Technical Documentation
KSR-V – Capacitor-Bank Protection Relay
Rev. 05
9
manual/automatic relay-reset
By setting a relay to “manual reset”, one can inhibit the automatic reset of the relay to the reset state when
the activation by the alarms is reset. This “hold”-condition is stored in the KSR-V non-volatile memory, so it is
correctly available even after supply failure. The user has to reset the relays manually to bring them back to
their reset state.
The manual reset feature should not be used in an environment, where manual resets would be triggered
automatically by an external computer system via bus and if the manual reset would happen too frequently.
The memory chip, which is used to
store the ”hold”-state of the relays has specified some 100000 write
cycles. This is enough for manual operation but it can be exceeded with frequent automatic resets.
4.1 Schematic diagram
This diagram shows the set-up for one single alarm. All of the 32 alarms work similar.
on-delay
off-delay
relay 1
relay 2
relay 3
relay 4
relay 5
relay 6
relay 7
relay 8
output
selector
source
selector
value 1
value 2
value x
value N
comparator
value > limit
comparator
value < limit
limit
limit
trigger selection
DISPLAY
ALARMTYPE
Reset: Auto/Man
