MGE UPS Systems EPS 6000 - Manual (Page 59)

To shut down an individual UPS module, press the “inverter
off” pushbutton on the module front panel for 3 seconds. To
restart, press the “inverter on” pushbutton. Note that the transfer will occur only if the inverter is
synchronized to the bypass; otherwise, a forced transfer is needed (see Section 2.4.6).
To isolate an individual UPS module for maintenance
(allowing the remaining UPS modules to maintain the
attached load), follow this procedure (starting with all UPS
modules operating normally, supplying the attached load):
1. Stop the inverter by pressing the “inverter off” pushbutton on the UPS module front
panel for 3 seconds. The audible alarm will sound; silence the alarm by pressing
the audible alarm reset pushbutton on the hidden panel (see Section 2.2.3). If the
transfer conditions are not satisfied (bypass out of tolerance or other reason), a
forced transfer is required; refer to Section 2.4.6, Forced Transfers.
2.4.5.1 Isolation of
an Individual
UPS Module
2.4.5 Isolation for
Maintenance
W h e n o n e U P S m o d u l e i n a s h a r e d s y s t e m i s s h u t
d ow n , i t m ay c a u s e t h e r e m a i n i n g m o d u l e s t o e n t e r
a n ov e r l o a d o r c u r r e n t - l i m i t i n g c o n d i t i o n , i f t h ey
a r e u n a bl e t o f u l ly s u p p o r t t h e a t t a ch e d l o a d . T h e
r e m a i n i n g m o d u l e s m ay s h u t d ow n a f t e r a c e r t a i n
t i m e o r i m m e d i a t e ly ( d e p e n d i n g o n t h e l o a d l ev e l ) ,
a n d t h e l o a d m ay b e t r a n s fe r r e d t o t h e by p a s s AC
i n p u t s o u rc e .
IMPORTANT
2 — 33 Operation
User’s guide