Operating Chargers In Parallel; Power On/Power Off Procedures; Verify Input Ac Supply; Verify Battery Voltage - Sens Q012-012 Installation & Operation Manual

Table 4: Alarm contact designations
RELAY
SUMMARY
CONTACTS
(on Control
PWA)
TB1-1
COMMON
COM
NORMALLY
CLOSED (NC)
TB1-3
OK
OPEN ON
ALARM
TB1-2
NORMALLY
FAIL
OPENED (NO)
Defaults to
FAIL with no
CLOSE ON
AC and DC
ALARM
power
For Normally Closed (NC) contacts wire from COM to OK. For Normally Open (NO) contacts wire from COM to FAIL.
6.4

Operating Chargers in Parallel

It is highly recommended that for proper operation of two chargers connected in parallel to the same battery that
one charger be equipped with a CommsGenius communications option and is connected to the second charger
with a digital load-sharing cable. See the CommsGenius User Manual available at www.sens-usa.com for more
information. The digital load sharing cable should never be connected when two chargers are each connect-
ed to different batteries.
7

POWER ON/POWER OFF PROCEDURES

7.1

Verify Input AC Supply

With the input AC and output DC breakers open, connect a portable voltmeter to the line side of the input AC
breaker on the charger. Energize the AC supply at main electrical panel and verify it is within acceptable range.
7.2

Verify Battery Voltage

With the input AC and output DC breakers open, connect a portable voltmeter to the load side of the DC
breaker and verify that the open circuit battery voltage is within acceptable range (see TABLE 5 below).
See Section 8.2 t o initially charge/commission zero charge batteries.
Table 5: Typical open circuit battery voltages for lead acid batteries
Number of Cells
Nominal Charger
Output Voltage
Open Circuit
Voltage
7.3

Verify Charger Output

Connect a portable voltmeter to the line side of the charger DC output circuit breaker. With the front panel
CHARGE MODE SELECT button, ensure the charger is in FLOAT mode (See Section 8.3). With the charger DC
output circuit breaker still open, close the charger AC input circuit breaker and verify that charger output comes up
to its nominal float setting. It should take less than 30 seconds for the charger output to reach its final value.
7.4

Begin Charging

Close the DC output breaker. Depending on the state of charge of the batteries and the load on the DC bus, the
charger may go into current limit at this time, in which case the output voltage as displayed on the LCD will be
reduced as the charger operates in constant current mode. Eventually as the battery is charged, the charging current
demand should taper to a value below the current limit set point of the charger, and the charger should revert to
constant voltage output, regulating the DC bus at the float level.
7.5

Power Off

Power off the charger by opening the AC and DC breakers, in any order.
Service hotline: 1.800.742.2326
1.303.678.7500
(Standard and Extended Alarm Relay Printed Circuit Boards)
CHARGER
AC FAIL HIGH DC
FAIL
TB4-1 TB5-1 TB6-1
COM COM COM
TB4-2 TB6-2
OK OK
Defaults to TB5-2 Defaults to
OK with no OK OK with no
AC and DC AC and DC
power power
TB5-3
FAIL
TB4-3 Defaults to TB6-3
FAIL FAIL with no FAIL
AC and DC
power
6 12
12 24
12.0-12.9 24.0-25.8 48.0-51.6
ALARM FUNCTION
BATTERY
GROUND CHECK
FAULT (Extended
Only)
TB7-1 TB8-1
COM COM
TB7-2 TB8-2
OK OK
Defaults to Defaults to
OK with no OK with no
AC and DC AC and DC
power power
TB7-3 TB8-3
FAIL FAIL
24 55 60
48 110 120
110-118 120-129
SENS IQ Technical Manual
BATTERY
END-OF-
LOW DC
DISCHARGE
(Extended Only)
TB9-1 TB10-1
COM COM
TB9-2 TB10-2
OK OK
TB9-3
TB10-3
FAIL
FAIL
Defaults to
Defaults to FAIL
FAIL with no
with no AC and
AC and DC
DC power
power
110 120
220 240
220-237 240-258
13