S&C Instruction Sheet 515-600 27
Field Adjustment and Programming
STEP 5.
Set the time-related operating parameters of the Micro-AT control using the
following procedure.
(a) Press the TIME menu key. The following display will appear:
VOLTAGE:
PRESS LAST/NEX T ITEM
(b) Press the NEXT item key. The first item of the
Time
menu will appear on the
first line of the dis play:
TIME: LOSS OF LEFT SOURCE
(c) Press the NEXT item key repeatedly to scroll to each item of the
Time
menu,
as listed in Table 3. Each item in the
Time
menu is field-adjustable.
Is the factory setting for each item (shown in the last column of Table 3,
in boldface type) appropriate for this installation? If not, change it.
For example, here is the display for
TIME: LOSS OF LEFT SOURCE
with its factory setting, 2.00 SEC ONDS:
TIME: LOSS OF LEFT SOURCE
2 . 00 SECONDS
CHANGE
Time Menu
Table 3. Field-Adjustable Items in the Time Menu
Field-Adjustable Item
TIME:
Description
Displayed If
Operating
Range
①
LOSS OF LEFT
SOURCE
Time delay between detection of loss of voltage on left source and
initiation of automatic loss-of-source transfer
Displayed at all installations
0 .25-240
SECONDS
(2.00
SECONDS)
LOSS OF RIGHT
SOURCE
Time delay between detection of loss of voltage on right source
and initiation of automatic loss-of-source transfer
Displayed at all installations
0 .25-240
SECONDS
(2.00
SECONDS)
RETURN OF SOURCE Time delay between return of preferred-source voltage and
initiation of automatic return-of-source transfer
CONFIG: SELECT RETURN
has been set for “AUTO” or
“WINDOW” return
5 SECONDS
TO 8 HOURS
(00:03:00)
LOCKOUT RESET
Time delay that voltage must remain on load, following
its resumption after a momentary overcurrent, before the
Overcurrent Lockout feature is automatically reset
CONFIG: LOCKOUT OPTION
has been factory-set for
“INTERNAL” or “EXTERNAL”
0 .25-240
SECONDS
(20.0
SECONDS)
OC LOCKOUT
PICKUP
Time delay between detection of overcurrent and initiation of
overcurrent lockout
CONFIG: LOCKOUT OPTION
has been factory-set for
“INTERNAL”
3-100
MILLISECONDS
(50 MS)
TRANSITION DWELL
Time delay, during automatic loss-of-source transfer, between
opening of a source interrupter switch and closing of the other
source interrupter switch . Also, time delay, during automatic
return-of-source transfer, between opening of a source interrupter
switch and closing of the other source interrupter switch
CONFIG: DWELL TIMER has
been set for “IN”
0 .25-10
SECONDS
(2.00
SECONDS)
WINDOW BEGIN
The beginning of a time “window” in which an automatic return-of-
source transfer can occur; the window is adjustable from 1 minute
to 3 hours . (Transfer will take place after the return-of-source time
delay has expired—provided that the time of day is within the
window selected)
CONFIG: SELECT RETURN has
been set for “WINDOW” return
hh:mm
(hour: minute—
24-hour format)
(01:00)
WINDOW LENGTH
(24 HR)
The time duration of the “window” in which an automatic return-of-
source transfer can occur
CONFIG: SELECT RETURN has
been set for “WINDOW” return
hh:mm
(hour: minute—
24-hour format)
(03:00)
TODAY’S DATE
Month-day-year reference for event log
Displayed at all installations
mm/dd/yy
(month/day/year)
TIME OF DAY (24 HR)
Hour-minute-second reference for event log
Displayed at all installations
hh:mm
(hour: minute—
24-hour format)
①
Factory settings are shown in boldface type .
