JYM-I insulation monitor

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editor：admin date：2014-07-22

The insulation monitor is used to monitor insulation condition of the buses and branch circuits. In normal condition, the insulation monitor detects the bus voltage and calculates the insulation resistance of bus vs. ground through the bus voltage. When the insulation resistance is lower than the alarm setting, the insulation monitor will check all the branch circuits in turn to detect the branch circuits with degraded insulation and calculate the insulation resistance, and generate alarm via the LED indicators on the panel. In the meantime, the alarm information is sent to the PCU for display.

Specifications

See Table JYM-I-1 & Table JYM-I-2 for the major technical specifications of Emerson JYM-1 insulation monitor.

Table JYM-I-1 Technical conditions

No.	Item	Technical conditions
1	Ambient temperature	-5~＋40 ℃
2	Relative humidity	≤90％
3	Power supply	DC 80~320V
4	Power consumption	≤70W
5	Weight

Table JYM-I-2 Specifications

SN.	Item	Specification
1	Voltage measurement accuracy (±1V DC~±300V DC)	1.5％(typical 1％)
2	Setting range of insulation resistance of circuit branch	500Ω~50KΩ(default 20KΩ)
3	The number of additional slave units	No more than 4
4	The number of branches to be monitored	No more than 240
5	Measurement accurancy of insulation resistance of branches	20％(typical 10％)
6	Detection time of each branch	3~6s
7	Amplitude and frequency of low frequency signal	About 4V, 10±0.1Hz
8	Communication interface	RS485
9	Alarm point hysteresis	40％