Vertiv | Liebert® DM | User Manual 83
Outdoor Fan Speed Controller (Only for 22 kW/27 kW)
Chapter 6: Outdoor Fan Speed Controller (Only for 22 kW/27 kW)
This chapter briefly introduces the use of the fan speed controller from an end-user perspective. The detail includes the
definition of the cabling terminals of the fan speed controller and the introduction of the human-machine interface &
operation instructions. The content of this chapter helps in the maintenance of the unit.
• The number of fan configured in the unit must be same as the actual number of fans. Otherwise, false
alarms may occur. For details, refer Section 6.3.2.
• Only qualified service and maintenance personnel can perform system operation and maintenance.
6.1. Cabling of the Terminals
The cabling terminals are located on the fan speed controller board, refer Figure 3-2. The distribution is shown in Figure 6-1,
and refer Table 6-1 for details. For the specific wiring method of the wiring terminal, please refer to Appendix 2 Outdoor unit
circuit diagram.
Figure 6-1 Distribution of Terminals
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