GE Industrial Solutions GERAPID 2607, 4207, 6007, 8007 with arc chutes 1X2, 1X4, 2X2, 2X3, 2X4 - Manual (Page 8)

8 Design and specifications are subject to change without notice S47183e rev.03 2010-06-07
3.2.5 ED impulse coil release (Code 12)
• ED impulse release requires an external protective relay
for monitoring a current increase. This relay must be
provided and installed by the customer.
• If a fault occurs, an external relay signal wired into the
capacitors’ control unit (internal NEKO or external C-bank),
causes NEKO unit to discharge its energy into ED coil [Fig.
8]. The coil trips the breaker’s quick latch and opens
breaker’s contacts in less 3ms.
• ED impulse release is an optional accessory. Complete set
consists of ED coil and electronic control unit with C-bank
called NEKO. The external release signal shall be 6 V to
24 V DC, and shall be connected at terminals (-X2 :10 /
:11) in standard wiring scheme.
• Customer supplied capacitor trip unit may be used. Rated
voltage of 300 V and capacity of 2 000 µF is required. In
this case only ED coil will be installed in the breaker.
• WARNING: Firing signal voltage level is between 6 V and
24 V. There should be no spikes on the signal of duration
less 3 ms. This can lead to defect of the NEKO board!
• WARNING: Maximum duration of the firing signal must
not exceed ~1 sec. Longer signal can lead to NEKO
overheat! It is recommended to use an auxiliary contact
in serial connection with firing circuit (-X2 :10/:11). It will
automatically cut off the firing circuit after breaker
opening.
Fig. 8 ED impulse coil with seesaw interface
3.2.6 Auxiliary tripping devices (Code 11)
• The breaker can be equipped with either a shunt trip (ST)
or a zero voltage release (UVR). It is not possible to have
both devices installed in the same breaker. Both devices
are interchangeable.
• In standard configuration, internal voltage converter
(Code 8) transforms external voltage into 24 V DC, which
is required by ST or UVR. Both devices are tripped by a
potential free contact connected as shown in section 4.2.
• Optionally, ST can be connected directly to external
voltage. In this case extinguish capacitors and diode is
used to improve switching of the shunt trip’s coil [Fig 19-
4c]. Double winding shunt trip is available with this option
for 110/125/220 V DC external control supply.
• Optionally, it’s possible to supply both devices directly to
external 24 V DC ( ± 5%). In this case the release signal for
ST shall not be longer 100 ms.
• The ST is used for remote actuation. It is designed for
short time operation with max. duty cycle of 9 %. ST’s
supply is connected through auxiliary contacts, which cut
off supply voltage after opening. This protects ST against
overheating.
• The UVR [Fig. 9] is used for remote actuation and, in
combination with an internal electronic control, for
voltage control.
• The UVR releases at voltage interruption or supply voltage
drop below 20 V. In these cases UVR trips the breaker. It is
therefore possible to use this device in combination with
the electronic trip unit for voltage monitoring, where an
unintended re-start of machines after a temporary
voltage breakdown is to be prevented.
• The UVR is intended for continuous operation. Its rated
power is 10 W.
• Due to its operational mode, the UVR is a self-monitoring
device, i.e. when the breaker is tripped upon a break of
the pilot wire (EMERGENCY-OFF principle).
• NOTE: Manual closing of the breaker with ST installed,
while pushbutton OPEN is pressed and control power
applied, might lead to ST coil’s overheating and damage.
Fig. 9 Zero voltage release
3.2.7 Forced tripping release (Code 13)
• Optionally, the forced tripping release (FT) can be installed
in the breaker [Fig. 10a]. This unit mechanically trips the
breaker, by pressing the pin against the bottom plate.
Force required to trip the breaker is about 30 N (~7 ft-lb).
The tripping pin position is as on Fig. 10b.
Fig. 10a Forced tripping release
(~0.6 in)
(~0.3 in)
F~30 N