Operating Instructions

Application Features (Electronic Bypass Only)
Manual Bypass Delay (P3.18.1, ID: 1818)
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Siemens Industry, Inc. BT300 Bypass Operator's Manual DPD01391
Building Technologies 2017-09-28
Manual Bypass Delay (P3.18.1, ID: 1818)
This parameter defines the delay when switching between Bypass and Drive manually.
Range: 1.0 to 30.0s,
Default: 1.0s (as soon as possible).
Auto Bypass
If the Bypass Wizard was used to configure the Siemens BT300 Bypass and the Auto
Bypass feature was enabled, then all required settings are automatically programmed.
The Bypass Wizard can be executed again to disable the Auto Bypass feature, if
desired.
The Auto Bypass feature enables the BT300 Drive to automatically initiate bypass
operation when a drive fault occurs.
The following occurs when Auto Bypass is initiated:
1. The BT300 Drive stops delivering power to the output.
2. The output contactor (M2) opens.
3. The bypass contactor (M1) closes.
NOTE:
1. All safety conditions must be met for bypass mode operation.
2. The Electronic Siemens BT300 Bypass returns to VFD mode of operation as soon
as the BT300 Drive relay output 2 (drive fault) opens.
Auto Bypass Enable (P3.18.2, ID: 1813)
This parameter defines whether or not the Automatic bypass functionality is activated.
When Auto bypass is enabled, flying start is automatically enabled.
0 = Disabled (Default)
1 = Enabled
Auto Bypass Faults (P3.18.3, ID: 1812)
This parameter defines the faults that will cause the drive to be bypassed
automatically. One or more check boxes can be selected.
0 = Any fault (Default)
1 = Under-voltage
2 = Over-voltage
4 = Over-current
8 = Analog input low
16 = Unit temperature
32 = Motor Over temperature
64 = External fault
128 = Underload