BECKWITH ELECTRIC M?3311A, Instruction Book, Page: 410 / 450

Appendix E – Layup and Storage
E–1
Appendix E includes the recommended storage
parameters, periodic surveillance activities and
layup configuration for the M‑3311A Transformer
Protection Relay
Storage Requirements (Environment)
The recommended storage environment param‑
eters for the M‑3311A are:
• The ambient temperature where the
M‑3311A is stored is within a range of 5°
C to 40° C
• The maximum relative humidity is less
than or equal to 80% for temperatures up
to 31° C, decreasing to 31° C linearly to
50% for relative humidity at 40° C.
• The storage area environment is free of
dust, corrosive gases, flammable materi ‑
als, dew, percolating water, rain and solar
radiation.
Storage Requirements (Periodic Surveillance
During Storage)
The M‑3311A power supply contains electrolytic
capacitors. It is recommended that power be applied
to the relay (PS1 and optional PS2 redundant power
supply when installed) every three to five years for
a period of not less than one hour to help prevent
the electrolytic capacitors from drying out.
Layup Configuration
The M‑3311A includes a removable lithium battery
backed TIMEKEEPER
®
module (Beckwith Electric
component U25, Figure 5‑10). The TIMEKEEPER
module is the M‑3311A real‑time clock and also
provides power to the unit’s nonvolatile memory
when power is not applied to the unit.
E
Appendix – Layup and Storage
Layup of the M‑3311A requires verifying that the
system clock is stopped. The steps necessary to
verify system clock status are as follows:
▲
CAUTION: Do not use the diagnostic mode
in relays that are installed in an active protection
scheme.
For units with the optional HMI panel
:
1. Verify that the Power Supply (PS) fuses
are installed.
2. Determine the unit power supply rating
by observing the check box below the
PS terminals on the rear of the unit.
3. Apply power to the unit consistent with
the rating determined in Step 2 (see
Section 5.3 , External Connections). The
unit will enter the selftest mode.
4. When the selftests are complete, then
press ENTER to begin main menu.
5. Press the right arrow pushbutton until
SETUP UNIT is displayed.
6. Press
ENTER
to access the
SETUP
UNIT menu.
7. Press the right arrow pushbutton until
DIAGNOSTIC MODE is displayed.
8. Press
ENTER
. A reset warning will be
displayed:
PROCESSOR WILL RESET!
ENTER KEY TO CONTINUE
8
WARNING: All relay functions and protec-
tion will be inoperative while the relay is in
diagnostic mode.
9. Press
ENTER
. Unit will now reset and
DIAGNOSTIC MODE will be temporarily
displayed, followed by
OUTPUT TEST
(RELAY). This is the beginning of the
diagnostic menu.