The following parts have to be considered for making the change:
■ Jumpers in the drive motor terminal box
■ Jumpers in the fan motor terminal box
■ Drive motor overload protection relay
■ Fan motor protection switch
■ Control transformer
■ Jumpers in the control cabinet and transformer for the refrigeration dryer.
Material The required jumpers (also known as ’bridges’ or ’links’) are provided in the control cabinet.
Precondition A check has been made to ensure no voltage is present.
Changing the jumpers in the drive motor terminal box
➤ Open the terminal box and change the jumpers in accordance with the electrical diagram.
Changing the jumpers in the fan motor terminal box
➤ Open the terminal box and change the jumpers in accordance with the electrical diagram.
Adjusting the overload protection relay
Adjustment, in some cases, depends on the maximum working pressure of the machine. The
maximum working pressure [psig] is shown in brackets ( ).
➤ Check the overload protection relay setting.
ASD 25 ASD 30 ASD 40S ASD 40
208V, 3-ph, 60Hz [A] 43 (125) / 47 53 / 56 (217) 64 / 58 (217) 73
230V, 3-ph, 60Hz [A] 38 (125) / 44 50 57 / 52 (217) 66
460V, 3-ph, 60Hz [A] 19 (125) / 22 25 29 /26 (217) 33
Tab. 37 Overload protection relay settings.
Adjusting the fan motor protection switch
Motor protection switches for 208V/230V and 460V main voltage are already provided in the
control cabinet.
➤ Check the overload protection relay setting.
ASD 25 ASD 30 ASD 40S ASD 40
208V, 3-ph, 60Hz [A] 3.0 3.0 3.0 3.0
230V, 3-ph, 60Hz [A] 3.0 3.0 3.0 3.0
460V, 3-ph, 60Hz [A] 1.7 1.7 1.7 1.7
Tab. 38 Motor protection switch settings.
Connecting the control transformer
➤ Open the control cabinet and connect the control transformer in accordance with the electrical
diagram.
6 Installation
6.5 Making the Power Supply Connection
38
Service Manual Screw Compressor
ASD T Tri-Voltage 9_5721 06 USE
Option T2
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