Description
The digitally controlled KEV233x and KEV234x provide precision (0.5%
repeatability) high/low line voltage and phase voltage protection
respectively to any three phase generator or motor.
A digitally
controlled voltage window discriminator controls operation and delay of
the voltage low/high alarm relays. The unit measures the zero point
crossing and the true r.m.s. voltage value, and accuracy is independent
of any wave form distortion.
The auxiliary voltage is supplied
from the unit voltage inputs. A DC or AC auxiliary voltage input is
optionally available. A green LED indicates POWER on. Start of
monitoring function is delayed when the power is switched on (default 2
secs delay). In this way false tripping during power up is avoided.
The voltmeter and the triple-zone status LEDs give the clear safety message:
- HIGH ALARM
- NORMAL
- LOW ALARM
Red alarm lamps LOW (under voltage) and/or HIGH (over voltage) flash
instantly (approx. 1 flash per second) on passing the lower and/or upper
voltage differential set points. The lamp changes state and the trip
relay operates after the pre-set delay. If a fault condition ends during
the delay interval, the timer will automatically reset.
The
voltage differential set points can be user-adjusted to suit most
applications. Trip levels and delays are settable on unit rear.
Operation of the status trip relay is inverted (fail safe), i.e. the
relays are energised during normal conditions.
If one phase
voltage is below the low trip level and, simultaneously, another phase
voltage exceeds the high trip level then both relays will operate.
The
class 1,5 moving iron DIN96 voltmeter must be connected directly to any
phase or via a selector switch to read all three phases. The unit has
low-reflection glass to ease reading at a distance.
The "Pathfinder" function identifies the phase(s) causing the trip by flashing pattern of the relevant LED(s).
The F-versions have an isolated output proportional to the at any time highest measured voltage.
The unit meets EN 61010-1 Cat. III, Pollution degree 2 and the relevant
environmental and EMC tests specified in EN 61326-2-4 to comply with the
requirements of the major Classification Societies.
