Aviation_Control_Inverter

Ferranti Control Inverter Box, Type E

• Output 115V 400Hz

Markings

• ST.REF.No. 6A/6846
• SerNo 804/64
• (Alt) 6A/105831
• INST/A471
• INST/A660
• UFI

Appearance

images

DC Input

+A	+ve 26 VDC	1-3-0
		2-0-4
-B	0v	1-4-2
		2-0-3
Chassis		2-0-6
		2-0-5
		1-5-9

• When DC is applied approx 1/2 amp is drawn from DC supply with no additional AC load

12 pin connector, ART.HORIZON

A	Rly-3-1	gen sw AC out - 68 ohms to B-	2-0-1
B	B-	Common negative, chassis	2-0-2
C	Inductor	ind AC out - 31 ohms to A	1-6-0
D	Rly-2-8	AC out switched	1-5-2
E	Rly-2-4	AC out switched	1-5-1
F	Rly-3-5	sw relay out	1-4-9
H	Rly-1-1	H-J switched-a (B-)	1-5-5
J	Rly-1-3	H-J switched-b	1-3-6
K	Rly-1-7	K-N switched-a	1-3-7
L	Rly-4-8	switched DC	1-4-8
M	Rly123-Pve	Relay energise input	1-5-6
N	Rly-1-5	K-N switched-b	1-5-3

Output Transformer

transformer

transformer-pins

1	n/c
2	tr2-e	1-0-8
3	B-	1-1-8, 1-1-7
4	B-	1-1-6, 1-1-7, 1-0-1
5	n/c
6	n/c
7	sw +ve	1-1-0, 1-2-2
8	n/c
9	tr1-e	1-0-4
10	gen AC	1-1-9
11	B-	1-2-0, 1-1-8, 1-2-1

• small capacitor on transformer pins 7 to 11

transistor capacitor

-ve	1-0-1, 1-0-2
+ve	1-4-1

transistor-1

b	1-0-3
e	1-0-4
c	1-0-5, 1-4-0

transistor-2

b	1-0-7
e	1-0-8
c	1-0-6, 1-4-0

Inductor output

C
1-2-5
1-6-0
A
1-2-3
1-2-4

Capacitor output

A
1-5-0
2-0-1
B
1-5-5
2-0-2

Relays

• 26 Volt, 618 Ohm, DPCO

Relays

• rly4 - rly3 - rly2 -rly1

Relay Relay

pin numbering

• 10 is AC transformer output, gen AC
• Letters are output connector terminals
• 1-2_9 is wire identification number

1-1	ncl	H	1-5-4
1-3	com	J	1-5-8
1-8	nop	n/c
1-5	ncl	N	1-5-3
1-7	com	K	1-5-7
1-4	nop	n/c
1-2	coil		1-5-5
1-6	coil		1-5-6, 1-6-1
2-1	ncl	n/c
2-3	com	10	1-6-8, 1-6-9
2-8	nop	D	1-9-2
2-5	ncl	n/c
2-7	com	10	1-6-9
2-4	nop	E	1-5-1
2-2	coil		1-6-4, 1-6-5
2-6	coil		1-6-6, 1-6-7
3-1	ncl	A	1-5-0, 1-2-3
3-3	com	10	1-1-9, 1-6-8
3-8	nop	n/c
3-5	ncl	F	1-4-9
3-7	com	sw +ve	1-2-2
3-4	nop	n/c
3-2	coil		1-6-4
3-6	coil		1-6-6
4-1	ncl	n/c
4-3	com	?	1-2-9
4-8	nop	L	1-4-8
4-5	ncl	n/c
4-7	com	n/c
4-4	nop	n/c
4-2	coil	B-	1-6-3, 1-4-3
4-6	coil		1-2-7

• Relay 4 is activated when main DC power is applied
• Relays 1,2,3 coils are wired in parallel and activated when +ve applied to input M

Button capacitor

-	1-0-1, 1-4-2, 1-4-3
+	1-0-9, 1-2-8

c 11	1-2-1
c red,d red,r	1-2-6, 1-2-7
r	1-1-1
d yellow, sw +ve	1-1-0

Diode

+ve DC in	1-3-0
diode DC+	1-2-8, 1-2-9, 1-0-6

capacitors

A+	2-0-4
Chassis	2-0-5
B-	2-0-3
Chassis	2-0-6
Chassis	1-5-9
B-	1-5-5, 2-0-2
	1-5-0, 2-0-1

internal wiring

1-2-9	rly4-3	diode DC+