Description
The 1756-PH75 is a high-efficiency, high-voltage direct current (DC) chassis power supply module designed for the Allen-Bradley ControlLogix 1756 platform. This side-mount module serves as the central electrical power source for the backplane, converting facility-level high-voltage DC into regulated multi-rail logic voltages required for processors, communication modules, and I/O.
Features
- Designed for 125 VDC nominal input power systems.
- Provides four regulated output rails: 24 VDC, 5.1 VDC, 3.3 VDC, and 1.2 VDC.
- Supports 75 Watts of total backplane output power.
- Features ride-through capability of up to 50 ms to prevent system resets during brief input power dips.
- Reinforced insulation rated for 250 Volts continuous isolation.
- Mounts directly to the left side of standard 1756 Series B chassis.
- Passive cooling design; no internal fans required.
Applications
This power supply is engineered for intensive industrial environments where high-voltage DC bus distribution is standard, including electrical substations, mass transit rail infrastructure, marine power generation, and automated manufacturing facilities.
Technical Specifications
| Model |
1756-PH75 |
| Input Voltage Range |
90 to 143 VDC |
| Max Input Power |
95 Watts |
| Max Backplane Output |
75 Watts (0 to 60 deg C) |
| Output Current (24V / 5.1V / 3.3V / 1.2V) |
2.8A / 13.0A / 4.0A / 1.5A |
| Operating Temperature |
0 to 60 deg C |
| Storage Temperature |
-40 to 85 deg C |
| Vibration Resistance |
2 g @ 10 to 500 Hz |
| Weight |
1.33 kg |
Installation Guidelines
- Ensure the ControlLogix chassis is powered down before installing or removing the power supply module.
- The module must be installed on the left side of the 1756 chassis.
- Use 2.5 mm2 (approx. 14 AWG) solid or stranded copper wire for input connections.
- Tighten terminal block screws to 0.8 N·m (7 lb·in) to ensure secure contact and vibration resistance.
- Maintain adequate clearance around the module to allow for convective airflow; do not obstruct the open-style chassis.
- Ensure the installation environment meets the specified 5 to 95 percent non-condensing humidity requirements.
FAQ
Is this module compatible with all ControlLogix chassis?
The 1756-PH75 is designed for use with 1756 Series B backplanes, including the 1756-A4, A7, A10, A13, and A17 models.
Does this module require external cooling?
No, the module utilizes an open-style architecture that relies on ambient convective airflow for thermal management.
