- Emerson Remote Terminal Unit Instruction Manual

CI-ControlWave Express Installation & Operation / 2-25
2.3.7.2 Power Wiring
One Bulk DC supply can be connected to the ControlWave Express CPU/System Controller
Board. The Bulk DC supply (nominally +6Vdc, +12Vdc or +24Vdc) connected to TB1-3
(Power In +) and TB1-4 (GND -) is converted, regulated and filtered by the CPU/System
Controller Board to produce +3.3Vdc. This CPU/System Controller Bd. circuit is fused at
3.5A (F3). Depending on the version of the CPU/System Controller Board, the unit’s input
power operating range will vary as follows:
• Nominal +6Vdc input source operating range: (+5.4Vdc to +16.0Vdc)
• Nominal +12Vdc input source operating range: (+11.4Vdc to +16.0Vdc)
• Nominal +24Vdc input source operating range: (+21.8Vdc to +28.0Vdc)
An alternate power connection is available at connector TB2, intended for use if power is
not available through TB1. Bulk DC power would be connected to TB2-1 (Power Input) and
TB2-2 (GND).
Figure 2-16 - CPU/System Controller Board (TB1 & TB2) Power Wiring
Note: Solar Power In+ and Aux. Power Out+ not available on CPUs with Ethernet
2.3.7.3 ControlWave Express System Grounding
ControlWave Express Enclosures are not provided with a Ground Lug. Instead, the user
utilizes one or more mounting screws to secure a ground cable to the unit. A ground wire
(#4 AWG Max. wire size) must be run between the enclosure via one or more mounting
screws (see Figure 2-1) and a known good Earth Ground. The following considerations are
provided for the installation of ControlWave Express system grounds (see S1400CW):
• Earth Ground wire size should be #4 AWG. It is recommended that stranded copper wire
is used and that the length should be as short as possible.
• This ground wire should be clamped or brazed to the Ground Bed Conductor (that is
typically a stranded copper AWG 0000 cable installed vertically or horizontally).
• The wire end that is to be fastened to the ControlWave Express should be crimped to a
Terminal Ring/Lug and soldered. Note: Use a high wattage Soldering Iron.
• The ground wire should be run such that any routing bend in the cable has a minimum
radius of 12-inches below ground and 8-inches above ground.
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