4
RMO60TD Designated Use, Functionality
Safe Operation Procedures
• Hazardous voltages of up to 400 V can occur inside RMO60TD. Therefore, it is not permitted to open
RMO60TD.
• Do not insert objects (e.g., screwdrivers, etc.) into the ventilation slots.
• Before putting RMO60TD into operation, check the test set for any visible damage.
• Do not operate RMO60TD under wet or moist conditions (condensation).
• Do not operate RMO60TD when explosive gas or vapors are present.
• The serial interface of RMO60TD should only have external devices connected that meet the
requirements for SELV equipment according to EN 60950 or IEC 60950.
• When setting up RMO60TD, make sure that the air slots of the test set remain unobstructed.
• If RMO60TD is opened by the customer, all guarantees are invalidated.
• If RMO60TD seems to be functioning improperly, please contact the DV-Power (refer to section
”Manufacturer Contact Information”)
after first checking the section Error Messages.
• Do not use RMO60TD without the extra protective ground cables for RMO60TD and winding
connection.
Always establish this connection as the first one before you do any other connections, and separate
this connection as the very last one.
•
Never open the measuring circuit while current flows as dangerous high voltage may occur. This
is indicated by the red discharge LED and the beeper.
Power Supply
• Supply RMO60TD only from a power outlet that is equipped with protective ground.
• Instead of supplying RMO60TD from phase – neutral (L1-N, A-N), it may also be supplied from phase
to phase (e.g., L1-L2; A-B). However, the voltage must not exceed 240 V AC, please refer to the
section Technical Data.
Warning
This is a class A product. In a domestic environment this product may cause radio interference in which
case the user may be required to take adequate measures.
3
Designated Use
The Winding
Ohmmeter RMO60TD is designed for measuring resistances of inductive test objects used
in the electric power industry or similar industries. It is employed for resistance measurement during
manufacturing, commissioning and testing of:
transformers,
on-load tap changers,
generators and electrical motors,
high current busbar joints,
cable splices.
Any other use of the RMO60TD than the ones mentioned above is to be considered improper and will
not only invalidate all customer warranty claims but also exempt the manufacturer from its liability for
repair or exchange.
4
Functionality
4.1 Current Test
The RMO60TD generates a filtered (true) DC current.
RMO60TD test set can measure the winding resistance of any transformer; small or very large, single or
three phase, star, delta or zig-zag connected. There are two independent measuring channels which can
be used to simultaneously measure resistance of up to two windings at the same time.
