Parallel Operation; Commissioning; System Configurations; Communication Between The Ups Blocks - Chloride 70-NET Bedienungsanleitung

CHLORIDE 70-NET 10 - 40KVA

PARALLEL OPERATION

8. PARALLEL OPERATION
Uninterruptible power supplies can be connected in parallel to increase power capacity or
for additional safety (redundancy). If the UPS units are equipped with the additional POB
(Parallel Operation Board) assembly, up to 8 of the same UPS blocks can be operated in
parallel for increased power capacity or redundancy. Your UPS units are equipped with this
option if the order number on the nameplate contains the letter "B" in the tenth position:
ENG
CH70 xx-xxBxx-xxxx.
This feature can also be added at a later time and is, therefore, available as an option.
A multiple-block system is automatically regulated and controlled via the controller of the
individual UPS blocks. The available electronic bypasses in the individual blocks work to-
gether just as all the corresponding inverters and divide the load current between them. All
necessary communication for parallel operation is carried out via a shielded 25 conductor
cable. Each UPS block is shipped with a 5m long communication cable which is sufficient
for most installation requirements.
When planning the system and during installation, power cables having the same length are
to be used between the input distribution and the input terminals for the bypass and rectifier
(U1, V1, W1, N), as well as from the UPS outputs (U3, V3, W3, N) to the parallel connection
point on the load side. Differences of 20% are allowed for power cable lengths of up to
20 m. For larger distances, cable lengths may not vary by more than 10%.

8.1. COMMISSIONING

Commissioning of multiple-block systems must be carried out by appropriately trained tech-
nicians.

8.2. SYSTEM CONFIGURATIONS

The fig. 25 on page 48 illustrates the schematic diagram of a 4-block system with common
battery and Service Bypass Switch (SBS). The SBS illustrated can be used in
parallel systems where units aere of standard, 400V type. If T_Version units are used (see
"Special versions" on page 56) a correctly configured transformer must be installed at the
input of the SBS.
UPS blocks have been designed for use with separate batteries (fig. 25 on page 48).
Where a common battery is used, the battery manager does not carry out autonomy time
and capacity calculations.

8.3. COMMUNICATION BETWEEN THE UPS BLOCKS

UPS units exchange information between each other via the connector cable (25 pin con-
nector) shipped with each unit. The fig. 26 on page 49 displays the loop circuit which is elec-
tronically monitored. The communication cables are shielded and must be run separately
and away from all power cables.

8.4. OPERATION

With reference to "Normal and safe operation" on page 27 once the inverters of each UPS
are Online, the inverters of the UPS units synchronise and take over the load. The UPS in
now in Online operation. Switching from Online to Bypass operation is carried with refer-
ence to "Normal and safe operation" on page 27. The UPS are switched, one after the oth-
er, to the Maintenance Bypass position. Once the last UPS is switched into the
Maintenance Bypass position, all inverters switch off and all bypasses switch on. The ex-
ternal service bypass may only be connected in bypass operation (fig. 25 on page 48).
User Handbook - 10H52163PAMC rev.9 - 06/2008 Page 47