Specifications are subject to change without notice. No liability accepted for errors or omissions.
3
1.
INTRODUCTION
The
SR750L
range is designed for use as a very accurate AC to DC power supply, or float charger for lead
acid batteries. Note that for float charging the output voltage must be set to approximately 15% above the
nominal battery voltage.
2.
CONNECTIONS
If used as a float charger always connect the positive output of the power supply to the positive terminal of
the battery. The charger may be permanently connected to float charge lead acid batteries but it is essential
to periodically check the electrolyte level of flooded cells as there is always some evaporation.
Where screw/plug in terminals are fitted (eg. SR500A24FXL), and there are two terminals provided for each
polarity, both terminals must be used. This is to ensure that the current rating of the terminal block is not
exceeded.
CONNECTION LAYOUT
3.
LED INDICATION CODES
DC OK
LED indicates DC output is present, either from PSU or battery (if connected)
Slow flash:
DC LOW
Fast flash:
DC HIGH
POWER OK
LED indicates input power on (unless there is a short circuit on the output)
4.
STANDBY FUNCTION
Pushing the
STANDBY
button turns the output of the power supply off. If there is a battery con
nected, the
DC OK
LED remains on even though the power supply is turned off.
5.
INPUT CONNECTIONS FOR DC INPUT MODELS
BROWN :
PO
BLUE:
NEGATIVE -
GREEN/YELLOW:
EARTH
ALARM TERMINAL LAYOUT
Relay contacts shown in
de-energised
state (ie when there is a fault condition).
Alarm relays are
energised
when power supply is operating normally.
FG terminal is connected to the metal case.
DC HIGH
MAINS FAIL
DC OK
COM
NC
NO
COM
NC
NO
COM
NC
NO
FG
+
-
tempco
sensor
OUTPUT
DC HIGH
MAINS
FAIL
DC LOW
FG
RS485
AC INPUT
