Appendix; Configure Menu; Voltage Menu - S&C MIcro-AT Installation, Programming, And Operation Manual

Appendix

Table 9. Non-Field Adjustable Items in the Configure Menu
Non-Field-Adjustable Item
CONFIG:
SELECT BUS TYPE
VOLTAGE SENSING
VOLT SENSE CONFIG
SRCE BAD CRITERIA
UNBALANCE INSTALL
VOLT VALUE FORMAT
LOCKOUT OPTION
SUPERVISORY CONTROL
● "SPLTCOM" switchgear has the capability for future conversion to
split-bus switchgear (i .e ., automatic functioning of the bus-tie interrupter
switch as well as the source interrupter switches) .
■ Displayed if CONFIG: VOLTAGE SENSING has been factory-set for
"4 WIRE" voltage sensing .
Table 10. Non-Field Adjustable Items In The Voltage Menu
Non-Field-Adjustable Item
VOLTS:
LEFT PHASE 1
LEFT PHASE 2
LEFT PHASE 3
LEFT UNBALANCE
RIGHT PHASE 1
RIGHT PHASE 2
RIGHT PHASE 3
RIGHT UNBALANCE
● Displayed if CONFIG: VOLTAGE SENSING has been factory-set for
"4 WIRE" voltage sensing .
38 S&C Instruction Sheet 515-600
Setting of the control to accommodate Common bus or Split bus (in switchgear applications), "PAD MNT" bus (in
pad-mounted gear applications) . A fourth setting, "SPLTCOM," applies to split-bus switchgear in which the bus-
tie interrupter switch does not function automatically; the source interrupter switches function as in common-bus
switchgear . Weatherproof enclosure applications use Common bus
●
Setting of the control to accommodate "2 WIRE" voltage sensing provided by one line-to-ground or line-to-line
connected voltage transformer per source . Or, setting of the control to accommodate "4 WIRE" voltage sensing
provided by three line-to-ground connected voltage transformers or—on delta-connected systems only—two line-
to-line connected voltage transformers per source
Setting of the control to accommodate between either monitoring sensors whose primary windings are connected
line-to-line, or monitoring sensors whose primary windings are connected line-to-ground . In both cases the
sensor secondaries must be referenced to local chassis ground
Setting of the control to accommodate a source considered BAD when a single phase drops below the loss-of-
source threshold setting, or a source considered BAD when all three phases drop below the Loss-of-Source
Threshold setting
Setting of the unbalance detection feature "In" or "Out"
Setting of the control to display voltage values in units of Volts or in percentage variance (%), the percentage
values are relative to 120 V
Setting of the Overcurrent Lockout feature is External or Internal mode or "OUT" (depending on whether the
optional Overcurrent Lockout feature—catalog number suffix "Y21"—has been specified)
Setting, "IN" or "OUT," of the capability of the control to accept an external signal to operate manually (depending
on whether the optional supervisory control feature—catalog number suffix "-Y6"—has been specified)
Actual left-source phase 1 voltage after normalizing
Actual left-source phase 2 voltage after normalizing
Actual left-source phase 3 voltage after normalizing
Actual left-source unbalance voltage after normalizing
Actual right-source phase 1 voltage after normalizing
Actual right-source phase 2 voltage after normalizing
Actual right-source phase 3 voltage after normalizing
Actual right-source unbalance voltage after normalizing
Description
■
▲ In Internal mode, the lockout level is field-adjustable at the source-
transfer control . In External mode, the lockout level is determined by
the setting of user-furnished external relaying .
Description
●
●
■
●
●
■
■ Displayed if CONFIG: UNBALANCE INSTALL has been factory-set
for In mode .
▲