Emerson XEV22D Especificaciones descargar pdf (Pagina 23)

Probes Digital Inputs • 17

11 Digital Inputs

The XEV22D comes with two (2) digital inputs: a

voltage-free input and a high voltage input; both can

be configured as cooling call. In this way the cooling

signal can come from the controllers with direct load

outputs or via the controllers with voltage-free out-

puts. One of these inputs must be configured as the

cooling call.

12 Forced Opening

If necessary, change the FOP parameter to force

the valve to open. For example, if FOP is set to 50

(FOP = 50), the valve will be opened at half of full

scale.

To disable this function, set the FOP to default

value (FOP = not used). The valve opening is en-

abled only when CCL digital input is enabled.

13 Electrical

Connections

The controller comes with a screw terminal block

to connect cables with a cross section up to 2.5 mm

Heat-resistant cables have to be used. Before connect-

ing the cables, verify that the power supply complies

with the controller’s requirements. Separate the probe

cables from the power supply cables, from the outputs

and the power connections.

Do not exceed the maxi-

mum current allowed on each relay, in case of heavier

loads, use a suitable external relay.

13.1.Probes

The recommended temperature probe placement is

illustrated in Figure 13-1, between 0 and 180 degrees

of inclination with respect to the horizontal pipe sec-

tion. For suction pressure probes, there is no particu-

lar recommendation.

14 RS485 Serial Line

All models can be connected to the monitoring and

supervising system XWEB3000. If Mod = StD, the

standard MODBUS-RTU protocol is used; if Mod =

AdU,

the custom XWEB library is required. This last

configuration makes it possible to use the same serial

address of the thermostat that gives the cooling re-

quest to XEV. In this way, it is possible to reduce the

number of addresses used.

Figure 13-1 - Recommended Temperature Probe Placement

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