Emerson Fluid Chiller Guía para resolver problemas descargar pdf (Pagina 55)

Emerson Climate TechnologiesEmerson Climate Technologies

Temperature-Pressure Controls

Emerson Climate Technologies

Setpoints

PS1/PS2 are adjustable controls with external ad-

justment spindles for range and differential. Note that

manual reset controls have a xed differential and no

differential spindle. By turning the range spindle, the

upper setpoint is dened and by adjusting the differential

spindle, the differential and the lower setpoint is dened.

The dependency between upper and lower setpoint is

always as follows:

lower setpoint = upper setpoint – differential

The following two rules should be kept in mind:

➯ an adjustment of the range spindle always affects

both upper and lower setpoint.

➯ an adjustment of the differential spindle affects the

lower setpoint, only.

The controls are equipped with display scale and point-

ers to show the approximate settings. The display scales

are printed in relative pressure units “bar” and “psi”. For

precise setting of the controls, external gauges must be

used.

Contact Function

Contacts on Single Pressostats, PS1 are labeled

1-2-4 where ‘1’ refers to the common pole, ‘2’ refers to

the lower setpoint and ‘4’ refers to the upper setpoint.

This is true for all types of controls, irrespective whether

they are low pressure controls, high pressure controls,

manual or automatic reset types.

The contact function for automatic and manual reset

versions is as described below.

Automatic Reset

When pressure rises above the upper setpoint,

contacts 1-2 open and contacts 1-4 close. On decreas-

ing temperature lower setpoint contacts 1-4 open and

contacts 1-2 close.

Automatic reset contact function

Manual Reset Low Pressure

When pressure drops below the lower setpoint,

contacts 1-4 open, contacts 1-2 close and latch. Only

on pressure rise above upper setpoint and after press-

ing the manual reset button contacts 1-2 will open and

contacts 1-4 will close again.

Manual reset low pressure contact function

Manual Reset High Pressure

When pressure rises above the upper setpoint,

contacts 1-2 open, contacts 1-4 close and latch. Only on

falling pressure below lower setpoint and after press-

ing the manual reset button, contacts 1-4 will open and

contacts 1-2 will close again.

Manual reset high pressure contact function

For operational safety, all PS1/PS2 with manual

reset are designed as trip-free controls, i.e. pressing the

manual reset button while the pressure has not reached

its reset threshold will not operate the electrical contacts.

As Dual Pressostats PS2 have two sets of contacts,

their function is the same as on Single Pressostats PS1

with the only difference that the contact labels are pre-

ceded by an additional index. One side of the control is

labeled 11-12-14 and the second side is 21-22-24.

The contact function of controls with convertible reset

is as described above but depends on the position of the

convertible reset toggle, i.e. automatic or manual reset

position.

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 71 72

Comentarios a estos manuales

Sin comentarios

Emerson Fluid Chiller Guía para resolver problemas Pagina 55

Comentarios a estos manuales

Relacionado con productos y manuales para No Emerson Fluid Chiller