18
1
Install power cables.
Insert the power cables into the DC connector based on the pin assignment. Y ou do not need to prepare the power cables on site if they were
prepared bef ore deliv ery .
After fastening a cable, check whether the cable core is exposed outside the power cable connector terminal. If the
cable core is exposed, re-route the cable into the power cable connector. If the cable core is still exposed after you re -
route the cable, peel the cable again.
NEG2(-)
INPUT
RTN2(+)
RTN1(+)
NEG1(-)
ON
OFF
20A
32A
32A
20A
ON
OFF
1
2
3
4
1
2
3
4
20A
32A
32A
20A
OUTPUT
OUTPUT
A
B
Check the fuse capacity of the external power supply.
Check the voltage and polarity of the external power supply.
Recommended Fuse Capacity
RTN 905 1A/2A/1C/1E/2F: 10 A
RTN 905 2E: 16A
Rated Voltage of Input
Power
Allowable Voltage Range
–48 V ( DC )
–38.4 V to –57.6 V ( DC )
–60 V ( DC )
–48 V to –72 V ( DC )
RTN(+)
NEG(-)
The recommended fuse capacity is sufficient even at the
maximum power consumption level. Users can calculate
fuse capacity by applying this formula: Fuse capacity ≥
(Total power consumption x 1.5)/(Rated voltage of input
power x 87.5%).
Installing IDU Cables
If the AC power box (ETP 4830) is used, the IDU needs to use the BGND power cable and -48 V power cable that are
delivered with the AC power box. For details on the AC power box and its cables, see the IDU hardware description.
1
0.22
±
0.03 N·M
M2
1
2
3
See appendix "Connecting Cables to a Power Cable Connector."
WARNING
The IDU does not support AC power. Do not connect
the IDU to an AC power supply. Otherwise, equipment
may be damaged and you may be injured.
