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In other words, the signal »Prot . Pickup« is a collective signal; if it has the state
"True" this represents the message "some protection function has detected a fault".
(The same is true of the respective phase-selective signals.)
• Moreover, every »Pickup« triggers a »Trip« (in general: after a dedicated timer stage
•
has elapsed).
The »Trip« triggers a general trip signal »Prot . Trip« (just the same way as the »Prot .
Pickup« is triggered). So, if »Prot . Trip« = "True" this represents the message "some
protection function has detected a fault that persists for a time longer than
tolerable". (And again, the same for the phase-selective signals.)
•
• Finally, the protection function issues not only the »Pickup«, but also the trip
command (»TripCmd«), but only under the condition that trip commands are not
blocked.
(There are various methods to intentionally block trip commands. For example, a
general blocking of the trip commands of all protection functions can be achieved by
setting [Protection Para / Global Prot Para / Prot] »Blo TripCmd« = "Active". See the
full User Manual for details.)
• It is important to know that the trip command of a protection function does not
•
necessarily open a Breaker! Every connected switchgear is represented by a module.
This module has a trip command of its own, which can send an open command to
the assigned output relay, to open the Breaker.
Therefore one additional setting is essential to establish the relationship between
the protection function's trip command and the switchgear's trip command: There
is a so-called "Trip Manager" (which is simply synonymous for the switchgear-
specific menu paths [Control / Bkr / Bkr[x] / Trip Manager]); besides some Breaker-
specific settings (switching times, latching, etc.) you can find there a lot of setting
parameters named »Triggern«, and to each of these you can assign one protection
function's trip command. Then, if any of the assigned protection trip commands
is issued the switchgear's trip command is issued, so that after all, the respective
Breaker opens.
E-Series Family Quick Start Guide
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4 Good to Know for Commissioning
65
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