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Innovative New ZEV Delivers Ultra-Compact Electronic Motor Protection up to 820A
![[picture of ZEV]](images/zev_p.jpg)
Industry’s most innovative motor protection company is pushing back the boundaries once again! The ZEV from Moeller Electric is an ultra-compact, flexible yet easy-to-use electronic motor protection system that is ideal for motors across a wide range of currents.
Employing the very latest sensor and transformer technology, the new ZEV provides much more than just the highly effective protection of the motor in the event of phase failure, overload or current imbalance.
An earth fault is quickly detected using an external core balance transformer. The integrated thermistor relay allows for the connection to external thermistors fitted within the motor. For ease of engineering, the multivoltage ZEV module automatically adapts to different voltages within the range 24–240V 50/60Hz and 24–240V DC which makes it suitable for most commonly used control voltages.
One of the most striking aspects of ZEV is its small size, which is complemented by four ultra-compact transformers covering the entire current range 1A to 820A. Three of the transformers are housed in small lightweight enclosures whose volumes are only a tiny fraction of that of conventional transformers. Add to this huge reduction in transformer size a considerably smaller and easier to handle current sensor and the ZEV really comes into its own in applications where space is at a premium.
Installation of the fourth ZEV transformer, the XSW current sensor with a sensing range of 40-820A, is very simple with small lightweight sensor belts laid around the conductor. There is no need for cumbersome installation and connection of large transformers with thick conductors, or for drilling holes in the mounting plate. Instead, the sensor is affixed simply using a Velcro® fastening.
The ZEV's front panel, incorporating an LCD and four pushbuttons, provides users with an aesthetic and easy-to-operate interface. The integral LCD provides details of all the system's functions, operating states and settings. Up/down buttons allow currents to be set accurately to one decimal place and are also used to change tripping classes or auxiliary contact functions. The reset/test button can be used to reset the device after tripping or to activate a test function. The mode button allows access to the function menus.
The ZEV provides differential signalling. The customer-configurable auxiliary contact function allows different parameters to be used to signal overload, early warning of overload, earth fault or thermistor tripping. The display of the three phase symbols L1, L2 and L3 allows the faulty phase to be identified quickly when faults occur, which is then communicated by the appropriate symbol flashing conspicuously on the LCD. In the event of a fault the LCD shows the instigating parameter.
Even the most severe of starting situations can be dealt with by the ZEV motor protective system. Its enhanced tripping classes allow motors with starting times of up to 40 seconds to be safely protected. Protection is optimally set by preselecting one of the eight tripping classes between 5 and 40.
