Installation on the transformer
On the transformer, several mounting locations may be available for installing the eDOC. Care should be taken to select
a mounting location where the product will be exposed to maximal oil flow and minimal oil temperature. The following
table can be used to help select the best location.
Location
Radiator return (bottom)
Drain valve (bottom tank)
Top tank (fill valve)
Top of radiator
Table 2
Wiring
Select cabling according to your communication needs. Refer to the table below for recommended cable gauge or cable
type. Always comply with national codes and electrical standards.
Cable
Power
Ground
RS-485
Alarm Relays
4-20 mA
Ethernet (SCADA)
Optical Ethernet
Ethernet (service port)
USB
RTD cable
Table 3 - Recommended cable gauge and type
WARNING
To maintain the eDOC IP67 rating, all cables must have a
diameter of 13 to 18 mm when used with standard cable glands
(M25x1,5 plastic type). All cable glands must contain a cable. If
necessary, tape can be used to adjust for the minimum required
diameter. Failure to comply may result in water infiltration and
the presence of electrical shock hazards.
Communication
The digital protocols supported by the product are Modbus, DNP3, and IEC 61850. Modbus and DNP3 are available on
the RS-485 serial interface, the Ethernet SCADA port or the optical Ethernet port. IEC 61850 is available on the Ethernet
SCADA port or the optical Ethernet port.
Table 4 below shows the default RS-485 serial configuration. These default values can be modified at any time using the
built-in web interface
Baude rate
Data bit
Stop bits
Parity
Flow control
Table 4: Default RS-485 configuration
When using Modbus, the default slave ID is 1, and when using the DNP3, the default outstation ID is 4.
6
Benefit
• Good oil flow
• Low operating temperature
• Ease of access
• Low operating temperature
• Ease of access
• Permanent availability
• Good oil flow from thermal convection
• Good oil flow
Type
12 AWG/14 AWG
10 or 6 AWG
24 AWG
12/14/16 AWG
18 AWG
Category 5 cable
ST-ST Plenum Duplex
62 5/125 Multi mode fiber
Category 5 cable
USB type A
-
Issue
• Connection flange rarely present
• Low oil flow may increase reaction time
• Sludge could accumulate here
• To verify if exist and internal bend pipe , in this case this position
is not recommended
• Temperature may exceed 100 °C
• Access is difficult
• Installation requires working at height
• Mandatory power down of transformer during installation
• Temperature may exceed 100 °C
• Access is difficult
• Installation requires working at height
• Connection flange rarely present
• Mandatory power down of transformer during installation
Maximum length
15m (50 ft)/ 10m (30ft)
15m (50 ft)
1220m (4003 ft)
100m (328 ft)
100m (328 ft)
100m (328 ft)
2000m (6562 ft)
3m (10 ft)
-
-
9600
8
1
None
None
OIL DIAGNOSTIC DEVICE TYPE EDOC