Arcam FMJ P7 Service Manual page 29

1 2
Transformer Specification For 115/230V P7 transformer
Arcam Part Number L911TX
Material Safety Specification
1. Winding Wire to be Grade 2 (130C rating) to BS 60317-4 1995
2. Mylar Polyester Insulator 130C Rated
D
3. Potting Compound PC3502 E135297(M)
Mechanical Specification
1. Middle of transformer to be potted (as shown).
2. Primary windings connect to 6 way MOLEX connector 39-01-2065.
Secondary
windings connect to 2 way molex connector 39-01-3028. Use MOLEX pin
44476-3112.
MOLEX connectors have pin numbers indicated on them.
3. Primary wires are enclosed in a common sleeve. Each secondary
winding is individually sleeved.
Use PVC sleeving.
4. All wire lengths in mm. Lengths are +5.0, -0
5. Please adhere rubber insulating pad to bottom of transformer as shown.
Electrical Specification
1. Transformer to have dual 115V primaries to allow parallel operation for
115V input and series operation with 230V input.
2. Transformer input voltage range
115V -18% +14% (97.5V to 132 5V)
C
230V -18% +14% (195V to 265V)
3. Transformer to have 7 secondary windings as show in the adjacent
drawing.
4. Loaded DC voltages specified at 230V AC in (with transformer primaries
in series)
5. Each secondary winding to have a full wave (4diode) bridge to produce a
single DC rail.
(AS shown in diagram)
Output Capacitance to be 10000uF per rail.
VOUTmin = 52V dc @ Io = 2A (with 230V AC in) See dwg
This figure to be the minimum voltage on the reservoir capacitor as shown
in the diagram
B
Voltage on Reservoir Capacitor
52V
10mS
TEST CIRCUIT (PER OUTPUT)
AC N
+
10000uF
A
1 2
3
Connector Latch
6 5 4 2 1
3 2 1
6 way 2 way
Pin outs of Molex connectors
As viewed looking down at the end
the wires enter the connector
PRIMARY WIRES
LEADS EXIT FROM BOTTOM
6 way MOLEX 39-01-2065
UL94- V0
2WAY 10-11-2023 molex
VOUT min
+VOUT
2A load
-VOUT
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB
Filename
J:\Development Projects\P7 Amp\Transformer Design\L911TX 1.ddb - Documents\L911TX 1.sch
3
4 5
145mm dia max
POTTING COMPOUND
M12 Threaded Brass Insert
NSERT TO ALLOW 30mm DEPTH OF THREAD
Rubber insulating pad
PRIMAR ES
THERMAL TRIP
SCREEN W RE
M4 CRIMP EYELET
200mm
280mm
280mm
DRAWING TITLE
POWER TRANSFORMER FOR P7 115/230V
23425
Circuit Diagram
Notes
4 5
6 7
SECONDARY WIRES
LEADS EXIT FROM BOTTOM
PRIMARY
6 WAY CONN P N 1 BROWN
115V ac
1
2 6 WAY CONN P N 3 WHITE
3
4
5 6 WAY CONN P N 4 BLACK
6
115V ac
6 WAY CONN P N 6 BLUE
SECONDARY 1
FOR LENGTH OF SECONDAR ES
SEE TABLE BELOW
SECONDARY 7
SECONDARY
1
2
3
4
5
6
7
KAL 05-03-2002 Lead Out Changes to suit new wiring arrangement in amplifier
KAL 4-12-2001 Lead Out Changes
ECO No. INITIALS DATE DESCRIPTION OF CHANGE
Date Printed Drawn by:
Sheet
KAL
6-Mar-2002
6 7
8
SECONDARY
RED
1
2
OR
RED
D
1
2
OR
RED
1
2
OR
RED
1
2
OR
RED
1
2
OR
RED
1
2
OR
C
RED
1
2
OR
1
100C THERMAL TRIP
2
NORMALLY CLOSED
RESETTABLE
2WAY 10-11-2023 molex
SCREEN WIRE GRN/YELL
M4 CRIMP EYELET
B
2 way MOLEX 39-01-3028
2 way MOLEX 39-01-3028
LENGTH
520
560
550
570
570
610
650
A
1
Mechanical Changes D
ISSUE
1 of 1
L911TX
DRAWING NO.
8