10
Table of Basic Functions Section 1-3
1-3 Table of Basic Functions
There are three ways for the S8M's tripping function to operate: tripping by
user-set parameters, tripping by the S8M's system monitor, and tripping by
external operation.
There are three outputs: the Tripping Alarm Output, Alarm Output, and Over-
temperature Output.
Tripping/Alarm Functions
Note (1) There are redundant overcurrent protection functions in the S8M-CP04-
RS.
(2) The tripping function operates within 100 ms when the S8M is set to stan-
dard detection and within 20 ms when it is set to instantaneous detection.
(3) The alarm is output within 100 ms when the S8M is set to standard de-
tection and within 20 ms when it is set to instantaneous detection.
(4) Run time alarms are disabled when the time parameter is set to 0.0 kh.
(5) The TRG signal applies only to the branch outputs for which the external
tripping input is enabled. For details, refer to page 67.
Setting Operating range Parameter
settings
Outputs cut off External
output
Error code
displayed
Abnormal voltage
tripping
Automatically trips for voltage over
28.8 VDC for more than 10 ms.
None All branch outputs TRP output
OFF
A10
Short-circuit cur-
rent tripping
9.0 A for more than 10 ms None Individual branch
output
TRP output
OFF
A11
S8M-CP04-RS only: Trips within 0.5
s for current over 4.0 A. (See note 1.)
None Individual branch
output
TRP output
OFF
A11/Current
(alternating)
Abnormal current
tripping
(See note 2.)
S8M-CP04-R and S8M-CP04: 0.5 to 4.0 A
(in 0.1 A units)
Individual branch
output
TRP output
OFF
A11/Current
(alternating)
S8M-CP04-RS: 0.5 to 3.8 A (in 0.1 A units)
Overvoltage alarm 20.0 to 28.8 VDC (in 0.1 V units) None ALM output
OFF
A20/Voltage
(alternating)
Undervoltage alarm 18.0 to 26.4 VDC (in 0.1 V units) None A21/Voltage
(alternating)
Overcurrent alarm
(See note 3.)
S8M-CP04-R and S8M-CP04: 0.5 to 4.0 A
(in 0.1 A units)
None ALM output
OFF
A22/Current
(alternating)
S8M-CP04-RS: 0.5 to 3.8 A (in 0.1 A units)
Run time 0.0 to 99.9 kh
(99,900 hours ≅11.4 years, see note 4)
None ALM output
OFF
A23/Time
(alternating)
Over-temperature
output
25 to 80°C
Set value + 1°C for 1 s continuously
None TMP output
OFF
A30/Temper-
ature (alter-
nating)
External tripping
input
External input signal (TRG) ON Specified output (See note 5.) --- TRG
Support Tool Click the Connect Output Buttons for the desired outputs in the
Present Values Window.
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