Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
307/346
If the signal is short circuit to ground it will have same effect as if the transmitter is disconnected. The po-
sition transmitters are supplied by 24 VDC from UniSAB III. If the power supply is short circuit to ground
it will both affect the power supply for the position transmitters and the power supply for the digital inputs.
Therefore, the compressor will stop immediately because of missing digital inputs.
9.1.5
Internal clock, Date - Time
The
Date
and
Time
function is provided with a battery back-up. If the battery is dead the internal clock
will not be running correctly after a power cut. If the power supply for UniSAB III fails, the clock will be re-
set to:
Hour:
19
Minute:
47
Second:
00
Day:
27
Month:
2
Year:
1970
The seconds will still be counting but for every 60 seconds the minute will switch from 47 to 48 and back
to 47 again. The clock can be adjusted to the actual time and it will then be running correctly until the
next power cut.
UniSAB III continues operation even when the battery is dead. However, date and time must be set cor-
rectly in order for the shutdowns to be stored with the correct time.
The internal clock can be checked in the menu
Setup/Timers/Date-Time
.
If the clock is not running correctly, replace the battery, see subsection
9.1.6
General instructions
Please note the following before performing any corrections inside the UniSAB III control cabinet:
UniSAB III may include live wires containing unknown voltage even though the supply voltage to Uni-
SAB III is disconnected.
Before troubleshooting or measurement, service personnel must be made aware of potential hazardous
voltage risk.
If measurement on electrical circuits are required for troubleshooting, service personnel must use appro-
priate methods and personal protective equipment.
When all connectors are mounted in their socket, and screws are tightened correctly, the controller com-
plies with IP2X. If one or more connectors are removed, socket pins may contain live voltage.
After troubleshooting or measurement, service personnel must bring the equipment back to safe state,
including removal of tools and correct mounting of connectors and wires.
Before beginning the troubleshooting, disconnect the main supply to the compressor motor to prevent it
from starting up inadvertently.
An interruption of voltage to UniSAB III will not cause any information loss, i.e. information can be dis-
played again once the supply voltage has been restored.
Summary of Contents for SABROE Unisab III Control
Page 1: ...UniSAB III control Version 1 10 8 Engineering manual EN...
Page 2: ......
Page 347: ......