Honeywell ML7421A - Page 5

ML7421A,B ELECTRIC LINEAR VALVE ACTUATOR
63-2517—1
5
Fig. 6. ML7421 wiring diagram using a 2 to 10 Vdc output
control (e.g., T775) with two transformers.
L1 
(HOT)
L2
1
1
2
2
WIRING
STRIP
T1
+
T2
O1
R1
W1
B1
O2
1
1
2
2
3
3
4
5
6
L1 
(HOT)
L2
1
ML7421
T775 (WITH 2 TO 10 VDC OUTPUT)
DUAL
TRANSFORMERS
SENSOR
POWER SUPPLY. PROVIDE DISCONNECT MEANS 
AND OVERLOAD PROTECTION AS REQUIRED.

TERMINALS: T, Y, AND G DO NOT APPEAR ON 
THE WIRING BLOCK, OR EVEN ON ALL MODELS
BECAUSE THEY ARE FOR THE OPTIONAL 220 OHM
FEEDBACK POTENTIOMETER.
T
Y
G
M6747
Fig. 7. ML7421 wiring diagram using a 2 to 10 Vdc output
control (e.g., T775) with one transformer.
L1 
(HOT)
L2
1
1
2
2
WIRING
STRIP
T1
+
T2
O1
R1
W1
B1
O2
1
1
2
2
3
3
4
5
6
ML7421
T775 (WITH 2 TO 10 VDC OUTPUT)
SINGLE
TRANSFORMER
SENSOR
POWER SUPPLY. PROVIDE DISCONNECT MEANS 
AND OVERLOAD PROTECTION AS REQUIRED.

TERMINALS: T, Y, AND G DO NOT APPEAR ON 
THE WIRING BLOCK, OR EVEN ON ALL MODELS
BECAUSE THEY ARE FOR THE OPTIONAL 220 OHM
FEEDBACK POTENTIOMETER.
T
Y
G
M6748
40 VA, 24 VAC
Fig. 8. ML7421 wiring diagram using a 4 to 20 mA output
control (e.g., T775) with two transformers.
L1 
(HOT)
L2
1
1
2
2
WIRING
STRIP
T1
+
T2
O1
R1
W1
B1
O2
1
1
2
2
3
3
4
5
6
L1 
(HOT)
L2
1
ML7421
T775 (WITH 4 TO 20 MA OUTPUT)
DUAL
TRANSFORMERS
SENSOR
POWER SUPPLY. PROVIDE DISCONNECT MEANS 
AND OVERLOAD PROTECTION AS REQUIRED.

TERMINALS: T, Y, AND G DO NOT APPEAR ON 
THE WIRING BLOCK, OR EVEN ON ALL MODELS
BECAUSE THEY ARE FOR THE OPTIONAL 220 OHM
FEEDBACK POTENTIOMETER.
T
Y
G
M6749
500 OHM
RESISTOR
Fig. 9. ML7421 wiring diagram using a 4 to 20 mA output
control (e.g., T775) with one transformer.
L1 
(HOT)
L2
1
1
2
2
WIRING
STRIP
T1
+
T2
O1
R1
W1
B1
O2
1
2
3
4
5
6
ML7421
SINGLE
TRANSFORMER
SENSOR
POWER SUPPLY. PROVIDE DISCONNECT MEANS 
AND OVERLOAD PROTECTION AS REQUIRED.

TERMINALS: T, Y, AND G DO NOT APPEAR ON 
THE WIRING BLOCK, OR EVEN ON ALL MODELS
BECAUSE THEY ARE FOR THE OPTIONAL 220 OHM
FEEDBACK POTENTIOMETER.
T
Y
G
M6750
40 VA, 24 VAC
1
2
3
T775 (WITH 4 TO 20 MA OUTPUT)
500 OHM
RESISTOR