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Introduction to the manual and the ZEV system for motors in explosive atmospheres.
Visual and functional overview of the basic electronic motor-protective relay unit ZEV.
Details on ZEV series relays and their current monitoring sensors, covering 1 to 820 A.
Explanation of using thermistors for indirect temperature monitoring via T1-T2 input.
Connecting PTC probes for full motor protection against overheating, with resistance curves.
Implementing a current monitor for high limit and short-circuit in the thermistor circuit.
ZEV system's response to phase failures with imbalance detection and delay time.
Functionality for monitoring earth faults using auxiliary core-balance transformers.
Achieving EEx e protection and setting overload monitoring for motors.
Correctly setting overcurrent protection for safe motor shutdown within temperature rise time.
ZEV system compliance with IEC/EN, ATEX directives, UL, and CSA.
Guidelines and warnings for ZEV unit mechanical and electrical installation.
Instructions for mounting ZEV units and ZEV-XSW current sensors on DIN rails or busbars.
Specifications for conductor cross-sections of auxiliary cables.
Procedures for removing ZEV units from DIN rails and disconnecting cables.
Procedure for disconnecting the ZEV-XVK-... connecting cables.
Overview of ZEV unit settings and operation using the MODE, UP/DOWN, RESET/TEST buttons.
Explanation of various error and status messages displayed by the ZEV unit.
Details of rating plates for ZEV relay and ZEV-XSW current sensors.
Graphical representation of tripping curves for different classes under 3-phase conditions.
Technical drawings and dimensions for ZEV relays and ZEV-XSW current sensors.
General