WEG ECW500, Руководство пользователя

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Functional Description .
ECW500 | 53
6.7.10 Analog Input in Current: Loss Protection (PLCI)
This protection indicates if the current at the analog input is below 3.5 mA. When the parameter 31028 (External
Power Module) is set to 1 (enabled), the actuation of this protection will result in shutdown of the regulator.
Otherwise, only a warning will be displayed in the event list.
It is possible to enable or disable this protection through the parameter 31024 and to set its actuation time by
the parameter 31026.
6.8 CRITICAL PROTECTION
6.8.1 Underfrequency Protection
When the system frequency falls below 10 Hz, the ECW500 is automatically turned off and an error is
generated.
6.8.2 Excitation Overcurrent Protection (PEOC)
The protection actuates whenever the excitation current exceeds the level configured by an adjustable time.
Three parameters are available to set this protection: enable/disable (30454), the overcurrent level (30456) and
time for the protection to actuate (30458).
6.8.3 DC Link Overvoltage Protection
If the DC link voltage reaches the maximum value allowed, an error is generated and the ECW500 is
automatically shut down.
6.8.4 Fault Protection on Triggers of the Power Switches
The ECW500 monitors faults on the triggers of the power switches individually. If any of them fails, the ECW500
is automatically shut down and an error is generated indicating which switch/trigger failed. This fault is also
generated in case of a short circuit at the power output terminals.
6.9 DIGITAL RELAY OUTPUT
The ECW500 has six relay outputs to indicate information about the equipment operation. Two relays have
specific functions and four of them are configurable to indicate specific conditions for each operation.
All relays can be configured to Normally Open - NO or Normally Closed - NC.
Also, the four relays which have configurable functions can also be configured for three distinct types of
operation:
■ "Latched", in which the relay remains in the commuted state while the fault exists;
■
"Momentary", in which the relay remains switched in the commuted state for a certain time when the fault
occurs;
■ "Maintain", in which the relay remains in the commuted state until there is a reset of the error/fault that
caused the relay to actuate.
6.9.1 Status Relay
The status relay has fixed function and indicates if the ECW500 in ON (in operation) or OFF.
6.9.2 General Fault Relay
The general fault relay has fixed function and indicates whether there is an error or active fault on the ECW500.
6.9.3 Configurable Relays 0, 1, 2 and 3
The ECW500 has four relays with configurable indication functions indicated by the numbers 0, 1, 2 and 3. The
functions that can be indicated on these relays are shown in the list below:
■ Phase loss;