True RMS SINGLE PHASE VOLTAGE INDICATOR / MONITOR / WINDOW COMPARATOR OVER / UNDER VOLTAGE PROTECTION * other voltages available on request
This device may be used for OVER and / or UNDER voltage protection.
The display may be scaled to any value from 5 to 3500 and the decimal pointer set to any position, allowing it to be configured for use with external step-down transformers.
Each relay is controlled via separate upper, lower and hysteresis set-points. The relays may therefore be configured for both over and / or under, or one for over and the other for under voltage protection.
The start-up and reaction delays are also programmable.
ADDITIONAL FEATURES INCLUDE:
Relay(s) remain energized while monitored voltage remains within pre-set upper & lower values.
Once tripped, the voltage must recover by the pre-set hysteresis voltage (difference between trip & recovery) before the relay operates again.
Display scale: Adjust the display to match the input of a voltage transformer.
Start-up delay: At start-up the relay remains energized for this pre-set time to allow the input voltage to stabilize before monitoring starts.
Reaction delay: (tripp delay) Once energized, the relay will tolerate fault conditions for this pre-set time before the relay is de-energized. This allows for short term fault conditions.
Recovery delay: Whenever the relay is de-activated, it will not operate again until this time has lapsed.
Latch facility: Once de-energized, the relay will not operate until the short across the latch pins is removed. (even if the fault condition has been corrected).
Auxiliary supply voltage is isolated from the measured AC
standard voltages AC: 110V , 240V , 400V, 525V ±15%
scale 5V - 3050V
upper limit (if full scale = 300V) 0V - 300V
lower limit (if full scale = 300V) 0V - 300V
hysteresis 1V - 300V
start-up delay 0 - 99 seconds
reaction delay (tripp delay) 0 - 99 seconds
recovery delay (minimum relay off time) 0 - 99 seconds
calibration 90% - 110%
keypad and menu lock
General information all parameters are saved to non-volatile eeprom memory, thus eliminating the need to re-program after a power failure
Technical information TRUE RMS by taking ±180 readings per cycle
All parameters are saved to non-volatile eeprom memory, thus eliminating the need to re-program after a power failure
Accuracy: 1% of full scale Typically 0.5% at 25 °C.
Scale: 5 to 3500 (in steps of 5)
Full scale input voltage: 300V RMS
Supply voltage: +-15% of rated voltage