Replacing Hardware Units - ABB REG316 4 Series Operating Instructions Manual

REG 316*4 1MRB520049-Uen / Rev. C
7.6.

Replacing hardware units

Qualifications
Hardware units may only be replaced by suitably qualified
personnel. Above all it is essential for the basic precautions
concerning protection against electrostatic discharge be ob-
served .
It may be necessary to transfer existing settings from the relay or
download new ones to the relay, procedures which assume fa-
miliarity with the HMI.
Note that incorrect handling of the devices and their component
parts can cause damage (to the devices or the plant) such as:
· false tripping of items of plant in operation
· destruction of main c.t's and v.t's etc.
The following are basic precautions which have to be taken to
guard against electrostatic discharge:
· Before handling units, discharge the body by touching the
station ground (cubicle).
· Hold units only at the edges, do not touch contacts or com-
ponents.
· Only store and transport units in or on the original packing.
Tools required
Relays can be opened at the rear. The backplates are secured
either Philips screws or Torx screws. Accordingly one of the fol-
lowing is required:
· Philips screwdrivers No. 1 and No. 2
or
· Torx screwdrivers No. 10 and No. 20.
Terminal screws are always of the normal slotted type. No other
tools are required.
Procedure
Follow the check list in the Appendix of
hardware units.
The check list is primarily intended for replacing defective units
by ones of the same type (same code). If a different relay con-
figuration is desired or necessary, units may be have to be re-
ABB Switzerland Ltd
Index 12 when replacing
7-25