50 ControlEdge HC900 Process & Safety Controller User and Installation Manual Revision 10
May 2019
4. Pre-Installation Planning
4.1. Overview
Methodical pre-planning of an installation will preclude false starts and errors that can cause costly
hardware re-configuration and/or poor system performance. Factors to consider in your pre-installation
planning include:
C75 CPU requires 900P01 power supplies, C70R CPU requires 900P02 power supplies.
I/O Rack can use AC Power Supply 900P01 (see page 50) or +24DC Power Supply 900P24
(see page 52).
Limit of ten 4 channel, (five 8 channel or two 16 channel if powered from backplane) Analog
Output modules can be installed per rack. Limit of 4 PFQ modules.
Power Supply rack space (if using redundant I/O power) (see page 53)
Rack orientation and mounting (see page 52)
Remote Terminal Panels (see page 55)
Environmental conditions (see page 55)
Heat rise de-rating (see page 55)
Cabling/wiring distance planning (see page 58)
Electrical considerations: controller grounding, CE conformity, grouping wires, master control
relay for emergency shutdown (see page 59)
System monitor function blocks (see page 66)
4.2. AC Power Supply Selection for racks with I/O
To determine which I/O rack AC power supply to use (P01 or P02), calculate power requirements below.
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