8
4.4.3
Leakage monitoring
For leakage monitoring (terminals E1 and E2 or E3 and E4), depending on the device configuration,
either conductance testing or float switch mode can be parameterized.
•
Conductance testing selected: If the conductance exceeds the parameterized limit,
switch-off occurs when the conductance value has been continuously exceeded for
the set switch-off delay time. The function can also be parameterized for values falling
below a set conductance value. Conductance is tested using AC voltage to prevent
the risk of electrolysis in the system. It is possible to use the grounded motor housing
as a second electrode for conductance testing. In this case, the grounded motor
housing must be connected to E2 or E4.
•
Float switch mode selected: Switch-off occurs if the float switch reaches its target
position (NC and NO mode parameterizable).
4.4.4
Phase monitoring
Phase monitoring includes the monitoring functions: Overvoltage, undervoltage, phase sequence,
phase failure and phase asymmetry.
Phase monitoring (terminals L1, L2, L3 and FE) is active 6 s after the motor is started.
When the motor is stopped, phase monitoring is deactivated for approx. 2 s to prevent unwanted
switch-off due to the machine running temporarily in reverse.
With the phase input, it is possible to read in up to 690 V AC at a frequency converter capacity of
20 - 100 Hz. To ensure adequate separation between the device and the phases, the phases are read
in via a high-resistance input.
4.4.4.1 Phase failure:
Monitored throughout the entire motor runtime. The alarm relay is switched off when the
parameterized percentage of a phase, measured against the average of all three phases, is exceeded.
4.4.4.2 Phase sequence:
Correct phase sequencing is monitored for 5 s. If the phase sequence is incorrect, the alarm relay
switches off.
4.4.4.3 Phase asymmetry:
Monitored throughout the entire motor runtime and is the percentage deviation of a phase, measured
against the average of all three phases. The warning or alarm relay is switched off when the actual
value exceeds/falls below the value set in the protection device in %.
4.4.4.4 Undervoltage and overvoltage:
Monitored throughout the entire motor runtime. When the warning or switch-off limit set in the
protection device is reached, the warning or alarm relay is tripped.
4.4.5
Analog input
In the extended version, a 0-20 mA measuring signal can also be read in. Switch-off occurs if the
value exceeds/fall below a set switching point.
