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Description and operation mode
The relays for permanent control of insulation SRI3/I2 monitors continuously the status of networks with neutral to ground (IT systems). The
instruments can detect insulation faults due to the resistive components, even in the presence of continuous parasitic tensions. The devices are
able to give two different levels of signaling.
The insulation resistance measurement is performed by applying an alternating voltage of less than 24Vp-p (conforms to IEC61557-8) in a self-
adaptive variable frequency. NOTE:In the presence of strong interference or discontinuity in the system, on display of device may flash the value of
the insulation resistance or it can be temporary replaced with the written "EVAL". This means, that this value is subject to verification. At final check,
the value of resistance will return as fixed value.During this procedure, the dispersion resistance will not be measured.
Installation Rerquirement and Safety Precaution
All installation and maintenance operations must be performed by qualified personnel, in the absence of voltage and total electrical safety system,
in compliance with the regulations. See the picture on the first page FIG3 and FIG4 for a right installation.
- Before powering the equipment, check that you have correctly performed all the necessary connections.
- The conductors section must be between 1.5 and 2.5 mm2, except those relating to the serial interface.
- In the case you use the IMD with the expansion SRI3/EXT2, it must mandatory be placed to the left of IMD (insulation monitor device).
Nominal Voltage Un
Distribution System- Type of IMD
Reference Standard
Working temperature
Maximum altitude
Ran (Response value)
Tan in ac (Response time)
Tan in dc or in dc+ac with Ufg >0
Max external voltage in DC Ufg
Ri– Zi (Internal resistance- Impedance
@ 50 Hz)
Accuracy of temperature measured
Threshold values selectable
Minimum/ Maximum voltage range
Number of output contacts
Serial interface
Terminating resistance
All manuals and user guides at all-guides.com
TECHNICAL FEATURES
AC/DC
0 - 500V
DC
0 - 700V
IT - AC/DC IMD
IEC 61557-8
IEC 61326-2-4
-10 ÷ 50°C
2000m
Insulation Measure
5KΩ ÷ 2MΩ
≤10sec (with C disp =1μF)
100sec (with C disp =1μF)
<575Vdc
≥200KΩ
Internal temperature and voltage measure
3°C
50 ÷ 90°C
0 ÷ 700V
Interfaces
3 NO-C-NC
RS485 Modbus RTU
~ 120Ω
Normal activity of insulation control (Green display)
When the instrument is in the normal state of measurement and monitoring, the
following parameters are constantly displayed on the display (green color):
- Insulation Resistance (Ran)
- Line voltage (only if the alarm thresholds are different from zero)
- Symbol of the voltage type
- Internal temperature in °C (only if the thermal alarm threshold is different from zero)
- Graphic representation of the insulation resistance with an histogram which represent
insulation resistance when is between the 2 set thresholds (alarm and fault)
- Contacts status of device
The keys funcions are:
1:TEST- push to perform the test
2: SET- push for at least 3 secs to enter/exit in/from SETUP
3: push for contrast adjustment
4: i- push for product information
Aux Power Supply Us
Consumed power
Overvoltage category
Pollution degree
Protection degree
Storage temperature
Max terminal section
Rf measurable resistance
Relative uncertainty
Max dispersion capacity
Measuring voltage Um
Measuring current Im
Measure Range
Alarm Response time
Accuracy of voltage
measure
Output breaking capacity
Galvanic insulation
115/230Vac(50/60Hz) (for SRI3/I2)
24/60Vdc (for SRI3/I2CC)
<10VA
CAT II
2
IP40 (Frontal)
IP20 (Terminal)
-20 ÷ 80°C
2,5mm²
1KΩ ÷ 10MΩ
2kΩ (1kΩ 20kΩ)
10% (20kΩ 2MΩ)
≤100μF
≤24V
≤250uA
-10 ÷ 110°C
~ 5sec
±5%
250Vac- 3A PF=1
<1kV @50Hz
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