M&M RWB series User Manual

M&M R
EFRIGERATION
I
NC
. 3-53
Chapter 3: Operational Procedures
The following table lists the data entry and information fields on the screen and a
description of their purposes.
Suction Pressure Control Setpoints Definitions
Process Temperature Control Setpoints
The Process Temperature Control Setpoints screen allows the user to setup the Load
and Unload Controls for Automatic capacity control. The pulse and update time fields
are also used for slide valve positioning in the Sequenced mode. Included on this
screen is additional reference data to assist the operator when setting-up the compre-
sor. An example of the screen is shown below.
Process Temperature Control Setpoints Screen
PARAMETER DEFINITION RANGE
NORMAL
BANDWIDTH
Adjusts the sensitivity of the time proportional control routine. 0 - 20 PSID
CONTROL
DEADBAND
The slide valve will not be adjusted if the suction pressure is within
the control deadband.
0 - 20 PSID
LONG PULSE The longest load or unload pulse used to move the slide valve. 0.1 - 60 SEC
SHORT PULSE The shortest load or unload pulse used to move the slide valve. 0.1 - 60 SEC
UPDATE TIME
The time interval the CCS will wait before it re-calculates the slide
valve move time.
0.1 - 60 SEC
SETPOINT The current control setpoint group and value (reference). N/A
SUCTION PRESS The current suction pressure (reference). N/A
SV
POSITION
The current slide valve position (reference). N/A
SV MOVE TIME
The amount of time the load or unload solenoid will be actuated
for the current system parameters (reference).
N/A
SCREW MODE The current compressor mode (reference). N/A
SCREW STATE The current compressor state (reference). N/A
PROCESS TEMPERATURE day mm/dd/yy hh:mm:ss
CONTROL SETPOINTS
LOAD CONTROLS UNLOAD CONTROLS REFERENCE DATA
---------------- --------------------- ---------------------------------------
NORMAL BANDWIDTH XXX.X DEG XXX.X DEG SETPOINT P1 XXX.X DEGF
CONTROL DEADBAND XXX.X DEG XXX.X DEG
LONG PULSE XXX.X SEC XXX.X SEC PROCESS TEMP XXX.X DEGF
SHORT PULSE XXX.X SEC XXX.X SEC
UPDATE TIME XXX.X SEC XXX.X SEC SV POSITION XXX.X PCT
SV MOVE TIME XXX.X SEC
SCREW MODE SEQ
SCREW STATE FAILED

M&M RWB series Specifications

General

Brand	M&M
Model	RWB series
Category	Controller
Language	English