1.16
SEL-421 Relay Instruction Manual Date Code 20171021
Introduction and Specifications
Specifications
Communications Ports
EIA-232: 1 Front and 3 Rear
Serial Data Speed: 300–57600 bps
Communications Card Slot for Optional Ethernet Card
Ordering Options: 100BASE-FX fiber-optic Ethernet
Fiber Type: Multimode
Wavelength: 1300 nm
Source: LED
Connector Type: LC fiber
Min. TX Power: –19 dBm
Max. TX Power: –14 dBm
RX Sensitivity: –32 dBm
Sys. Gain: 13 dB
Communications Ports for Optional TiDL Interface
EtherCAT Fiber-Optic
Ports: 8
Data Rate: Automatic
Connector Type: LC fiber
Protocols: Dedicated EtherCAT
Class 1 LASER/LED
Wavelength: 1300 nm
Fiber Type: Multimode
Link Budget: 11 dB
Min. TX Power: –20 dBm
Min. RX Sensitivity: –31 dBm
Fiber Size: 50–200 m
Approximate Range: 2 km
Data Rate: 100 Mbps
Typical Fiber
Attenuation: –2 dB/km
Time Inputs
IRIG Time Input-Serial Port 1
Input: Demodulated IRIG-B
Rated I/O Voltage: 5 Vdc
Operating Voltage Range: 0–8 Vdc
Logic High Threshold: 2.8 Vdc
Logic Low Threshold: 0.8 Vdc
Input Impedance: 2.5 k
IRIG-B Input—BNC Connector
Input: Demodulated IRIG-B
Rated I/O Voltage: 5 Vdc
Operating Voltage Range: 0–8 Vdc
Logic High Threshold: 2.2 Vdc
Logic Low Threshold: 0.8 Vdc
Input Impedance: 50 or > 1 k
Dielectric Test Voltage: 0.5 kVac
PTP—Ethernet Port 5A, 5B
Input: IEEE 1588 PTPv2
Profiles: Default, C37.238-2011 (Power Profile)
Synchronization
Accuracy:
±100 ns @ 1-second synchronization
intervals when communicating directly
with master clock
Operating Temperature
–40 to +85C (–40 to +185F)
Note: LCD contrast impaired for temperatures below –20° and above
+70°C. Stated temperature ranges not applicable to UL applications.
Humidity
5% to 95% without condensation
Weight (Maximum)
3U Rack Unit: 8.0 kg (17.7 lb)
4U Rack Unit: 9.4 kg (20.7 lb)
5U Rack Unit: 11.3 kg (25.0 lb)
Terminal Connections
Rear Screw-Terminal Tightening Torque, #8 Ring Lug
Minimum: 1.0 Nm (9 in-lb)
Maximum: 2.0 Nm (18 in-lb)
User terminals and stranded copper wire should have a minimum
temperature rating of 105°C. Ring terminals are recommended.
Wire Sizes and Insulation
Wire sizes for grounding (earthing), current, voltage, and contact
connections are dictated by the terminal blocks and expected load
currents. You can use the following table as a guide in selecting wire
sizes. The grounding conductor should be as short as possible and
sized equal to or greater than any other conductor connected to the
device unless otherwise required by local or national regulations.
Type Tests
These tests do not apply to contacts rated for 24 Vdc.
Electromagnetic Compatibility (EMC)
Emissions: IEC 60255-25:2000
Electromagnetic Compatibility Immunity
Conducted RF Immunity: IEC 60255-22-6:2001, 10 Vrms
IEC 61000-4-6:2008, 10 Vrms
Electrostatic Discharge
Immunity:
IEC 60255-22-2:2008
IEC 61000-4-2:2008
Levels 2, 4, 6, and 8 kV contact;
Levels 2, 4, 8, and 15 kV air
IEEE C37.90.3-2001
Levels 2, 4, and 8 kV contact;
Levels 4, 8, and 15 kV air
Fast Transient/Burst
Immunity:
IEC 60255-22-4:2008
4 kV at 5 kHz and 2 kV at 5 kHz (Comm
Ports)
IEC 61000-4-4:2011
4 kV at 5 kHz
Magnetic Field Immunity: IEC 61000-4-8:2009
1000 A/m for 3 s
100 A/m for 1 min
IEC 61000-4-9:2001
1000 A/m
Damped Oscillatory
Magnetic Field:
IEC 61000-4-10:2001
Severity Level: 100 A/m
Connection Type Min. Wire Size Max. Wire Size
Grounding (Earthing)
Connection
14 AWG (2.5 mm
2
)N/A
Current Connection 16 AWG (1.5 mm
2
) 10 AWG (5.3 mm
2
)
Potential (Voltage)
Connection
18 AWG (0.8 mm
2
) 14 AWG (2.5 mm
2
)
Contact I/O 18 AWG (0.8 mm
2
) 10 AWG (5.3 mm
2
)
Other Connection 18 AWG (0.8 mm
2
) 10 AWG (5.3 mm
2
)
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