11
SENS IQ Technical Manual
Service hotline: 1.800.742.2326
1.303.678.7500
The battery charger is designed for permanent connection to the battery and DC load circuit, as
shown in
FIG 1
. Wiring used must be sized appropriately for the charger output current and must be
selected to meet any applicable local codes (see
TABLE 1
for circuit breaker ratings and
TABLE 3
for wire gauges). Connection is made to the load side of the output circuit breaker via conduit
knockout openings on the lower left side of the charger enclosure. Proper polarity for connection to
the circuit breaker is labeled on the inside of the charger near the output circuit breaker.
Output (DC
battery) wiring must be kept at least 1/4" (6.3mm) away from all alarm and data interface wiring,
and from other uninsulated electrical parts not connected to the output conductor.
The battery may be disconnected (for test or replacement purposes) while leaving the charger
powered on without interrupting the load. With battery disconnected, on charger with 2% filter, the
maximum transient voltage deviation is 5% of initial voltage when subjected to load current changes
between 20% to 100% and 100% to 20% of full rated load current. Recovery to within 1% of steady
state voltage is within 200 milliseconds. Transient response in units with battery eliminator output
filter is slower.
WARNING:
OBSERVE PROPER POLARITY WHEN CONNECTING THE
BATTERY CIRCUIT TO THE CHARGER. FAILURE TO DO SO
COULD RESULT IN EXPLOSION AND DAMAGE TO THE
BATTERY CHARGER. SHOULD THE BATTERY CONNECTIONS
BE REVERSED, A BEEPING TONE WILL BE HEARD WHEN AC
POWER IS APPLIED. IF THIS TONE IS HEARD, RECHECK
BATTERY AND SENSE LEAD CONNECTIONS TO OUTPUT
BREAKER FOR PROPER POLARITY BEFORE CLOSING THE DC
CIRCUIT BREAKER OR OPERATING THE CHARGER.
NOTE:
If required for your installation, either the positive or the negative charger
output may be connected to earth ground. If this is done, the ground fault alarm
must be disabled to prevent a false alarm (see Section 8.5.2 to configure the
ground fault alarm).
CAUTION:
Small sense leads are connected to the load (output) side of the DC output circuit
breaker. These must remain connected with the proper polarity after installation of the
output power DC wiring or the charger will not function properly.
6.2
DC Output Connections
Rated Charger Output
Wire Gauge
Volts
Current
Min
Max
12V - 48V
50A
# 14 Cu or Al
# 2 Cu or Al
120V & 240V
16A
# 14 Cu, #12 Al
# 4 Cu or Al
25A
# 14 Cu, #12 Al
# 1/0 Cu or Al
Table 3: DC Output Wire Gauge Ratings
NOTE:
Table 3 represents only the physical capabilities of the terminals. In addition
to the physical limitations, conductors must be electrically adequate per local
electrical safety regulations (such as the National Electrical Code
®
).
