Emerson VSG & VSSG Specifications download pdf (Page 67)

5 – 3

Section 5 • Configuration - Supervisor Level

Single Screw Compressor PLC Operation Manual • Vilter/Emerson • 35391CM

PROCESS VARIABLE SOURCE

Deﬁ nes the pressure data used to control the capacity

slide.

• Local Hard-Wired Transducer – capacity slide and

auto start/stop is controlled by the suction/discharge

pressure transducer mounted on the compressor

unit or package.

• Common/Remote – capacity slide and auto start/

stop is controlled by suction/discharge header pres-

sure data from a DCS/Central Controller. On loss of

communications, the compressor control will ei-

ther shut down the compressor or revert to the lo-

cal transducer based on the “Communication Fault

Action” setting.

CONTROL MODE

Deﬁ nes the pressure or temperature the compres-

sor will try to maintain. See Section X “Operational

Descriptions” for more information on the functionality

of each control mode.

SELECT SETPOINT 1 / 2

Determines which group of setpoints is active – used

when a machine could be run in 2 unique sets of oper-

ating conditions, ex. High/low stage swing compressor.

AUTO START-STOP

Enables or Disables the auto start-stop function. See

Section X “Operational Descriptions” for more informa-

tion on the functionality of the auto start-stop function.

OIL PUMP OPERATION

Determines operation of the oil pump.

• Full Time – the oil pump will run continuously when

the compressor is running.

• Part Time – the oil pump will run at compressor start-

up but will stop if there is enough differential pres-

sure from discharge-suction.

See the compressor start sequence in Section X

“Operational Descriptions” for more information on the

functionality of the oil pump.

MOTOR RTDs

Selects if Motor Winding and Bearing Temperatures are

being monitored by the controller.

SCHEDULED MAINTENANCE TIMER

Optional function that can be set up to display main-

tenance reminders after a settable amount of run-

time. When the accumulated runtime reaches the set

“Maintenance Interval” time, a status message will ap-

pear on the overview and menu screens indicating the

text entered in the “Message” ﬁ eld.

INLET / OUTLET SCRUBBER PUMP A / B

If the inlet and/or outlet scrubbers include dual conden-

sate pumps, this selection determines which pump is

active.

CHANGE PASSWORD

Pressing the “Change Password” button opens the

“Change Password” pop-up screen, see Figure 5-3 To

change a password on an account, the user must be

logged in under that account.

Figure 5-3. Change Password Pop-Up Screen - Supervisor Level

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Emerson VSG & VSSG Specifications Page 67

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