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D758 / D771 MOTOR SYSTEMS
The Motor Purging and Pressurization control system has
been designed for use on large electrical machines located in a
hazardous location.
The system delivers a high purge rate for a given duration (as
defined by machine designer and Notified Body) prior to start
up, to purge any potentially explosive gases from the machine.
After purge, the system automatically switches to leakage
compensation mode for normal operation. Expo’s Closed Loop
Automatic Pressurization System (CLAPS) automatically com
pensate for pressure variations in the machine during start-up
or through temperature variations during operation. The sys
tem enables the machine to continuously operate at a set over-pressure, saving considerable time during test and commis
sioning, simplifying normal operations.
Features
Ambient temperature range: Certified for use from –20°C
to +55°C (-4°F to +131°F)
User Selectable Settings:
5 pre-set selectable purge flow rates
(2,000/3,000/4,000/5,000/6,000 Nl/min)
(71/106/141/177/212 SCFM)
1-99 minute purge time (-0/+3 seconds tolerance). Suits a
wide variety of machine frames sizes
Clear Visual Status Indication: Local indicators for "Alarm/Pressurized" and "Purging".
Continuous Operation through Closed Loop Automatic
Pressurization System (CLAPS): Eliminates spurious trips
on start-up or load change.
316L Stainless Steel enclosure & fittings: Excellent re
sistance to corrosion for harsh environments.
Full Compliance with Standards - Direct purge flow meas
urement at Relief Valve exhaust orifice.
Global Approvals – IECEx; ATEX; INMETRO; EAC
Signal outputs:
D758: volt-free contact closures terminated inside an Ex e
junction box.
D771: outputs are suitable for connection to intrinsically
safe circuits
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