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Connecting Earth Ground

Grounding of the chassis is required prior to powering the unit. Grounding is required to reduce or prevent the risk of shock hazards, equipment damage, and the potential of data corruption.

A grounding lug, M4 screws, and washers are provided with the package contents, however, the grounding wire is not included. For convenience, there are two locations on the case in which the grounding lug may be fixed.

The following instructions are for grounding the equipment:

CAUTION: This equipment must be grounded. Do not defeat the ground conductor or operate the equipment without correctly grounding the equipment. If there is any uncertainty about the integrity of the equipment's grounding, please contact your local electrical inspection authority or a certified electrician.

1

Before grounding the equipment, ensure that the rack is properly grounded and in compliance with local regulatory guidelines. Ensure that there is nothing that can obstruct the connection for grounding and remove any paint or materials that may prevent good grounding contact.

2

Strip 0.5” +/-0.02” (12.7mm +/-0.5mm) of insulation from a size #6 AWG green and yellow grounding wire of adequate length to reach the rack or other grounding terminal block. Note that this wire is not provided with the installation kit.

3

Insert the exposed grounding wire all the way into the barrel of the grounding lug that is provided in the installation kit.

4

Using a crimping tool or a crimping tool with dies sized for a #6 AWG Grounding Lug, deform the barrel of the lug such that the stripped wire is contacted, compressed and secured in place.

Typical Crimping of 2-Hole Grounding Lug

5

After crimping, firmly grasp the 2-Hole Grounding Lug and pull on the wire to ensure adequate crimp and retention of the wire into the connector.

NOTE: If the stripped wire dislodges from the Grounding Lug, a new #6 AWG Grounding Lug will be required. It is suggested to source Panduit P/N LCDX6-10A-L if additional grounding logs are required. Revise crimping process as necessary to adequately deform the barrel of the grounding lug to securely clamp the stripped wire and provide low resistance electrical contact.

6

Locate the designated location for securing the grounding lug on the right side of the Onyx FHM. This area is free of paint and has threaded holes sized for the included M4, 8mm Long Screws.

7

Insert 2 pcs. of the M4, 8mm Long screws through 2 pcs. of the M4 Star Washers that are provided with the Onyx FHM.

8

Insert screws through the 2 holes of the crimped Grounding Lug and install additional 2 pcs. (1 Each) of M4 Star Washers provided with the Onyx FHM onto the M4 screws behind the crimped Grounding Lug, as shown in Figure: Hardware Arrangement for Grounding Lug.

Hardware Arrangement for Grounding Lug

9

Thread the assembled 2 pcs. of the M4, 8mm Long Screws, 4pcs. of the M4 Lock Washers and Grounding Lug into the threaded holes on the right side of the Onyx FHM and secure as shown in Figure: Grounding Lug Installation onto the Onyx FHM.

NOTE: It is easiest to install the crimped Grounding Lug prior to installing the Rack Mounting Bracket if the unit is to be installed into a rack or chassis. The Mounting Bracket is shown in Figure: Grounding Lug Installation onto the Onyx FHM for reference only.

Grounding Lug Installation onto the Onyx FHM

10

Torque the M4, 8mm Long Screws fastening the Grounding Lug to the Onyx FHM to 20 in-lbs. (2.3 Nm) +/- 10% using a #2 Phillips Bit and Torque Driver.

Grounding Lug Installation Details

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