Powerware Uninterruptible Power Supply SOLA 4000 - Manual (Page 33)

SOLA 4000 - Installation and Initial Start-Up
JUE 401265 33
1 Installation
1.7 Diesel - Generator Operation
During diesel generator operation, if the frequency of the diesel-
generator, with UPS and load connected, is unstable, it is advisable
to disconnect the synchronisation of the inverter. This is achieved
with a normally-open, voltage-free contact (which closes during
diesel-generator operation) and is connected to the connector M4
Pin 7 and Pin 8 as follows:
FIG. 1.7.1 Connection for Diesel Generator Operation (connector M4) - synchronisa-
tion disable.
Note1: For Hot-Standby or parallel systems, it is sufficient to feed
one contact into one unit only, however they may be connected in
parallel at M4 Pin7 and Pin 8 for all units
If it is necessary to reduce the current supplied by the diesel-
generator, then a second voltage-free contact (again normally
open) is required and must to be connected to the connector M8,
Pin 1 and Pin 2 on the rectifier electronic mother board (RBPHC16)
see FIG.1.7.2
FIG. 1.7.2 Connection for Diesel Generator Operation (connector M8) - second level
current limitation.
Note 1: The cable used in both cases must be twisted pair, with a
total shield.This shield must be grounded at one end (the cabinet
of theUPS may be used).
Note 2: The cable for current limitation must be connected to all units
for parallel or hot-standby units, using separate voltage-free
contacts.