Emb Switches - Trane TR200 Operating Instructions Manual

Electromechanical Bypass (EMB) Operation
Operation
For the EMB2, fault reporting is monitored through a Form-C relay (RL2) on the bypass control board. The relay
reports a fault on connector X56 terminals 7, 8, and 9. In normal operation, the relay is powered and terminal 7
is closed with terminal 9 open. In a fault condition, power to the relay is lost and the relay positions automatically
reverse, signaling the fault condition. Terminal 8 is the common to both. For the EMB(0) or EMB1, drive terminals
1 (common), 2 and 3 report faults with 2 open and 3 closed in the fault condition.
Fault Reporting Function Setup
• For EMB2, fault reporting status is connected to connector X56, output terminals 7, 8, and 9.
• For EMB(0) or EMB1, fault reporting status is connected to drive output terminals 1, 2, and 3.

EMB Switches

Bypass selector switch.The bypass selector switch is used for either the 2- contactor or 3-contactor bypass.
• 2-contactor bypass.A panelmounted Drive/OFF/Bypass selector switch is used to electrically select
whether the motor is driven by the drive (M2 contactor), connected to the full-speed bypass (M3
contactor), or disconnected from both. See figure below.
• 3-contactor bypass.A panelmounted Drive/OFF/Bypass/Test selector switch is used to electrically select
whether the motor is controlled by the drive (M1 and M2 contactors), connected to the full-speed
bypass (M3 contactor), or disconnected from both. The test position allows for operation in bypass
while still providing power to the drive (M1 and M3). See figure below.
Illustration 5.6: Basic 3-contactor Bypass Functions
38 TR200 Option Panel Operating Instructions