Huawei OptiX OSN 2500 Quick Installation Manual page 32

d
Installing and Routing the Power Cables -- Testing Resistance Between Power Cable Poles
Ensure that the switch of the external power supply device is turned to the 'OFF' side.
If a power monitoring device is installed to the power supply device, disconnect the power supply device
and the power monitoring device before the test. Otherwise, the test result may be not correct.
•N1PDU
Power sockets 1-4
(left)
Power switches SW1-SW4 (left) PGND bolt
•DPD100-2-8 PDU
Turn the subrack power switch to the 'OFF' side.
The switch is on the DC PDU, which is on the top of the cabinet.
Use the multimeter to test the resistance between the NEG(-), RTN(+) and PGND. The value should be ∞.
Turn the subrack power switch to the 'ON' side. The switch is on the DC PDU, which is on the top of the cabinet.
Use the multimeter to test the resistance between the the NEG(-), RTN(+) and PGND. The value should be more
than 20 kilohms.
Turn the switches of all the subracks to the 'OFF' side.
If the test result shows that the resistance is less than 20 ohms, it indicates that a short circuit occurs between
the working power and the working ground. In this case, rectify the fault and perform step 4 again.
RTN2(+)
RTN1(+)
Power input area (A)
A-NEG1-4 (-)
A-RTN1(+)
Power output area (A)
NEG1(-)
NEG2(-)
Power switches SW1-SW4 (right)
Power input area (B)
B-NEG1-4 (-)
B-RTN1(+)
Power output area (B)
29
Power sockets 1-4
(right)
DPD100-2-8 PDU Ground Point