Emerson XM678D, Operation And Installation Manual

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10 • XM678D I&O Manual 026-1219 Rev 3
6.5.3. Stepper Valve Connection
The EX3 unipolar valve has to be connected to the
following terminals listed in Table 6-6 .
6.5.4. EX3-C230
E.I connection of EX3 with oA1 = E3r and 230V coil of solenoid valve.
6.6. Absolute Maximum
Power
XM678D is capable of driving a wide range of stepper
valves. Table 6-7 lists the maximum amount of
current that the actuator can supply to the stepper
wiring. The 640-0041 or 640-0040 (24V out,

20VA min) transformer should be used.
XM678D EX3
Terminal 49 Grey wire
Terminal 48 Blue wire
Terminal 47 Black wire
Terminal 46 Brown wire
Terminal 45 White wire
Table 6-6 - EX3 Unipolar Valve Terminals
Figure 6-2 - EX3-C230 Connection
NOTE: The electrical power absorption of the
valve is not related to the valve’s refrigeration
power. Before using the actuator, please read
the technical manual of the valve supplied by
the manufacturer and check the maximum current
used to drive the valve; verify that the values are lower
than those indicated in Table 6-7.
VALVE
TYPE
BIPOLAR VALVES
(4 wires)
Max Current
0.9A
UNIPOLAR VALVES
(5-6 wires)
Max Current
0.33A
Table 6-7 - Absolute Maximum Power