Liebert Vertiv GXT5 - 2.8. Installing a Parallel System; 3.3. Transferring to Battery Mode; 3.4. Transferring from Normal to Bypass Mode; 3.5. Transferring from Bypass to Normal Mode

Installation42
2.7
.6. Connecting Liebert IRM sensors
The GXT5 supports up to 40 Liebert® IRM sensors (The sensor address must be 1~40). Available sensor
types include temperature, and temperature & humidity sensors.
The highest sensor data can be shown in GXT5/battery status page. And the highest temperature from the
sensors can be used for battery temperature compensation.
To install an Liebert IRM sensor:
1. Connect the sensor and the RS-485 port using network cable.
2. Place the sensor into the groove of the EBC, as shown in Figure 2-2.
2.8. Installing a Parallel System
10-kVA, 16-kVA, and 20-kVA models may be congured in a parallel system. The UPS parallel system provides
support to the following options:
• 2 active systems
• 2 active systems plus 1 redundant system
• 1 active system plus 1 redundant system
All electrical requirements, including external-distribution panel and branch circuit breaker, apply to each UPS
in a parallel system, which are then connected in ring conguration for redundancy and additional reliability.
System load information can be accessed via any controller/display in the system.
The following are requirements for the parallel-connected system:
• Each UPS must have the same capacity and must be connected to the same mains/utility source.
•
If a residual-current detector (RCD) is required, it must be correctly-set and installed before the same
neutr
al-line input terminal. See safety and regulatory information, available at https://www.vertiv.com/
ComplianceRegulatoryInfo.
•
The output of each UPS must be connected to the same output bus.
• The parameter conguration for each UPS must be identical.
• Because the parallel system is not tted with auxiliary-contact detection devices for the output circuit
breaker or the maintenance-bypass circuit breaker of each UPS, You must strictly-follow the procedures
for transferring between operating modes when removing a single UPS from the parallel system before
maintenance and when adding a single UPS after maintenance. Failure to observe the procedures may aect
the reliability of the load power supply.
Figure 2-14 on the next page shows an example of the 10-kVA model connected as a 2 + 1 parallel system
connected in a ring conguration.