MNL940-677-000
REV - B
3/20/2017
7
2.2
Wiring (continued)
The recommended wire size for each model is listed below in table 2-1. These sizes are based on
a maximum wire length of 10 to 15 feet. Longer wires should be increased in diameter.
MODEL #
DC INPUT WIRING
AC INPUT \ OUTPUT WIRING
INV-1200-48-XX
# 8 AWG (45 A)
# 14 AWG (10 A max)
INV-1200-125-XX
# 12 AWG (15 A typ.)
# 14 AWG (10 A max)
INV-1200-250-XX
#14 AWG (7.5 A typ.)
# 14 AWG (10 A max)
TABLE 2-1
2.3
OPTIONAL ALARM CONTACTS
Units supplied with either the A1 or D1 bypass options also provide signal contacts that can be
used to set alarms or trigger other system related responses to operating conditions.
The alarm contact option provides the user with a convenient means of monitoring the status of
DC input, AC input, and INVERTER (inverter AC output). Each function provides one set of “dry”
“form C” contacts which accommodates any logic required. The internal relays will change state if
any of the three voltages are outside of limits required to provide proper operation. The range that
this occurs is about +/-15% of nominal for the model in use. The contact rating of the alarm
functions are 0.5 amp @ 125 VAC maximum (32VDC max.). The figure 2-3 below illustrates the
alarm internal wiring.
FIGURE 2-3 INTERNAL ALARM WIRING
To prevent possible EMI (electro-magnetic interference), alarm wiring should be accomplished
with twisted pairs. Shielding is also recommended. This will prevent interference from entering or
leaving the unit. All alarm connections should be made with #6 inside diameter ring lugs. A rear
panel mounted, 9 position, terminal block is provided for connection to the alarm signal relays.
See section three of this manual for further information. Note that the signal relays operate in
parallel with the front panel indicator LEDs.
