RCMA420-D-2, differential current monitoring device

Differential current monitoring device

Differential current monitoring device RCMA420Product description The all-current sensitive differential current monitoring device RCMA420 is used to monitor grounded systems (TN- and TT- systems) where parallel error or differential flows may occur, the amount of which is constantly greater than zero. These are in particular consumers with six-coil bridge rectifiers or single-use smoothing, e.g. converters, chargers, construction machines with frequency-controlled drives. The RCMA420 can also be used to monitor currents in single conductors. The pre-warning level (50... 100% of the IΔn2 response value) can be used to distinguish between the pre-warning and the alarm. Since the measurement is carried out via the measuring current converter, the device is almost independent of the nominal voltage and current of the investment. All-current sensitive differential current monitoring in grounded 2, 3 or 4-wire systems (TN- and TT- systems) • Monitoring of controlled drives, USB systems, construction machines, printing machines, battery systems, laboratory equipment, wood processing machines, MF welding systems, furniture industry, medical systems, etc. • All-current sensitive current monitoring of normally non-current single-unit conductors (e.g. N- and PE- conductors) The start-up delay is active after the supply voltage is set up. During this start-up period, changes in the measured differential flows do not affect the position of the output relays. The differential current measurement is carried out via an external measuring current converter W20AB... W60AB. The current measurement value is displayed on the LC display. This also means changes, such as: For example, when switching off outputs, it is easily visible. If the response values are exceeded, the response delays start "ton1 / 2." The selected alarm relays "K1 / K2" and the alarm LEDs "AL1 / AL2" will turn on. If the differential current is below the return value (response value plus hysteresis), the return delay "toff" starts. After the end of "toff" the alarm relays turn back to the initial position and the alarm LEDs AL1 / AL2 will be deleted. If the error storage is activated, the alarm relays remain in alarm position and the LEDs will light up until the reset key has been activated or the supply voltage is interrupted. The device function can be tested with the test key. The device parametrization is done via the LC display and the front control keys and can be protected by a password. In case of an error, switch the alarm relay K1 / K2 without delay, the alarm LEDs AL1 / AL2 / ON flash. After the error is removed, the alarm relays return to the initial position automatically or by pressing the reset key.