1. Utilization
The switch-mode power supply rack units DPP4004/4012 are meant for the incorporation into 19" rack shelf systems and serve to supply PA-system installations with the operational voltage of 24 V.
The switch-mode power supplies DPP4004/4012 can be operated as single units, together with the PA-system PROMATRIX, or battery-powered, as well as together with the DYNACORD DEM-system.
Caution: It is not permissible to expose this appliance to dripping or splashing water.
2. First Operation
The switch-mode power supply rack units DPP4004/4012 are to be operated on the 230 VAC mains supply. Internally switching the appliances to different voltages is possible (please refer to the paragraph
4:adjusting the mains voltage). Connecting the power supplies is only licit on a accurately installed 3-pole mains outlet.
The mains outlet connector (6) is meant for convenient connection within rack shelf systems. It is possible to connect other devices to the mains output (6), using a common mains cord. A maximum power consumption of 1 A should not be exceeded.
3. Functions of the DPP4004/4012
The power supply rack units DPP 4004 and 4012 were designed to supply PA-systems with or without emergency battery power supply with the necessary power. They can also be used to remotely control (on/off) several functions. Managing the switching between mains and battery supply is performed automatically.
Using the mains switch (1) (main switch function) on the front of the appliance, it is possible to turn the system power off completely. To prevent inadvertent erroneous switching, a cover lid can be installed with the switch being ion its ON-position.
When the switch is set to OFF, all outputs are without current and the MAINS (2) and BATTERY (3) LEDs are not lit. With the mains switch being engaged, the internal 24 V power supply is provided with mains voltage. At the same time, the mains output connector on the rear of the appliance gets mains supply (max. 1 A), allowing the connection of external low-level power consumers (tape decks, etc.). With the mains switch being engaged and when the appliance is correctly connected and the mains is present, the MAINS-LED will light. Correspondingly, the BATTERY-LED is lit when a battery power source providing 24 V is correctly connected to the BATTERY IN connectors – (12) and (13) – and with the mains switch being engaged.
The output voltage of the internal power supply is present at the DIRECT OUT (9) connector. With the DPP 4004 this connector’s maximum power handling capacity is 4 A; the DPP 4012 provides 12 A. The output offers internal short-circuit protection and it can be operated without load. It also serves to use the appliance as plain power supply – without battery supply and without remote control.
The output SWITCHED OUT (16) is meant for the connection of the DPM 4000 or other external devices that need non-interrupted emergency power supply. With the DPP 4004 this connector’s maximum power handling capacity is 4 A; the DPP 4012 provides 12 A. The output offers internal short-circuit protection and it can be operated without load. Usually, this output is connected to the internal switch-mode power supply, so that the connected load is supplied with the needed voltage. In case of temporarily insufficient mains supply, power failure, malfunctioning of the switch-mode power supply or thermal overload of the DPP 40xx, the SWITCHED OUT (16) is switched to battery supply (when present) within fractions of a second, providing gapless power supply to the connected devices. When the mains is present again or after solving the problem that caused the malfunction, the appliance automatically returns with a delay of 600 ms to mains operation. If there is no battery present during the occurrence of a mains complication, the DPP 40xx behave as if the front mains switch has been switched off; except for the fact that the MAINS LED is still lit.
The output MODULES OUT (14) is meant for the connection of devices (relay-fields, alarm-devices, voice reproduction, etc.) that can be switched off during a power outage – during which time the PA-system should operate in the stand-by mode. Switching off unnecessary devices during the occurrence of a power failure is preferable, otherwise the battery is unnecessarily strained. The output employs a “softstart” function that controls the initial current inrush, preventing the main supply from interference by possible
