Pressure Relief Valve; Connecting Terminals In The Switch Cabinet/Control Transformer Setting - Gardner Denver L55 User And Service Manual

10.8 Pressure relief valve

DANGER
When checking pressure relief valve there is
an explosive release of pressure.
Failure to perform this operation in a safe
manner or without safety equipment may
result in personal injury or death.
· Use the appropriate safety equipment,
hearing and eye protection, and use
safety precautions when performing this
PRV check on an operating machine.
2
1
Fig. 22
1 Pressure relief valve
2 Valve cap
The pressure relief valve has no user serviceable or
repairable components.
Testing the pressure relief valve
The valve can be tested:
1 On a separate compressed-air system. or
2 When raising the system operating pressure to its
normal level.
Keep local legislation in mind when testing.
Pressure relief valve operation ( -1- Fig. 22) depends
on the valve type and can be carried out by:
·
Lightly turning the valve cap ( -2- Fig. 22)
(1-2 turns), and subsequently closing it again.
·
Operating the lifting lever/pull ring.
If the pressure relief valve doesn't close itself or is
leaky, close the doors of the compressor and push the
Stop Button. After the pressure in the pressure
reservoir is reduced to ambient pressure, renew the
pressure relief valve.
August 20, 2018
DANGER
A defective pressure relief valve may result
in pressure that is too high, breaking open
parts of the system and causing serious or
fatal injury.
Never operate a screw compressor system
with a defective pressure relief valve or
without pressure relief valve!
10.9 Connecting terminals in the switch
cabinet/control transformer setting
DANGER
High voltage – Hazard of shock, burns, or
death
· Only qualified electricians may work on
the switch cabinet.
· Only perform checks and carry out work
on the screw compressor when the unit
is out of operation, depressurized, and
secured from being switched on again!
· Push the STOP button on the control
panel. After the soft-stop tiime (30 sec.),
set the on-site main switch to "0"(OFF)
and secure it against being switched on.
DANGER
Only for L55RS-L75RS: There is a risk of
electric shock from charged capacitors!
· Disconnect the system from the mains
and wait 10 minutes before touching
electrical components. The power
capacitors need this time to discharge.
NOTICE
Making incorrect settings to the control
transformer poses a risk to the trouble-free
operating of the system.
Checking the setting of the control transformer
is part of commissioning and part of regular
inspection/maintenance because the supply
voltage can change.
The connecting terminals in the switch cabinet have to
be checked and, if required, re-tightened during first
commissioning and afterward according to the
maintenance schedule.
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