ENA2100-AC Amplifier - Mounting and Installation

This article describes the mounting and installation of the ENA2100-AC amplifier.

Installation

Overview - Front

1	Mounting Flanges	The mounting flanges are used to mount the unit in 19” equipment racks with 2HU in double configuration.
2	Ventilation Inlets	The ventilation inlets should be kept free of obstacles and dust. Fans control the airflow based on internal temperature.
3	Status Indicators	The status indicators are used to display the status of important parameters like power supply and faults. There is also a VU indicator for channel 1 and channel 2.

Overview - Back

1	Ethernet Ports	Redundant Ethernet connections for audio and control data.
2	Audio Input	Line-in audio input for external audio sources. Nominal input level: 100 mVRMS – 1 VRMS
3	Control Inputs	2 configurable control inputs. Each input is activated by closing the loop between the two terminals.
4	Control Outputs	2 configurable control outputs. Each is made of a 24VDC signal. The 24VDC can source max 200mA and has overcurrent protection.
5	Fault Relay Output	A switching relay (NO, NC & COM) kept in the active position between COM and NO as long as no faults are present in the device.
6	Speaker Outputs	100 and 70 volts outputs per channel.
7	Factory Reset Button	To reset the amplifier to factory default settings: Insert a straightened paper clip or similar device into the hole to press the reset button and hold for 7 to 8 seconds while powering up the amplifier.
8	AC Power Switch	Power switch for AC power.
9	AC Power Inlet	AC power inlet for 110 to 230 VAC. The power inlet has a V-Lock mechanism for a secure connection.
10	Ground Connection	Ground connection for grounding of the unit. This is connected in parallel with the ground connection in the AC power inlet.

Placement and Stacking

The amplifier is designed to deliver full power at ambient temperatures up to 55 °C. As long as the equipment rack is well ventilated, amplifiers can be stacked with no extra space between them. It is however recommended to add 1 HU between every group of 4 amplifiers.

Mounting

There are two kits available for mounting of the amplifier:

• Kit for mounting a single ENA2100-AC amplifier in a 19-inch rack.
  • ENA2100-AC single mounting, item Number: 1023532100

Single Amplifier kit

• Kit for mounting two ENA2100-AC amplifiers together in a 19-inch rack.
  • ENA2100-AC double mounting, item Number: 1023532110

Double Amplifier kit

Power Supply

The Amplifier is connected to the equipment rack’s mains power. AC power inlet for 110 to 230 VAC. The power inlet has a V-Lock mechanism for a secure connection.

Ethernet Connections

The Amplifier is connected to the network using one of the two Ethernet ports.

Fault Relay

The Amplifier’s fault relay will trigger whenever a fault occurs in the amplifier. This relay is actively kept closed by the Amplifier so it will trigger even if the entire amplifier loses power. The connection to external equipment should be made according to the external equipment’s requirements. When no faults are present in the amplifier, an electrical connection is established between the COM and NO terminals of the fault relay. When a fault is detected, or the amplifier loses power, this connection is removed and a connection between COM and NC is established.

Control Inputs

There are 2 inputs available. The inputs can be used in a convensional way, or they can be monitorted.

• Conventional inputs have two states:
  • Contact is Open
  • Contact is Closed

Monitoring is done by connecting two resistors as close as possible to the external switch/relay, one in series and one in parallel. The resistor connected in series with the external switch/relay shall have a value of 1 kΩ, while the resistor connected in parallel shall be 2.2 kΩ.

• Monitored Inputs have four states:
  • Contact is Open
  • Contact is Closed
  • Short circuit (error)
  • Open circuit (error)

Monitoring of inputs must be enabled in the web interface: Amplifier Settings > RCO/RCI Config > RCIs section.

Control Outputs

There are 2 outputs providing 24V DC signal.

• Rating: 24 VDC, ±10%, 200 mA

Audio Input

There is one Line Input which can be used for background music or external alarms. See ENA amplifier in Bypass Mode

• Nominal input level: 100 mVRMS – 1 VRMS

Loudspeaker Connections

The Amplifier has two options for loudspeaker connections: 70 volts or 100 volts.

Connected loudspeaker load should be less than the rated output power of the unit. Good practice is to maintain a minimum of 10%, or preferably 20% in reserve to accommodate future additional loudspeakers and avoid too much strain on the amplifier itself.