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MONITORING
AC4
USER MANUAL
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TABLE OF CONTENTS 1.0 INTRODUCTION 1.1 Methods of Viewing and Configuring the AC4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Data Logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.3 Available Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.4 Outside Enclosure Overview . . . . . . . . . .
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6.0 SILENCE ALARM & BACKUP LOG FILES (SERVICE TERMINAL INTERFACE) 6.1 Silence Alarm (Service Terminal Interface) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 6.2 Back Up Log Files (Service Terminal Interface only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 7.0 SYSTEM AND CONTROL OPTIONS 7.1 Login . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 7.2 S
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APPENDIX A-SERVICE TERMINAL INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49 A.1 Comparison of Functions: LCD and Service Terminal Interface. . . . . . . . . . . . . . . . . . . . . . 49 A.2 Connecting to the Service Terminal Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 A.2.1 Create a Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 A.2
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FIGURES Figure 1 AC4 enclosureexternal features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Figure 2 AC4 enclosureinternal features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Figure 3 Typical Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Figure 4 Example of typical sequence. . . . . .
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Introduction 1.0 INTRODUCTION The Liebert AC4 is ideal for coordinated control of systems with redundant equipment, such as multiple environmental units or pumps. When the AC4 controller detects an alarm in an operating device, the AC4 enables a standby device and controls the device in alarm as configured, either leaving that device operating or disabling it. The AC4 controller can also balance usage of devices by rotating units through Operating and Standby modes according to a user-defin
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Introduction 1.4 Outside Enclosure Overview The AC4s controller board comes in an enclosure that is 2-3/4" deep and has a built-in liquid crystal display (LCD) and a key lock, as shown in Figure 1. The enclosure is made of metal to accommodate secure conduit fittings and protect components against environmental debris. Figure 1 AC4 enclosureexternal features LCD for configuration and operation The enclosure has knockouts and access slots on top and Key lock bottom for cables and wires.
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Introduction 1.5 Typical Configuration Figure 3 shows an example of external devices connected to the AC4s controller board. There may be up to four devices connected to the four digital inputs and four digital outputs. Remote access is avail- able through the Service Terminal Interface. Figure 3 Typical Configuration DEVICES CONNECTED TO INPUTS & OUTPUTS Zone 1 Devices Device 1 Device 2 Liebert Liebert Challenger Challenger 3000 3000 Zone 2 Devices Device 3 Device 4 RS232 Liebert Liebert H
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Introduction 1.6 Controller Board Overview The AC4s controller board has connectors for four digital inputs and four digital outputs, as shown below. The board comes complete with light emitting diodes (LEDs) to display the status of connected devices, a serial communications port, a power connection and other features necessary to control your operation. D - Common Alarm A - Power C - Audible horn B - Audible connectors On/Off switch jumper horn E - Digital output P - 24VAC power stat
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Introduction Table 1 Controller board components (continued) Item Description For more information, see: One of four output jumpers. Each digital output has a jumper to set the fail-safe position of the output point when 3.2.3: Setting the Digital Output power fails. The OFF position makes the contact Normally I - Digital output Jumpers loss-of-power Open (factory default). The ON position makes the contact 7.6.4: Configure Output for Loss of Normally Closed. jumper Power (Fail-Safe) No
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Introduction 1.7 LED Indicators The AC4s controller board has LED indicators that show the status of inputs, outputs and the com- mon alarm OUTPUT1 DS56 Output LEDs OUTPUT2 DS54 OUTPUT3 DS63 OUTPUT4 DS61 OUTPUT5 DS60 OUTPUT6 DS62 OUTPUT7 DS55 OUTPUT8 DS57 CTRLLOCK DS59 SENLOCK DS58 CMN ALR DS53 DS52 MOP Status LEDs DS51 F PROG DS48 574 TX 574 RX DS47 485 RX DS78 485 TX DS79 DS69 INPUT1 Input LEDs DS71 INPUT2 INPUT3 DS72 INPUT4 DS70 INPUT5 DS67 INPUT6 DS66 INPUT7 DS65 INPUT8 DS64 Table 2 LED ind
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Introduction 1.8 Typical Sequence Figure 4 shows a typical sequence of how the AC4 functions after detecting a change in a monitored device. Many responses depend on configuration settings. This example shows what happens when a digital input changes stateassuming the input is defined as alarmableand when the condition returns to normal. Figure 4 Example of typical sequence RESPONSES TO AN ALARM RETURN-TO-NORMAL SEQUENCE ALARM CONDITION DETECTED RETURN TO NORMAL A device connected to the AC
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Installation 2.0 INSTALLATION 2.1 Installation Considerations The AC4 must be installed indoors and may be mounted on the surface of a wall or flush-mounted, depending on the users application, the location of equipment to be connected and the type of wall the unit will be mounted on. The AC4 should be mounted where it can be easily accessed. On-site personnel would access the unit through the LCD on its front cover or the service terminal connected to the RS232 port. In addition to the comm
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Installation 2.2 Surface-Mounting the AC4 NOTE Removing the conduit knockouts before mounting the AC4 on the wall will ease installation and prevent strain on the mounting hardware and wall. It is imperative to remove the knockouts if the unit is to be flush-mounted. After determining where to place the unit, check to ensure that you have all the hardware required to install the panel on the surface of a wall. Obtain the needed tools and material. Required tools Electric drill (if surface i
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Installation 2.3 Flush-Mounting the AC4 NOTE Removing the conduit knockouts before mounting the AC4 on the wall will ease installation and prevent strain on the mounting hardware and wall. It is imperative to remove the knockouts if the unit is to be flush-mounted. The rectangular access doors on the top and bottom of the AC4 must be reversed so they slide the opposite direction. Leaving the doors as shipped from the factory prevents them from being opened when the panel is flush mounted in
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Installation 2.4 Connect Power to the AC4 The AC4 requires 24VAC for proper operation. Liebert recommends using the optional Transformer Module manufactured by Liebert or another UL-approved class 2 power unit to obtain proper voltage. If the power unit is not a class 2 circuit, it must be protected with an IEC 5 x 20mm time lag 2A fuse. For information, consult your local dealer, Liebert representative or the Liebert Worldwide Support Group. WARNING ! Check that power is removed from wires
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Wiring and Connections 3.0 WIRING AND CONNECTIONS CAUTION ! Switch OFF electric power to the AC4 before installing any wiring to the unit or changing input or output connections. The Power On/Off switch is in the top left corner of the unit. 3.1 Wiring Specifications Input and output connections to the AC4 may be made in any orderit is not necessary, for example, to make all input connections before making any output connections. Use copper conductors only for all wiring. Table 4 Wiring spec
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Wiring and Connections 3.2 Connecting Digital Inputs and Outputs The digital inputs and outputs are found on the lower right side of the AC4s printed wiring assembly board. This section describes how to connect devices to the AC4s inputs and outputs. Each input is tied to an output with the same number: Input 1 is tied to Output 1 (default name: Device_1) Input 2 is tied to Output 2 (default name: Device_2) Input 3 is tied to Output 3 (default name: Device_3) Input 4 is tied to Output
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Wiring and Connections 3.2.3 Setting the Digital Output Jumpers Digital output jumpers (four) Each digital output has an associated jumper to define its operation when power is interrupted. This puts the AC4 in a fail-safe mode and ensures proper functioning when the board has no power. The AC4 comes from the factory with all digital output jumpers in the OFF position (normally open). The jumper setting for each digital output can be changed to ON (nor- mally closed). The settings are shown
