Vertiv Liebert DCD, Руководство пользователя

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9 Water Flow Modulating Valve
The return temperature controller is a pre-assembled unit consisting of a 2-way control ball valve, an attached actuator with
spring return and an electronic control box with connected temperature sensor. The electrical connection is made with a
cold-unit connector. The volume flow of the medium is adjusted with the control ball valve via the actuator so that the desired
return temperature is set. The control action is such that the volume flow is increased if the measured temperature is above
the set-point.
The temperature set-point can be set on the unit display of the Vertiv™ Liebert® DCDactive or via the Modbus TCP/IP
interface. The current medium temperature and the position of the control ball valve can be called up on the Liebert®
DCDactive display or via Modbus TCP/IP. The operating status of the unit is indicated by a LED in the control box behind the
clear housing cover. As an option, the operating status can be picked up and forwarded to a signalling contact.
After correct connection and switching on the voltage, the Liebert® DCDactive automatically recognises the controller and
starts to control the medium temperature. If the bus connection between the Liebert® DCDactive and controller is
disconnected during operation, the controller moves the valve to the open position after a short time. Due to the actuator's
spring return, the open position is reliably approached even in the event of voltage loss or a cable break.
9.1 Connections
Connection Designation Description
X1 Mains Supply voltage connection (provided).
X2 Bus Connection for the Liebert® DCDactive.
X3 Signalling contact Connection for external evaluation of the signalling contact (optional).
Table 9.1
Figure 9.1 Side View with Designation of the Connections and Flow Direction Arrows
Figure 9.1 above shows the Side View with Designation of the Connections and Flow Direction Arrows of the Medium from
the Inlet (Union Nut) to the Outlet (External Thread).
9 Water Flow Modulating Valve
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Vertiv™ Liebert® DCDactive Fan Module User Manual