Repair Instruction - ABB RET670 Installation And Commissioning Manual

Section 16
Fault tracing and repair
16.2
222
Event message:
INT--TSYNC Off
INT--TSYNC
INT--SETCHGD
DRPC-CLEARED
The events in the internal event list are time tagged with a resolution of 1ms.
This means that, when using the PC for fault tracing, it provides information on the:
• Module that should be changed.
• Sequence of faults, if more than one unit is faulty.
• Exact time when the fault occurred.

Repair instruction

Never disconnect the secondary connection of a current transformer
circuit without short-circuiting the transformer's secondary
winding. Operating a current transformer with the secondary
winding open will cause a massive potential build up that may
damage the transformer and may cause injuries to humans.
Never connect or disconnect a wire and/or a connector to or from a
IED during normal service. Hazardous voltages and currents are
present that may be lethal. Operation may be disrupted and IED and
measuring circuitry may be damaged.
An alternative is to open the IED and send only the faulty circuit board to ABB for
repair. When a printed circuit board is sent to ABB, it must always be placed in a
metallic, ESD-proof, protection bag. The user can also purchase separate
replacement modules.
Strictly follow the company and country safety regulations.
Most electronic components are sensitive to electrostatic discharge and latent
damage may occur. Please observe usual procedures for handling electronics and
also use an ESD wrist strap. A semi-conducting layer must be placed on the
workbench and connected to earth.
Disassemble and reassemble the IED accordingly:
Description
External time synchronization
status
Any settings in IED changed
All disturbances in Disturbance
report cleared
Installation and commissioning manual
1MRK 504 088-UEN C
Generating signal:
INT--TSYNC (reset event)
INT--TSYNC (set event)