Computronic Controls Sentinel 150 - Manual (Page 7)

Sentinel 150 installation, operation & maintenance ci0033 p7/8 issue 4 2015-09-03
Electrical Connection & Configuration (cont.)
Alarm outputs (cont.)
ESNTLUL150xxNFPA models
These models have two additional alarm outputs for
compliance with the NFPA 110 standard. Each solid-state
output has volt-free/dry contacts rated 250mA max @ 30 VDC:

Low battery voltage. This relay is energised during normal
charging, and de-energises (NC contacts closing) if a low
battery voltage is maintained for 120 seconds. This delay
allows for normal battery voltage variations, e.g. during
engine cranking.)

High battery voltage. This relay is de-energised in normal
operation, and energises (NO contacts closing) if a high
battery voltage is maintained for 120 seconds.
COM: common
This terminal is internally connected to battery negative DC.
It may be used as a convenient negative DC feed for the BST
(AutoBoost initiate) input, or as a return connection for a
remote relay or device driven by the (positive DC) charge fail
output. (See Typical Connection diagram.)
BST: AutoBoost Initiate
In normal operation, Sentinel automatically initiates AutoBoost
mode if battery voltage falls below a preset level, then returns
to float charge mode when the AutoBoost cycle is complete.
AutoBoost may also be manually initiated (at any time,
whatever the battery voltage) by momentarily linking the BST
and COM terminals, typically using a push-to-make, front-of-
panel push button. Sentinel automatically returns to float mode
at the end of a single AutoBoost cycle, even if the BST and
COM terminals remain linked.
AC Input (power supply)
Before AC connection, disconnection or
fuse replacement:

Isolate the AC supply

Ensure a good ground/earth connection
to the charger, to CN3 screw terminal
on standard (non-UL) models, or M4
chassis stud marked FG on UL models.

Ensure the AC supply voltage is
compatible with the charger’s supply
rating. Exceeding the rated voltage
may result in damage to the charger
and connected equipment, and cause
serious personal injury.

Fit only the fuse types/ratings shown on
each product’s label.
Standard (non-UL) SNTL150 and ESNTL150 models
Connect the AC input supply (live, neutral and ground) wires to
Sentinel connector CN3:
CN3
pin
Function
1
2
3 AC supply live, 95 to 265 VAC, 47 to 63 Hz
AC supply neutral
AC supply ground/earth
AC input and ground connections require 1mm²/17 AWG or
larger wire conductors.
AC fuse ratings are specified on the charger label. Open frame
SNTL150 models require connection of an external fuse in the
live AC supply wiring. Enclosed ESNTL150 models have a
replaceable TR5 package fuse, located on the circuit board near
connector CN3.
UL approved SNTLUL150 and ESNTLUL150 models
Connect the AC supply live and neutral wires to Sentinel
connector CN3:
CN3
pin
Function
1
-
2
AC supply live, 95 to 250 VAC, 47 to 63 Hz
(Centre terminal, no connection)
AC supply neutral
The AC supply ground/earth wire must be connected to the
separate M4 stud marked FG (frame ground), located near
CN3 on the charger’s metal base plate (open frame models) or
case chassis (enclosed models).
AC supply and ground connections require 1mm²/17 AWG or
larger wire conductors, rated for temperature 90°C/194°F.
AC fuse ratings are specified on the charger label. All UL models
have a replaceable TR5 package fuse, located on the circuit
board near connector CN3.
Fault Finding, Warranty and Maintenance
Warranty and servicing
Sentinel chargers are supplied with a 2 year warranty on parts
and workmanship.
Maintenance is limited to keeping the charger free from
ingress of dust, dirt or moisture, and ensuring clear air-flow for
ventilation.
In the event of an operating query or suspected fault, please
consult the sections in this manual, including the trouble-
shooting flowchart on page 8, or contact your supplier for
further advice before returning the charger.
WARNING: Except for fuse replacement on
some models, Sentinel battery chargers are
not user-serviceable, and should be returned
to the supplier in the event of failure.
No attempt should be made to repair the
charger. Any attempt to do so may invalidate
warranties, cause damage to the charger and
connected equipment, and result in serious
personal injury.
DANGER !
HIGH VOLTS