Computronic Controls Sentry - Manual (Page 5)

Sentry Iss7 Installation Instructions - December 03 - Page 5 of 6
Connection to Mains Supply:
Ensure supply is isolated before connection is made to charging unit
Ensure unit is properly earthed at earth stud on chargers metal chassis
CAUTION: Ensure correct AC voltage is supplied to unit, applying 230VAC on a
115VAC unit will destroy it and could cause serious personal injury.
Connection to Batteries:
Ensure mains supply is isolated before connecting charger to batteries
Ensure battery type and voltage are correct before connecting to batteries
WARNING: Charging either different voltage or type of batteries from stated type
may result in damage to both the charging unit and/or batteries and
could result in serious personal injury.
Disconnection of Batteries:
Ensure mains supply is isolated before disconnecting charger from batteries
WARNING: Disconnecting the batteries whilst mains supply is connected to the
charger could result in a spark at battery terminals, this could ignite
the hydrogen given off from the batteries.
Boost Initiate Connection:
The charger will be in it’s normal mode of operation whilst the boost link is bro-
ken, upon connecting the two boost initiate terminals the charger will perform a
single auto-boost cycle, whereby the charger outputs a higher voltage, once bat-
tery voltage has reached this point, the charger returns to it’s normal float mode
of operation.
Charge Fail Connection:
In a de-energised state the COM - N/C contact is alarmed. The relay energises
on power up and changes state to COM - N/O. These contacts are volt-free con-
tacts rated at 1A @ 30VDC.
Fuses:
The wall mounted enclosure models are fitted with internal mains input fuses at
the stated ratings (see F1 in above), the open frame models must be fitted with
an external mains fuse at ratings shown (see F1 in above). Before replacing any
fuses, ensure charger is isolated from mains supply.
Terminal Connection Information
+ - N L
O.I. Com N/O N/C
OUTPUT INPUT CHARGE FAIL BOOST
Output: To battery
CAUTION: Observe correct polarity
Input: AC supply
CAUTION: Observe correct voltage as stated on unit
Charge Fail: O.I. - Output Inhibit
(will prevent unit from showing charge fail in case of
overvoltage from alternator)
Com - Common
N/O - Normally Open
N/C - Normally Closed
(See notes on connection of charge fail - see right)
Boost: Boost Initiate - Linking these two connectors will force
the charger from into a single boost cycle of operation.
(Once the charger has completed a single boost cycle
as outlined on page 1 of these instructions the charger
returns to it’s normal mode of operation)
Stripped wire is introduced just
before the clamping unit.
The clamp spring is pressed down
and wire is introduced into the
clamping unit immediately
The clamp spring is released - the
conductor is automatically clamped
NB. All connections, including AC input and DC output are made via
spring-clamp connections as outlined above.
IMPORTANT OPERATING INSTRUCTIONS -
SAVE THESE INSTRUCTIONS
Before operating the battery charger, ensure that the charger is assembled and installed as per the
section listed in these instructions.
All Sentry UL (SUL & ESUL) models are fitted with a self-resetting polyfuse on the dc output. If reverse polarity or short circuit faults are made, isolate
supply, disconnect the outputs and allow fuse to self-reset. The charger can then be re-connected and switched back on. No replacement of output fuse
should be necessary. If fuse fails to reset, the charger should be returned to supplier.
AUTOMATIC BATTERY CHARGER
The Sentry UL range is an automatic battery charger, if battery voltage falls below a preset voltage (10.2V on a 12V lead-acid battery) the charger will
automatically enter an increased charging voltage state (boost). Once the batteries have reached this point, the charger will switch to it’s normal “float”
voltage. this prevents over-charge, which inturn prevents the battery from over-gassing and subsequently maximises battery life.
WARNING: DANGER OF INJURY OR DEATH. Before connection, disconnection or handling
of SENTRY battery charger, ensure that all AC power supplies are isolated. Connection to or disconnec-
tion from live wiring can also cause damage to internal components.
ELECTRICAL CONNECTION
WARNING: The Sentry UL range is not USER SERVICEABLE. No attempt should be made to replace or repair the charger, any attempt to do so may
invalidate any warranties and could cause serious personal harm or injury as well as damage to both the battery charger and any connected devices.
In event of failure the charger should be returned to supplier.