Check Setting Of The Fan Protection Switch (Only For L30Rs-L45Rs); Checking The Setting Of The Control-Power Transformer - Gardner Denver L30RS User And Service Manual

7 Preparations for commissioning
Recommended supply cable cross-sections and fuses for multi-wire cables or three current-carrying
conductors in raceway based on 86 °F ambient temperature
Compressor type
60-Hz-compressors
L30
L30RS
L37
L37RS
L45, L50
L45RS
Notes on the table:
Ultimately the type of cable you use, its length and
installation conditions (temperature, accumulation) are
outside the scope of our knowledge. Therefore the
above table only offers guidelines.
The gauges named in the table correspond to those in
UL508A. (Rubber sheathed cable at 86 °F and max.
55 yd cable length)
* If conditions differ (cable length, temperature and
accumulation) the gauge must be determined according
to UL508A. The cable type must also be taken into
consideration.
7.3.1 Check setting of the fan protection
switch (only for L30RS-L45RS)
Check the setting of the motor protection switch in
accordance with the enclosed circuit diagram for the
compressor.
Set the protection switch to the value stated in the table
corresponding to the mains voltage and frequency (see
circuit diagram).
Supply Installed
voltage nominal motor
power
[V] [hp]
200V
230V
40
460V
575V
40
460V
200V
230V
50
460V
575V
460V 50
200V
230V
60
460V
575V
460V 60
Fuse(s)
protection
(slow-blow
fuse) class J
140°F
[A]
175 AWG4/0
150 AWG3/0
70 AWG3
60 AWG4
70 AWG3
200 MCM250
175 AWG4/0
90 AWG2
70 AWG3
90 AWG1
250 MCM350
200 MCM300
100 AWG1/0
80 AWG2
110 AWG1/0
7.3.2 Checking the setting of the control-
power transformer
DANGER
High Voltage – Hazard of Shock, Burn, or
Death.
• The electrical connection should be
made by a qualified electrician.
• 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!
NOTICE
Incorrectly setting 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 correct setting should be checked by
measuring the control transformerʼs output
voltage while the system is running with a load.
Line cross section
conductor rated
167°F 194°F
AWG3/0 AWG2/0
AWG2/0 AWG1/0
AWG4 AWG4
AWG6 AWG6
AWG4 AWG4
AWG4/0 AWG3/0
AWG3/0 AWG2/0
AWG3 AWG4
AWG4 AWG6
AWG3 AWG3
MCM300 AWG4/0
AWG4/0 AWG3/0
AWG2
AWG2
AWG3 AWG4
AWG1 AWG2
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