COBHAM SAILOR 900 Ka, Руководство по установке

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98-146706-A 5-1
Chapter 5
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Power and startup
5
This chapter has the following sections:
• Power source
• Power cable
• Power up
5.1 Power source
The ACU is powered with DC power. There are different options for the power supply:
• The 24 VDC ship supply provides power for the ACU.
• An AC line provides power through an AC/DC power supply. The SAILOR 6080 AC/DC
Power Supply is recommended.
In order to protect against short circuit in the power cable/connector, the ship’s DC outlet
must be protected by a 30 A fuse or circuit breaker.
The modem is powered with AC power.
5.2 Power cable
The following sections provide information about the source impedance of the DC power
installation in the ship, how to measure it and power cable recommendations.
Source impedance
The maximum length of the power cable depends on the type of cable used and the source
impedance of the DC power installation in the ship. The maximum allowed source
impedance depends on the usage of the power range of the terminal DC input (Start up
voltage: 22 VDC guaranteed, operating range: 20 – 32 VDC; 23 A – 14 A).
See also Power cable recommendations on page 5-2.
To measure the ship’s source impedance
To measure the ship’s source impedance do as follows:
1. Select a power outlet from the ship’s 24 VDC system.
2. Measure the voltage without load (R.var disconnected).
3. Set the current to e.g. 1 A by adjusting R.var.
4. Measure the corresponding voltage change.
Note
Be aware of high start-up peak current: 35 A at 24 VDC, 5 ms.
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