Bender RCM420-D-2 B74014002 Fiche De Données
Codes de produits
B74014002
24
TDB401016en / Main catalogue part 4 – Residual current monitors, Residual current monitoring systems / 07.2010
Dipl.-Ing. W. Bender GmbH & Co. KG • Londorfer Str. 65 • 35305 Grünberg • Phone: 06401 807-0 • Fax: 06401 807-259
Subject to change ! – © Dipl.-Ing. W. Bender GmbH & Co. KG, Germany
4.1
Residual current monitor
RCM420
RCM420
Residual current monitor
for TN and TT systems
(AC and pulsed DC currents)
RCM420
Product description
The AC and pulsed DC sensitive residual current monitor RCMA420-D (Type A) from Bender
is designed for fault and residual current monitoring in earthed power supply systems (TN
and TT systems) where an alarm is to be activated in the event of a fault, but disconnection
must be prevented. In addition, the device can be used to monitor single conductors,
such as PE conductors, N-PE connections and PE-PAS connections.
is designed for fault and residual current monitoring in earthed power supply systems (TN
and TT systems) where an alarm is to be activated in the event of a fault, but disconnection
must be prevented. In addition, the device can be used to monitor single conductors,
such as PE conductors, N-PE connections and PE-PAS connections.
The prewarning stage (50…100 % of the set response value I
Δn2
) allow to distinguish bet-
ween prewarning and alarm. Since the values are measured with measuring current trans-
formers, the device is nearly independent of the load current and the nominal voltage of
the system.
formers, the device is nearly independent of the load current and the nominal voltage of
the system.
Applications
• Residual current monitoring in earthed two, three or four conductor systems
• Current monitoring of single conductors de-energised under normal conditions
• Socket-outlet circuits for devices which are operated unattended for a long time and
which may not fail
• Alarm systems, safety devices
• Air conditioning systems, EDP systems
• Cooling equipment with valuable frozen goods
• Canteen kitchens
• Monitoring of earthed power supplies for stray currents
• Impact on N conductors
• Trace heating systems
Function
Once the supply voltage U
S
has been applied, the start-up delay "t" starts. Measured values
exceeded during this time do not influence the switching state of the alarm relays.
Residual current monitoring takes place via an external measuring current transformer.
The actual measured value is indicated on the LCD. In this way any changes, for example
when circuits are connected to the system, can be recognised easily.
The actual measured value is indicated on the LCD. In this way any changes, for example
when circuits are connected to the system, can be recognised easily.
If the measured value exceeds one or both response values, the response delays t
on1 / 2
begin. Once "t
on1 / 2
" have elapsed, the selected alarm relays switch). If the release value is
not reached before the response delay "t
on
" has elapsed, the alarm LEDs "AL1 / AL2" do
not light up and the alarm relays do not switch. The set release time "t
off
" begins when
the measured value again falls below the release value (response value minus hysteresis)
after the switching of the alarm relays. When "t
after the switching of the alarm relays. When "t
off
" has elapsed, the alarm relays switch
back to their initial position. If the fault memory is enabled, the alarm relays remain in the
alarm state until the reset button is pressed or until the supply voltage is interrupted. The
device function can be tested using the test button. Parameters are assigned to the device
via the LCD and the control buttons on the front panel; this function can be password-
protected.
alarm state until the reset button is pressed or until the supply voltage is interrupted. The
device function can be tested using the test button. Parameters are assigned to the device
via the LCD and the control buttons on the front panel; this function can be password-
protected.
Connection monitoring
The CT connections are continuously monitored. In the event of a fault, the alarm relays
K1 / K2 switch without delay, the alarm LEDs AL1 / AL2 / ON flash. After eliminating the
fault, the alarm relays return to their initial position either automatically or by pressing
the reset button (fault memory behaviour).
K1 / K2 switch without delay, the alarm LEDs AL1 / AL2 / ON flash. After eliminating the
fault, the alarm relays return to their initial position either automatically or by pressing
the reset button (fault memory behaviour).
Restart function
If an alarm is pending after resetting the alarm relay and restarting the system being monitored,
this reset process is repeated until the preset number of restart cycles is completed.
this reset process is repeated until the preset number of restart cycles is completed.
As soon as the preset number of restart cycles is completed, the fault memory is set to ON.
Device features
• AC and pulsed DC sensitive residual current
monitor Type A according to IEC 62020
• r.m.s. value measurement (AC)
• Two separately adjustable response values
• Frequency range 42…2000 Hz
• Start-up delay, response delay and delay
on release
• Restart function
• Digital measured value display via LC display
• Measured value memory for operating
value
• CT connection monitoring LED
• Power On LED, LEDs: Alarm 1 / 2
• Internal/external test/reset button
• Two separate alarm relays
(one changeover contact each)
• N / O or N / C operation and fault memory
behaviour selectable
• Password protection for device setting
• Device self monitoring
• Sealable transparent cover
• Two-module enclosure (36 mm)
•
RoHS compliant
•
Push-wire terminal
(two terminals per connection)
(two terminals per connection)
Approvals and certifications