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Chapter 4 – Start-up Procedure
Electronic Bypass
Jumper, Switch and
Pot Settings
Jumper J3
24 VDC
POWERED
I/O
DIP Switch Settings
Switch
Code
8 (A0)
7 (A1)
6 (A2)
5 (A3)
4 (A4)
3 (A5)
2 (A6)
1 (A7)
User Override Jumper
4-2
Figure 4-1 shows the locations of the jumpers, DIP switch and potentiometer
on the Electronic Bypass control board. The functions and settings of these
items are explained in the following paragraphs.
Jumper
Wires
R63
R64
110 VAC
POWERED
I/O
Figure 4-1
Electronic Bypass Control Board
The DIP switch is used to configure the bypass overload protection and
enable the automatic bypass feature.
Match the DIP Switch Codes to your drive model using Table 4-3.
Table 4-1 DIP Switch Settings
Overload protection configuration for frame size
A
B
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
ON
ON
OFF/ON = NEMA Class 30/NEMA Class 20
OFF/ON = Underload Protection Feature OFF/ON
OFF/ON = Automatic Bypass Feature OFF/ON
In the unlikely event of failure in the bypass control electronics, the user can
put the bypass in the drive mode by moving jumper J2 to the position as
shown in Figure 4-1. Power must first be applied to the system before placing
the jumper in the User Override position. When the jumper is in the User
Override position, the Drive contactor is energized and the Bypass contactor
is deenergized. The contactors are not controlled by the Electronic Bypass
keypad when the bypass is in the User Override mode.
Switch Setting Configurations
C
D
E
ON
OFF
ON
OFF
OFF
ON
ON
ON
overload trip curve
OFF/ON = Automatic Reset OFF/ON
ACH 400 with Electronic Bypass User's Manual
Dip Switch
ON
1 2 3 4 5 6 7 8
Jumper J2
Normal
User Override
Setting
Setting
50
Potentiometer
F
G
ON
OFF
OFF
ON
ON
ON
ON
ON
H
ON
ON
ON
ON
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