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5.4.3 – ‘Auto Features’ Menu (continued)
Auto Bypass
Range: P18 / B2 Default: On Scaling: n/a Type: R/W
‘Auto Bypass’ turns ‘On’ and ‘Off’ the automatic detection of a bypass contactor. When ‘On’, a
bypass contactor will be automatically detected. Soft-starter thyristor trips and thyristor short-
circuit trips will be disabled during Run (after full voltage is reached). Thyristor protection and
thyristor short-circuit protection are still available during the start ramp, and phase-loss protection
is available during both Start and Run.
Auto 3MC
Range: P18 / B1 Default: On Scaling: n/a Type: R/W
‘Auto 3MC’ turns ‘On’ and ‘Off’ the automatic removal of the low voltage ramp for high pedestal
starts.
‘Auto 3MC’ applies only to ‘Start Pedestal’ voltages set above 50% (P-11 or P-79). The SR44
normally does a very brief low-voltage ramp up to the pedestal voltage level before the start ramp
begins, but ‘Auto 3MC’ applies a higher starting torque and eliminates this initial pedestal ramp for
pedestal voltages above 50%.
Auto Ramp
Range: P18 / B0 Default: Off Scaling: n/a Type: R/W
‘Auto Ramp’ automatically detects motor acceleration and dynamically adjusts the ramp to give
smoother acceleration. This menu item works in conjunction with the Start Time parameter (P12),
which should be set to the estimated start time of the load. This would be suitable for starts with
varying loads.
Auto All –> OFF
Range: n/a Default: n/a
‘Auto All –> OFF’ turns ‘Off’ all the ‘Auto’ options (all options contained in this submenu except
‘Stop Smoothing’). The only action of this menu item is to turn ‘Off‘ these ‘Auto’ options when the
menu item is activated.
P122 Stop Smooth
Range: P121 / B1 Default: Off Scaling: n/a Type: R/W
‘Auto Soft Stop Smoothing’ (P121 / B1) turns ‘On’ and ‘Off’ the ‘Stop Smoothing’ function (P122).
When turned ‘On’, this menu item attempts to eliminate any oscillations that may occur when the
unit Soft Stops with an unstable load.
(P18.B2)
(P18.B1)
–
(P18.B0)
(P122.B1)
Auto Bypass detects the presence of a bypass contactor, and should be ON when using one.
Using a bypass contactor with Auto Bypass in the OFF state can cause thyristor faults.
An external user-supplied current transformer is required if any of the current or power related
trip or monitoring features are needed in bypass mode.
(Parameters: 8/B2, 9/B1/B2, 20, 21, 22, 23, 26, 28, 30, 32, 33, 34, 36, 39,
51/B1/B2/B3/B4, 87, 89, 91, 93, 112/B0/B1/B2/B3/B6, 121/B4)
Refer to Electrical Installation Chapter 2, subsections 2.4.1 & 2.5.2 for wiring information.
Chapter 5: Keypad Menu Items and Parameters
SR44 Series Soft Starter User Manual
1st Ed, Rev B 07/31/2019