Ametek Western Research IPS-4, User Manual

Page: 29 / 238

Overview | 1-11
Figure 1-4.
Pressurization System
State diagram.
BOX PRESSURIZED
POWER OFF
ALARM RED TO GREEN
POWER OFF
ALARM (RED)
START
BYPASS MODE
ANALYZER ON
TIMING START
POWER ON FAST PURGE OFF
LEAKAGE COMPENSATION
HOLDING 2mb
NORMAL OPERATION
IPS-4 PURGE SYSTEM STATE DIAGRAM
PRESSURE SETTINGS
ENCLOSURE
PRESSURE
ALARM
AND PURGE
OPERATING OPERATING
SET LEAK
COMPENSATION
TO THIS
MIN. PRESS
TO RUN THIS
TIMER
VENT
OPENS
0.2" wc
0.5mb
min.
0.8" wc
2.0mb
1.4"wc
3.5.mb
min
4" wc
10mb
Supply air lost
or Door open
Box pressure <0.5mb or
purge <3.5mb in vent
Loss of air
or Door open
Key Active
+ Air in ≥ 60psi
+ Door closed
Apply AC
No air
>60psi air
+ Key in Bypass
Loss of air
Key to active
Key to Bypass
Box Press >0.5mb
+ Purge >3.5mb
Box drops <0.5mb
or Purge <3.5mb
Box drops <0.5mb
Min. purge time
(5 mins) met
Key to
Active
Key to
Bypass
IPS-4 PURGE SYSTEM STATE DIAGRAM