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The unit monitors the true power supplied to a single phase or a symmetrical 3-phase load up to 7,2kW without using external current transformers. For a higher resolution the LMWB has 4 ranges. The overload current can be up to 6 or 12A continuously depending on range. The LMWB has two adjustable set points that can be used for setting either one maximum and one minimum level or two individual min. or max. levels. The status of the load and each level is signalled by separate LED's and output relays.
When the load exceeds the set points an adjustable time delay controls the time from the fault is recognised until the relay drops out. During the delay time the LED related to the set point will indicate the condition by flashing until the relay reacts and the LED being permanently on. The relays can be latched in their fault position by bridging the terminals Y1 and Y2. The LED's will be on during the time where the relays are latched independently of the actual load status.
Releasing the latch can be done by interrupting the power supply or pressing the reset key. The unit is equipped with a start-up delay in order to suppress error messages during machine start. The delay period starts when supply voltage is applied. For a complete load protection the LMWB include a temperature monitor that can be used with the standard PTC resistors used in motor windings. The temperature monitor is overriding the load function on relay 2.
This item replaces the Thiim LMCA series
