Schweitzer Engineering Laboratories SEL-701-1, Instruction Manual

Page: 115 / 452

Date Code 20011009
SEL-701-1 Monitor
Settings Calculation
Sequential Events Recorder (SER) Settings
3.57
RTDFLT RTD Fault. Asserts when any enabled RTD is short- or
open-circuited, connected with reversed polarity, or if
communication with the external RTD module is
interrupted. This Relay Word bit is inactive if RTD
monitoring is disabled.
WDGALRM,
WDGTRIP
Winding RTD Temperature Alarm or Trip. WDGALRM
asserts when any healthy motor winding RTD temperature
exceeds its settable alarm threshold. WDGTRIP asserts
when any one or two healthy motor winding RTD
temperatures exceed their settable trip thresholds. Both
Relay Word bits are inactive if RTD monitoring is disabled
or if no winding RTDs are connected.
BRGALRM,
BRGTRIP
Bearing RTD Temperature Alarm or Trip. BRGALRM
asserts when any healthy motor bearing RTD temperature
exceeds its settable alarm threshold. BRGTRIP asserts when
any one or two healthy motor bearing RTD temperatures
exceed their settable trip thresholds. Both Relay Word bits
are inactive if RTD monitoring is disabled or if no bearing
RTDs are connected.
AMBALRM,
AMBTRIP
Ambient RTD Temperature Alarm or Trip. AMBALRM
asserts when the healthy ambient RTD temperature exceeds
its settable alarm threshold. AMBTRIP asserts when the
healthy ambient RTD temperature exceeds its settable trip
threshold. Both Relay Word bits are inactive if RTD
monitoring is disabled or if no ambient temperature RTD is
connected.
OTHALRM,
OTHTRIP
Other RTD Temperature Alarm or Trip. OTHALRM asserts
when any healthy "Other" RTD temperature exceeds its
settable alarm threshold. OTHTRIP asserts when any one or
two healthy "Other" RTD temperatures exceed their settable
trip thresholds. Both Relay Word bits are inactive if RTD
monitoring is disabled or if no "Other" RTDs are connected.
81D1T, 81D2T,
81D3T
Level 1, Level 2, and Level 3 Time-Delayed Over-
/Underfrequency. 81DnT asserts when an over- or
underfrequency (depending on the pickup setting) has been
detected for the duration of the time-delay setting. All three
Relay Word bits are inactive if the monitor is not equipped
with optional voltage inputs.
START Motor Start. Asserts when an internal monitor function calls
for a motor start. A motor start will only occur if a monitor
output contact is programmed and connected to close the
contactor or motor circuit breaker.
Table 3.43 Default SER Trigger Setting Relay Word Bits Definitions
Relay Word Bits Relay Word Bit Definitions