21 Load control relay for external disconnect Page 102 of 142
MCS301 meter - product Manual 1.25 MetCom Solutions GmbH
21.3 Disconnect control by load limitation
The limiter control is intended to limit the demand at a defined value. The limiter issues a
command to disconnect the internal relay when the monitored value crosses the threshold value
and stay for specific time duration.
The limiter control acts as internal process and change the relay state from “connected” to
“ready for reconnection” and vice versa.
Two disconnecting modes with separate threshold parameters can defined by the meter:
• Normal Operation;
• Emergency Operation;
21.3.1 Load limitation in “Normal operation”
Demand limitation in normal condition is adjustable when energy is transmitted from network to
the consumer.
• Whenever the average Power exceeds the normal demand limitation ("y" kW) for more
than "x" sec., the internal relay (contactor) will be opened and move to "Ready for
Reconnection" state.
• If the relay is opened due to exceeding normal demand limitation it remains opened (stay
in “Ready for Reconnection state”) for a time interval of "T1" min. Afterwards it closes
automatically (move to "Connected" state). It can alo be reconnected manually or by
other automatic mechanism (e.g. scheduler)
• The number of opening of the internal relay after exceeding Normal demand threshold is
adjustable (parameter n1). After "n1" times of opening and closing, if the consumption
remains more than the demand limitation (Normal threshold), the relay moves to “Norm.
Final State”.
• The “Norm. Final State” can be “Connected” or “Ready_for_reconnection”.
o In case of choosing “Connected” as “Norm. Final State”, the costumer's load
should be reconnected and stay connected until central system sends
disconnection command.
o In case of using “Ready_for_reconnection” as “Norm. Final State”, if the
customer was disconnected, the costumer's load will be disconnected and stay in
this state until central system send reconnection command (after selecting
appropriate relay mode) or connected manually by customer. Also the customers
load will be connected after finishing timeout time (T5).
21.3.2 Load limitation in “Emergency operation”
Whenever the emergency profile is activated or deactivated, an active final state is ended and
the counters for opening and reclosings are resetted. The load limitation with an activated
emergency profile works exactly like the normal load limitation with some different parameters:
• Emergency Threshold
• Emergency number of allowed reclosing
• Emergency reset timeout
• Emergency connection mode of the final state
To Next Page
Loading...
Need help?
General