VYPER
™
VARIABLE SPEED DRIVE
OPERATION
100.200-IOM (SEP 13)
Page 48
Compressor Safeties Screen
To prevent the Slide Valve from unloading beyond a high
setpoint level (97%) and permit rapid compressor response
under load, make the following setting adjustments on the
Compressor Safeties Screen:
Step 1:
Press the
[MENU]
key and then selecting
“Setpoints”
and
“Compressor”
. Press the
[ENTER]
key to advance to the
Compressor Safeties Screen.
Figure 51 - Compressor Safeties Screen
1
2
Figure 52 - 2:1 Turndown Suggested Control Strategy
Step 2:
(Refer to Figure 51) Use the cursor arrow and
[Tab]
keys to navigate to the “Highest Capacity To Permit Starting”
(Callout 1) and “Compressor Automatic Mode Minimum Ca-
pacity” (Callout 2). Use the keypad to program the setpoints
to
“97%”
. Press the
[Enter]
key to accept the value for
each field.
Step 3:
Press the
[Submit]
key to accept the changes and
return to the operating status screen.
Example 2 - Suggested Control Strategy for Standard 2 to 1 (2:1) Turndown