Ampcontrol Pty Ltd
– ABN 28 000 915 542
HPB USER MANUAL
HPBB012 Version 9
– March/2020
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 20 of 61
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viewed on the HDM (Remote Display Module) (level 3, position 2). An insulation test will yield one of the
following results:
a.
“Hardware Fault” – The HPB cannot detect the presence of the CCMB. Check power supply to
the CCMB and all wiring
NOTE
An open circuit connection between the CMMB and power circuit
cannot be detected and will
not display as “Hardware Fault”.
b.
“< 10 MΩ” – The resistance between the power circuit and earth is less than 10MΩ.
c. A value between 10M
Ω and 120MΩ - The resistance between the power circuit and earth ±10%.
d.
“> 120 MΩ” – The resistance between the power circuit and earth is greater than 120MΩ.
WARNING!
The CCMB generates 5kVDC. This high voltage DC is produced, and
applied to the 3 phase lines, even when the high voltage 3 phase
supply is not available. Care should therefore always be taken when
working close to high voltage 3 phase cables/bus etc. An audible tone is
generated whenever the CCMB is active, warning of the presence of
high voltage DC.
CAUTION!
Like all insulation tests, a faulty (open circuit) connection to the power
circuit will create the appearance of a high insulation resistance to
earth. To verify the connection to the power circuit it is recommended
that periodic insulation tests be performed, using the HPB, with a
known resistance (e.g. 50MΩ) or
a short circuit to earth on the line.
This should be done on an isolated system (high voltage supply
disconnected) using control power only.
NOTE
The start input must be held closed for the duration of the test (including
the 3 s delay on HPB 22 kV) which is adjustable between 10 and 25
seconds to allow for the charging of cable capacitance.
Setting the “EFLR Test” Value to “off” disabled the Earth Fault test. If this is done, and the system is
ready to start, the MCR Relay closes as soon as the start input is closed.
6.3 Earth Continuity
The earth continuity function tests for the continuity of the earthing between the outlet and the machine,
via the pilot core in the trailing cable. The pilot core is also used to transfer machine data when a remote
HTU (HPB Termination Unit) is used to achieve machine communication. The pilot resistance is
measured with a DC signal and communications is achieved by a high frequency AC signal.
The HPB Relay can be configured to operate in either Resistor or HTU Mode. The mode is selected in
“Pilot Type”, (level 8, position 1) and defines the type of termination unit to be connected between the
pilot and earth at the machine end of the trailing cable being protected by the HPB Relay.
The advantage of using the resistor mode is that it uses a simple signal and a robust termination device
making the system easy to fault find.
