14
MNL107-900-000D
SECTION 3
OPERATION
!
WARNING
This equipment involves the use of voltages and currents that can be hazardous under
normal operating conditions. Only qualified personnel should be allowed to operate or
service it. All covers and guards must always be in place during operation. A protective
earth connection must be used.
3.1 CONTROLS
AND
INDICATORS (refer to fig 2-1.)
1.
INPUT POWER BREAKER: Dual circuit breaker interrupts AC and DC input power in the
event of and internal fault. If breaker trips, unit will enter the line By-pass mode which will
route the input AC line to the output terminals.
(NOTE: 48 VDC units have separate AC
& DC breakers.)
2.
BY-PASS FUSE: protects the AC line and unit wiring in the event of an output overload
while in bypass mode. Fuse rating is 15 amps / 250 VAC.
Replace fuse with same type
and
rating
only.
3.
STATUS INDICATING LEDS: operation as follows:
a.) DC PRESENT: Indicates green when DC input is within operating range of +/- 20%
b.) SYSTEM OK: indicates green when back-up inverter and internal supplies are
functional.
c.) AC OUTPUT: indicates green when output is supplied by
A
on-line
@
inverter
d.) AC PRESENT: indicates green when AC line input is within operating range.
4.
ALARM CONTACTS: “Dry” type contacts will open in conjunction with the front panel
status indicators. If the status indicator turns off, the appropriate alarm contacts will open.
See section on alarm contacts in this manual for further information.
5.
AC INPUT TERMINAL BLOCK: facilitates connection of line input (use of # 8 ring lug
recommended) connect as marked. “HI” terminal to line “LO” terminal to neutral and
“GND” terminal to safety earth (protective earth as defined by IEC-61010-1).
6.
DC IN TERMINAL BLOCK: facilitates connection of DC input. Note: 125 VDC inputs are
not polarity sensitive and may have +/- wires reversed.
! CAUTION
48 volt units r/- polarity to be connected as indicated. Failure to do so will trip the
input breaker and may cause damage to the equipment.
7.
OUTPUT CONNECTIONS: typically supplied as NEMA 15R type connectors. Customer
specified connectors or terminal blocks may also be provided as an option. Check model
and part number on units rating label. Special units will have a unique four digit suffix to
indicate any special configuration.
