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Megaplex/MAXcess DC Power Supply Connection – Circular 3-pin Connectors DC Power-Input Connectors DC-powered chassis are equipped with a circular 3-pin (male) power-input connector marked DC-IN (see Figure 1), located on the DC power supply module. Certain DC-powered chassis can also accept +60/+72 VDC ringer voltages (required by certain modules for voice or phantom feed applications). These have connectors with Pin 2 (marked +72V) assigned for this purpose. + 48V (or 24V) 0 CHASS GND +72V Ringer-Input Connector Figure 1. Standard DC-IN Connector AC-powered chassis that can accept DC ringer and feed voltages are also equipped with a circular 3-pin (male) DC connector marked RINGER-IN (see Figure 2). This connector is located on the AC power supply module and enables accepting the DC voltages required by certain modules for supporting voice or phantom feed applications. For standard DC connectors (no ringer voltages): Figure 2. DC-IN/RINGER-IN Connector that Accepts Ringer Voltages For DC connectors that accept ringer voltages: (+) 24/48 VDC (-) Input DC Power Supply Wire Voltage Polarity Supplied with the unit is a compatible (female) cable connector for attaching to your DC power supply cable. • If your power supply cable already has a compatible connector, just verify that the voltage polarity is as required. • If not, connect the wires of your power supply cable to the supplied cable connector according to the voltage polarity mapping shown in Figure 3. Note that the solder side of the connector is shown. 48V 1 3 (+) 24/48 VDC (-) Input Common Ground (0) 2 1 3 2 (-) Chassis (Frame) Ground ( ) 60/72 VDC (Ringer) Input (+) Figure 3. Voltage Polarity Mapping for Female Cable Connector (solder side) Caution: Prepare all connections to the cable connector before inserting it into the unit’s connector. See Figure 4 for assistance in assembling the connector. Warning: • Reversing the wire voltage polarity can cause damage to the unit! • Always connect a ground (earth) wire to the connector Chassis (frame) Ground terminal or alternatively, to the Grounding Screw provided on the PS module panel [mandatory for connectors with Pin 2 designated to accept +60/+72 VDC instead of connection to Chassis (frame) Ground]. Connecting the unit without a protective ground, or interruption of the grounding (for example, by using an extension power cord without a grounding conductor) can cause harm to the unit or to the equipment connected to it! Figure 4. Female Cable Connector Assembly SUP-209-10/01