Vertiv Liebert DM Series User Manual

Vertiv | Liebert® DM | User Manual 85
Outdoor Fan Speed Controller (Only for 22 kW/27 kW)
6.2. Human-Machine Interface
The fan speed controller realizes the human-machine interface function through the indicators, RS232 serial communication
interface, buttons and digital tube.
• Indicators
There are three indicators on the fan speed controller board as shown in Figure 6-1 and refer Table 6-2 for the indicator
function.
Table 6-2 Indicator Function of Speed Controller Board
Terminal Description Color Status Function
D16
Power
indicator
Green
On CPU circuit has 5 V power supply.
O Fan speed controller board failure.
D22
Run
indicator
Green
On or O Fan speed controller board failure.
1 Hz flashing (slow flash) No alarm, normal operation.
5 Hz flashing (fast flash) There is an alarm or the compressor is stopped.
• RS232 serial communication port
The RS232 serial communication interface provides an interface to the monitoring computer using a factory-defined
protocol, mainly used for factory commissioning and maintenance.
• Button and digital tube
The buttons and the digital tube provide a human-machine interface for on-site maintenance, and can realize the functions
as described in Table 6-3. Refer Section 6.3 for the Human-Machine Interface operation instructions of buttons and digital
tube.
Table 6-3 Button and Digital Tube Function Description
No. Function Description
1
Real-time query of
collected data
Queryable data includes condensing pressure, ambient temperature, SCR
temperature, and output percentage.
2
Real-time query of
active alarm data
Queryable active alarm data includes input phase loss alarm, SCR over
temperature, Fan 1 over temperature, Fan 2 over temperature, pressure sensor
failure, EEPROM read failure, SCR temperature sensor failure and frequency
anomaly.
3
Real-time query of
historical alarm data
Can query the most recently saved 100 historical alarms.
4
Modify configuration
parameters in real time
The modifiable configuration data includes start-up pressure, minimum voltage,
pressure control range, maximum voltage, number of fans, pressure sensor type,
or restore the above parameters to default values.

Vertiv Liebert DM Series Specifications

General

Brand	Vertiv
Model	Liebert DM Series
Category	Air Conditioner
Language	English