SAMWHA Product

1ph or 3ph Voltage Monitoring relay

Installation: 8 Pin Socket

Model: DSP-DVR, DVR-M

Operation based on the direct line voltage detection

Rated Line Voltage → 100 ~ 500VAC

Over/Under Voltage protection within (+), (-) 20% to line voltage

Possible to preset operation time for over/under voltage each, respectively.

Perfect check for initial line state
a)"dt" (trip delay time) mode is preset "OFF"

Preset "a" in "out" mode:
Main trip output(95-98) is energized (Open → Close) in case the rated line voltage with normal forward phase state is sensed initially
Main trip output(95-98) is trip as showing a trip cause if the initial line state is under over/under voltage, reverse phase, voltage unbalance
v.OFF is shown in case the line voltage is not sensed initially or voltage is dropped to zero(0) while the normal operation is doing
Preset "b" in "out" mode:
Main trip output(95-98) is not energized (Open→ Open) in case the rated line voltage with normal forward phase state is sensed initially

b)"dt" (trip delay time) mode is preset a value(time)

Preset “a” in “out" mode: Main trip output(95-98) is energized (Open→ Close) after "dt" is elapsed in case the rated line voltage with normal forward phase state is sensed initially
Main trip output(95-98) is still opened(not trip) even after "at" is elapsed if the initial state is under phase loss, also "PL' is shown
"rp" is shown as main trip output(97-98) is still opened(not trip) after operational trip time(0.5sec) without concerning with "dt" if reverse state is sensed initially

Trip cause is shown by characters and/or numbers

3 phase line voltage/ average voltage and / or frequency is shown ordery every 3sec

Alarm history, latest 8 trip events

Reset after a trip: auto or manual

Self-diagnostics to check if this relay is ready to work or not

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