Securitron BPS-24-2, 3, 4, 6 AND 10 User Manual
Page 3
PN# 500-10300
Page 3
Rev. D, 04/11
supply has gone into automatic shut off (discussed later). Always replace any blown fuse
with the same rated fuse.
FIG. 1: POWER SUPPLY WIRING WITH CCS-4 BOARD
R2
R1
B+
B-
F1
FA
P4
P3
P2
P1
COMMON NEGATIVE
DC RETURN (0 VOLT)
HO
T
N
E
U
T
G
RND
11
5 VAC
I
N
PU
T
H
N
G
TERMINALS R1-R4
CLASS 2 TERMINALS:
P1-P4 SUPPLY +V OUT.
EACH TERMINAL IS ON
WHICH IS APPROPRIATE
FOR INSTALLATIONS
WITH MULTIPLE LOADS
FIRE ALARM
N.C. CONTACTS
OPEN WHEN
ALARM ACTIVE
BATTERY
PACK
(OPTIONAL)
+
A SEPARATE POLYSWITCH
F2
AC
FUSE
H
DC
FUSE
R4
R3
RED
BLACK
ON
OF
F
SLIDE SWITCHES POWER AND DE-POWER EACH
"P" OUTPUT. LED'S SHOW OUTPUT STATUS
"H" TERMINAL IS SINGLE, HIGH-
CURRENT OUTPUT (UPSTREAM
OF POLYSWITCHES)
OPERATION OF AC AND DC
FUSES IS DESCRIBED IN
SECTION 3.5
The DC fuse should only trip if there is a short circuit in the supply itself (downstream short
circuits or overloads will trip individual Polyswitches). This could occur if the F1-H terminal block
somehow contacts DC negative. Alternately, if you are not using the “P” terminals for
downstream wiring but are using the “H” terminal to operate an individual, high current,
downstream load, a short circuit or overload could trip the DC fuse.
Securitron’s power supply family contains an
additional safety feature which is automatic shut
off in the event of a DC short circuit or overload.
This is often called a “crowbar” circuit. When you
are using the power supply without batteries, a
DC short circuit will usually cause the power supply
to shut itself off rather than tripping any fuse or
Polyswitch. If batteries are implemented, however,
they will attempt to drive into the load as soon as
the short circuit or overload occurs and the fuses
and/or Polyswitches will trip to maintain safety.
If this happens there is a reset procedure. First, correct the overload condition. Next,
remove all current from the Polyswitch for a period of 10 seconds. You do this by
moving the associated slide switch to the “off” position. Then wait 10 seconds, return the slide
switch to “on” and operation will return to normal. If you haven’t corrected the overload,
naturally the Polyswitch will trip again but you must always de-power and re-power the
Polyswitch to reset it.
The multiple safety features of these power supplies can be confusing so the following chart
provides summary information on operation of the safety features when the power supply is
used with and without batteries.