maximum theoretical short-circuit current at the installation location
(normally 1500 A).
In the case of versions A and L of the solenoid, short-circuit protection
must be assured by the operator. In the case of version K of the
solenoid, the fuse is installed in the terminal box of the device. More
detailed descriptions of versions A, L and K are to be found in the
section
7.Technical data .
Fuse ... A
operation with associated valve 6.1.2.
body
The solenoid coils Type 77. / 78. may only be operated with a valve
body satisfying the following requirements.
For the valve body, the following materials may be used:
metal (brass, aluminium, stainless steel) or •
plastics (e,g, polyamide PA 6 GV ...) •
manual operation / approximity 6.1.3.
switch
The solenoid armature can be manually operated via the push
button. The push button may be locked by depressing and turning
by 90°.
As an alternative to manual operation, the solenoid can be equipped
with a proximity switch. The internal code for this version is CF 15.
english
PTB 03 ATEX 1030 X