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Design
The
short circuit indicator type SFM consists of
1 pc. reading instrument,
3 pcs. sensors
connection cable
The reading instrument is available as a panel-mounted instrument and
can be equipped with a remote indication contact.
The sensors consists of single sensors; their cable length can be
adjusted by request.
The cables are connected to the reading instrument according to the
information on the wiring diagram. |
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Function
The sensors can be mounted
1) onto the bushings of the switchgear.
2) onto the screened cable of the switchgear.
3) on the places where the short circuit shall be detected.
In case of a short circuit, a current impulse is generated via the
sensor - due to the high short circuit
current. This current impulse is transmitted to the reading instrument.
The evaluation is performed in the reading instrument.
Indicaton: A short circuit is
indicated by indication flags for each cable.
Reset: The short circuit
indication is reset manually via a push button.
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Assembling
(Please
observe the mounting instruction.)
The sensors have to be fixed at the respective place according to the
assembly instruction.
The panel-mounted instrument has to be pushed into
a prepared
panel-cutout
(dimensions of the cutout: 91.5+0.8 * 44.5 +0.6 mm).
The housing is
equipped with spring clamps as a standard (figure 1).
The housing has to be inserted into the cutout and has to be pushed into the opening with a slight
pressure. |
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Electrical
Connection;
For connecting the sensors, please observe the information shown on the
label on the back of the reading instrument. |
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| Technical Data |
| trip
current: |
short
circuit: 250 / 400 / 600 / 800 / 1000 A (adjustable via DIP-switch) |
| precision: |
+/-
10 % |
| temperature
range: |
-20°
bis +70°C |
reading
instrumment:
power request (of the
reading instrument) |
manual
reset
not necessary |
| remote
indication contact: |
max.
230 V AC/50...150 W |
| contact
type: |
selectable
- permanent contact / self-wiping contact
(adjustable via DIP-switch) |
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| reading
instrument: |
panel-mounted
acc. to DIN 40700, (WxHxD) 96 x 48 x 63 mm
material: polycarbonate
sensor: 1) specific to switchgear type
2)
cable - sensor (WxHxD) 38 x 38 x 26 mm |
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| protection
class: |
panel-mounted
instrument - IP 46
sensor - IP 67 |
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