Flowserve SIHI dry Standard H Series Instruction & Operation Manual Download

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Flowserve US Inc.

SIHI

dry

Standard

Standard M Series

Dry Running Vacuum Pump

Issue Date: November 21, 2016 Copyright:

FLOWSERVE SIHI Pumps Rev 1

9.8 SIHIdry

Control Sequence [Control Optional Feature]

Purge control device causes that motor and electronics casing will be flushed and supplied with purge
gas [NFPA496]. After termination of the flushing process the power supply of the SIHIdry

electronics

[STE12 Board] is released by a signal contact. Then the pump is ready for operation.

Figure 21: Operation Flow Chart

The starting signal can be activated by the control system or (optional) directly at the control panel of the pump.
The unit begins with the rotor diagnosis. Then the center position of the mechanical gear is traced. Then during
operation the electronic gear causes that the mechanical gear never will be in engagement. During the rotor
diagnosis the output warning is selected and (if used) the corresponding light signal is switched on. After completing
the diagnosis, the SIHIdry system switches to the

Warm-up mode

; the ‘Operation’ message is displayed in all

conditions under which the pump operates.
The pump remains in the Warm-up mode until the input 'Tmin' is active. The suction-side valve remains closed
and the pump is operated at a higher speed. Once the minimum temperature is reached (input 'Tmin' is active), the
pump switches to the

Standby mode

The connection of a temperature recording (

input Tmin

– optional) makes possible to set 2 different speeds

(

stand-by

and

warm up

The change from/to this mode of operation is initiated by the control signal

vacuum requirement

or by the

corresponding switch at the optional control panel.

Switching over to

vacuum mode

is possible only when the pump has reached a minimum temperature, i.e.

when the pump is warmed up. W hen the pump is rotating always the output operation is selected and (optional) the
corresponding indicator is switched on. During

vacuum mode

the pump follows the

set point value

and the suction

valve will be opened. The

vacuum mode

is the pumping phase of the pump; in this phase the

output vacuum

mode output

is selected and (if exists) the corresponding indicator is switched on.

The control signal

vacuum requirement

enables to switch over to

stand by

operation at any time. Then the

suction valve (optional) will be closed immediately.

The

input Tmin

does not have any influence when switching over from

vacuum mode

stand by mode

By means of the control signal

cleaning requirement

or (optional) the corresponding switch, it is possible to

switch over to the state cleaning. The pump is operated at a constant speed (solvent injecting speed) and the
solvent flushing valve will be opened. In this phase the output cleaning is selected or (optional) the corresponding
indicator is switched on. The

cleaning operation

serves to flush and to clean of the displacement rotors by

means of a solvent.

It is possible to stop the pump at any time with the aid of the input stop or (optional) the corresponding key of
the control panel. Hereby the pump is stopped immediately and (optional) the suction valve will be closed.