Liebert UPS System - Manual (Page 82)

Chapter 6 Maintenance
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Emergent stop: If the user is in short distance, short connecting the “UCTRH” and
“UCTRL” can make the UPS shut down. Relay dry contacts should be used here.
Note:
The user should be careful when using this function. The power will be interrupted
completely once the emergency shutdown happens. When the user connects the
wires, the length of the wire should be no longer than 10m. Protection measures
should be done to the wire if the length of the wire is longer than 10m.
6.1.9 Temperature measuring
Two circuit branches of temperature can be measured.
J12 socket: Used to measure the battery temperature with the temperature sensor
TMP12Z made by Avansys. During installation, our service engineer has set the
function of “temperature compensation enabled”. Temperature compensation is
realized once the TMP12Z is connected.
J16 socket: The V-AD pin of this socket is used to measure the ambient
temperature of other points. Our service engineer can set the over temperature
alarm point through background host. The UPS will alarm when the temperature is
too high. Note: The 1.0~5.0V signal corresponds to 0~100°C.
6.2 Maintenance
6.2.1 Daily maintenance
There are few moving parts inside the UPS with the exception of the fans, thus few
components need to be maintained. The user should check according to the
following methods:
1. Daily checking
1）Check the control panel: All the LEDs should illuminate normally. The LCD
should display all the parameters normally without alarm.
2）Check whether there is over-temperature phenomena of the air blown out by
fan;
3）Check whether there is any abnormal noise;
4）Check whether the ventilation holes are obstructed;