ABB IRC5P, Product Manual, Page: 49 / 220

5 Installation and Commissioning
Product Manual, Control Cabinet IRC5P 3HNA009834-001 en Rev.06 49
5.2 Component Installation
5.2.4 Purge Unit Installation
General
The purge unit must be installed between the control cabinet and the robot to
provide compressed air inside of the robot to prevent hazardous gases from entering
into the robot interior.
The purge unit is available in a special version, called ‘Purge Unit with Connector
Box’, for use with trolley mounted robots. For installation of this purge unit, see
’Purge Unit w/Connector Box’ on page 111.
Non-ex robots may be supplied with a pressurized junction box substituting the
purge unit. The design of this box is the same as the purge unit, but it includes only
supply pressure on/off valve and maintenance pressure regulator and gauge.
Purge Unit Location
The purge unit must be installed outside the hazardous area, e.g. on the cabin wall
(the cabin wall must be grounded).
The distance from the control cabinet to the purge unit and from the purge unit to
the manipulator must be planned in accordance to the length of the supplied cables.
The cables may be supplied in standard lengths or lengths specified by the customer.
It is recommended to install (locate) the purge unit preliminary and wait with
finding the final position until after the cables have been laid.
Flexible Hose Layout
The flexible hose is normally laid in a cable conduit. The hose is resistant to
solvents.
CAUTION!
The flexible hose must not be stretched as this will put strain on the
internal cables which can not be stretched in the same way. If the flexible hose is to
be installed in vertical direction, e.g. where the robot and purge unit are placed on
different floors, the flexible hose MUST be secured with suitable clamps at e.g.
600 mm distance to prevent the weight of the hose to apply strain to the internal
cables.
A flexible hose laying horizontally in a cable conduit does not need to be clamped.
Purge Unit Air
Connection
The purge system must be connected to a clean air supply such as instrument air.
This is important to avoid internal contamination and corrosion. The air connection
must be able to supply approx. 30 m³/h during the purging sequence and 0.3 m³/h
during normal operation (maintenance pressure). The purging sequence time at
start-up is depending on the robot type as noted on the robot identification plate on
the manipulator, see ‘Product Manual, Manipulator’, System Description.
For specification of the purge air, see also ’Purge Unit Specifications’ on page 36.