1.18.1 Start control
The disconnect box has a DRY PUMP POWER ON/RESET push button for operational
control of the iH system power supply.
1.18.2 Emergency off control
If an emergency condition arises, the pump system can be shut down in two ways: red
EMERGENCY OFF button located on the control panel, or: EMO signal through 6-way XLR
connector from the pump. If the EMERGENCY OFF push button is used, the button must be
reset by twisting the button until it releases back out, prior to restarting the system with the
use of the DRY PUMP POWER ON/RESET push button.
1.18.3 Brownout protection
The disconnect box is equipped with a time delay relay which enables the system to continue
running as normal if a brownout occurs (of 3 seconds or less). If the brownout lasts over 3
seconds the disconnect box will shutoff power to the system. If this occurs, it will be
necessary to restart the system by using the DRY PUMP POWER ON/RESET push button
after the condition is corrected.
1.18.4 Circuit protection
The disconnect box circuits are protected by circuit breakers and fuses (refer to Figure 3-13).
The supply voltage to the box is protected by a 35 amp fused mains disconnect. If any of the
fuses fail (F1-F3), the power to the disconnect box will be disabled and the iH system will be
shut down.
The transformer primary is protected by two (2) fuses, F4 and F5. If either of these fuses fail,
the 24 VAC control circuit is shut down and the pump system is switched off.
The 24 VAC system is protected by a single fuse, F6. If this fuse fails, the control circuit is shut
down and the system is switched off.
Circuit breaker CB1 protects the supply to the photohelic gauge (see Section 1.19). If this
breaker trips, the photohelic gauge will not operate.
1.19 iH photohelic switch/gauge (accessory)
The iH photohelic switch/gauge accessory allows monitoring for loss of extraction from the
enclosure, thereby satisfying SEMI S2 requirements. Refer to Section 8 for ordering
information.
1.20 Accessories
A number of accessories are available to configure the iH system for your specific application.
Refer to Section 8 for descriptions of these accessories.
1-30 iH Dry Pumping System
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