Juniper ACX500 Hardware Manual page 173

a. The cable with very large resistance (indicating an open circuit) to chassis ground is the DC input
cable (–).
b. The cable with very low resistance (indicating a closed circuit) to chassis ground is the return cable
(+).
For +24V:
a. The cable with very low resistance (indicating a closed circuit) to chassis ground is the return cable
(–).
b. The cable with very large resistance (indicating an open circuit) to chassis ground is DC input
cable (+).
4. Remove the screws and flat washers from the terminals.
5. Secure each power cable lug to the terminal with the flat washers and screw (see
165). Apply between 8 lb-in. (0.9 Nm) and 9 lb-in. (1 Nm) of torque to each screw. Do not overtighten
the screw. (Use a number 2 Phillips screwdriver.)
a. Secure the positive DC source power cable lug to the return (+) terminal.
b. Secure the negative DC source power cable lug to the input (–) terminal.
CAUTION: Ensure that each power cable lug seats flush against the surface of the
terminal block as you are tightening the screws. Ensure that each screw is properly
threaded into the terminal. Applying installation torque to the screw when improperly
threaded might result in damage to the terminal.
CAUTION: The maximum torque rating of the terminal screws on the DC power
supply is 9 lb-in. (1 Nm). The terminal screws might be damaged if excessive torque is
applied. Use only a torque-controlled driver to tighten screws on the DC power supply
terminals. Use an appropriately sized driver, with a maximum torque capacity of 9 lb-in.
(1 Nm) or less. Ensure that the driver is undamaged and properly calibrated and that
you have been trained in its use. You might want to use a driver that is designed to
prevent overtorque when the preset torque level is achieved.
6. Replace the clear plastic cover over the terminals on the faceplate.
7. Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an
approved site ESD grounding point. See the instructions for your site.
8. Connect each DC power cable to the appropriate external DC power source.
Figure 58 on page
164