ABB ACH550 User Manual page 25

E-Bypass Configurations for ACH550 Drives
position. The system is incapable of Bypass or Override operation in this
configuration.
Overload Trip Current Adjustment Potentiometer
The overload protection trip current must be adjusted to the motor nameplate current
using the P1 adjustment potentiometer located in the lower right hand area of the
bypass control board – see "Adjustment Locations" on page 19. The following table
shows the trip currents for the various frame sizes for potentiometer settings of 10 to
100.
Potentiometer
Underload Trip Current Adjustment Potentiometer
The underload protection trip current must be adjusted to a percentage of the motor
nameplate current using the P2 adjustment potentiometer located in the lower right
hand area of the bypass control board – see "Adjustment Locations" on page 19.
Potentiometer settings are adjustable from 0 to 100% of the P1 (overload trip)
setting. The default setting is 0% which effectively removes the underload protection
trip feature from the system.
Circuit Breaker Settings
On an ACH550 E-Bypass with output ratings above 120 amps, the circuit breaker
has adjustable switch settings for instantaneous and overload current protection.
The factory default settings are practical for most applications. Refer to the "ABB
SACE Instruction Sheet" (supplied with floor mounted units) for additional
information on the adjustment of these settings.
Setting
A
10 1.2
20 2.4
30 3.6
40 4.8
50 6.0
60 7.2
70 8.4
80 9.6
90 10.8
100 12.0
Overload Trip Current (Values in Amps)
Switch Code
B C D
2.5 3.8 7.5
5.0 7.6 15.0
7.5 11.4 22.5
10.0 15.2 30.0
12.5 19.0 37.5
15.0 22.8 45.0
17.5 26.6 52.5
20.0 30.4 60.0
22.5 34.2 67.5
25.0 38.0 75.0
E F G
10.4 15.5 30.0
20.8 31.0 60.0
31.2 46.5 90.0
41.6 62.0 120.0
52.0 77.5 150.0
62.4 93.0 180.0
72.8 108.5 210.0
83.2 124.0 240.0
93.6 139.5 270.0
104.0 155.0 300.0
23
H
48.8
97.6
146.4
195.2
244.0
292.8
341.6
390.4
439.2
488.0
Installation