EPSILON CLOCK MODEL EC20S Spectracom
21 User’s Manual
7. POWER SUPPLY INTERFACE
7.1 AC POWER SUPPLY INPUT
The AC power supply shall be considered as the main power supply for the EC20S. It shall meet the
following features:
- Use standard power cord type CEE7 VII / IEC320 C13.
- Nominal AC input voltage : 100 to 240 Volts AC / 50 to 60 Hz
- On switch : 2 fuses TT 1A L 250 V type - (example - see 18.3 for detail)
7.2 DC POWER SUPPLY INPUT
The DC power supply shall be considered as a backup power supply for the EC20S. It shall meet the
following features:
- For DC power cord, use conductor type : AWG24 (0.22mm
2
).
- Nominal DC input voltage conditions : 24 to 48 Volts DC
- Maximum Total Power consumption : < 55 W
- Protection against polarity reversal
- -48V and 0V DC input wires are not ground referenced
- Protected by a PolySwitch fuse (automatically rearmed)
- Threshold level for the presence detection : 20 to 25 Volts DC
NOTA: When there is no DC power supply, it is strongly recommended to disable the alarms
associated with this power supply device (while the factory setting enables this alarm). See 13.9.
For detailed information about this supply interface, refer to the appendix 19.3.
7.3 REDUNDANCY SYSTEM OF THE POWER SUPPLY
When a DC power supply is present, the EC20S will automatically switch from the AC power supply to
the DC power supply in case of failure of the AC power supply.
When the AC power supply is present, the DC power supply is internally disconnected.
7.4 POWER SUPPLIES MONITORING
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