Operating Instructions

Operation (Electronic Bypass Only)
Bypass
-
Specific Parameters
31
Siemens Industry, Inc. BT300 Bypass Operator's Manual DPD01391
Building Technologies 2017-09-28
Bypass-Specific Parameters
The Bypass settings can only be accessed if Bypass (P3.17.4) is set to Electronic. The
best way to set this parameter is by executing the Bypass Wizard (P1.21). The bypass
settings contain specific information about the Electronic Bypass configuration. These
settings are presented in the following table:
Table 3: Bypass Settings.
Structure Parameter Unit Min Max Default ID Description
P3.18.1 Bypass Delay s 1 30 1 1818 Defines the time from when the bypass is
activated until the M1 (bypass) contactor
is pulled in, and the motor begins to spin.
P3.18.2 AutoBypass N/A Disabled Enabled Disabled 1813 Enable parameter to the Auto Bypass
feature. If enabled, when a selected fault
(as defined by AutoByp Faults [P3.18.3])
occurs, and the amount of time defined in
AutoBypass Delay (P3.18.4) has passed,
the unit automatically switches to Bypass
mode of operation. The M2 (Output)
contactor opens, the M1 (Bypass)
contactor closes, and line voltage
connects directly to the motor. The motor
spins at full speed.
P3.18.3 AutoByp Faults N/A N/A N/A N/A 1812 Defines the authorized faults for the Auto
Bypass feature to activate.
P3.18.4 AutoBypass Delay s 1 30 1 1817 Defines the delay time from when the
drive faults and the bypass is enabled.
P3.18.5 EssentServEnable N/A Disabled Enabled Disabled 1826 Enable parameter to the Essential
Services feature. If enabled, when
activated by Essential Services
(P3.5.1.52), an Essential Services Fault
(83) displays. This is a version of Fire
mode that uses bypass instead of the
drive for controlling the motor. The unit
will automatically switch to Bypass mode
of operation. The M2 (Output) contactor
will be opened, the M1 (Bypass)
contactor will be closed, and line voltage
will be connected directly to the motor.
Motor spins at full speed.
P3.18.6 RemoteBypEnable N/A Disabled Enabled Disabled 1828 Enable parameter to the Remote Bypass
feature. If enabled, when the unit is
placed in Bypass mode, the M1 (Bypass)
contactor opens/closes in accordance
with Rem. Ctrl. Place (P3.2.1).