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Monitoring Devices

Model :VMD-01
Function Under voltage and Over voltage Monitor for single Phase.
Operating Voltage Range -35% to 20% of the rated Voltage
Rated Frequency 50Hz ± 3%
Control Output 1 C/O rated for 5A@250V AC, resistive load
Setting Accuracy ± 15V
Variation due to frequency change ± 1% for every percent change in frequency
Ambient temperature Operating: - 10° C to + 50° C
Storage : - 25° C to + 80° C
Service Life (under no load) 106Operations minimum
Electrical Life (under full load) 105 Operations minimum
Connections Screw type terminals with self lifting clamps
Dimensions 45 x 75 x 116mm [W x H x D]
Power Consumption AC approx. 18W
Insulation Resistance >100M ohms @ 500V DC
LED indications: Power ON
Under voltage
Over voltage
Relay ON
Setting Range 65% to 95% of 240 V AC
105% to 120% of 240 V AC
Hystersis 10 V ± 2V
Trip Time Delay 2 sec to 20 sec adjustable ± 2 sec
Power On delay 2 sec to 20 sec adjustable ± 4 sec
NOTE: delay pot common for trip time & power ON
Descriptive Strength a) 2.5KV AC,50Hz for 1minute.(Between current carrying and non-current carrying parts)
b) 1.5KV AC, 50Hz for 1 minute.(between contacts and control circuit)
c) 1 KV AC, 50 Hz for 1minute.(Between non-continuous relay contacts)
Mode of Operation Auto / Manual
Rated supply Voltage 240V AC
Enclosure (series) B1D series
Issued Date: 23/08/02