Ecb Safety Interlock - Trane TR200 Operating Instructions Manual

Electronically Controlled Bypass (ECB) Oper-
ation
Operation
Overloads and motors are both rated by class. The class is defined by the NEC to determine the maximum time
to trip. A Class 20 overload, for example, has a typical trip delay of 20 seconds or less at 600% current and normal
operating temperature. This allows for high motor inrush current for 20 seconds while the motor is ramping up
to synchronous speed. The trip time, however, is based on the percentage of overload. The higher the overload,
the shorter the time.
TRIP
TEST
98NO 95NC
97NO
T2
T1
Illustration 6.3: Sample Overload Device
Overload Function Setup
• Set the overload current dial to the FLA of the motor. DO NOT add the service factor of the motor into
the setting. A service factor of 1.2 x FLA is designed into the overload.
• Pressing the test pushbutton verifies the operation of the overload. The overload should trip when
pressed. Use the reset pushbutton to reset the overload after test.
• Reset is used to reset the overload after it trips. If the overload is still hot, wait until the motor reaches
normal operating temperature before resetting. The overload offers a manual (hand) or auto reset
selection. It is highly recommended to operate in the manual factory setting to prevent the risk of
damage to the motor.

ECB Safety Interlock

General Information
The safety interlock feature prevents the drive or bypass from operating. Only a fire mode command to run
overrides this function. For operation in drive or bypass mode, the safety external interlock input contact must
be closed. External inputs include, but are not limited to, high and low pressure limit switches, fire alarm, smoke
alarm, high and low temperature switches, and vibration sensors.
Operation
When an external safety input closes on ECB terminals 1 and 2 on connector X57, the option panel is in opera-
tional mode. When open, power to the motor is disabled. The bypass ignores all run commands except for fire
mode operation, when applicable. The drive display indicates alarm 221, bypass interlock, meaning the problem
is external to the drive. A factory installed jumper between X57 terminals 1 and 2 allows the unit to operate
when no safety input is connected. This jumper must be removed when connecting in a safety interlock circuit.
Safety Interlock Function Setup
• Remove factory-installed jumper between ECB connector X57 terminals 1 and 2 on drive control termi-
nals.
• Wire safety input to connector X57 terminals 1 and 2.
• For technicians familiar with connecting to drive terminals 12 and 27 for safety interlock, be aware that
ECB bypass operation will NOT stop with the external fault report. Use terminals 1 and 2 on connector
X57, as indicated, for bypass control.
52
MANUAL
AUTO
RESET
96NC
T3
TR200 Option Panel Operating Instructions