Electronically Controlled B...
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 sec. or less at 600% current and normal operating temperature. This allows for high motor inrush current for 20 sec. 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.
| 10 | TRIP |
| 130BX229.10 |
| 5 |
| MANUAL |
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TEST | 20 | 30 | AUTO |
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| RESET |
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97NO | 98NO | 95NC | 96NC |
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T1 |
| T2 | T3 |
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Figure 6.5 Sample Overload Device
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
•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.
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 testing.
•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.
6.1.11 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 operational mode. When open, power to the motor is disabled. The
6.1.12 ECB Common Run/Stop
General Information
The common run/stop function provides remote run and stop control of the motor while in either drive or bypass. Without common run/stop, the motor would automatically run at full speed whenever the bypass is activated. The remote signal provides drive control as well as bypass control, making this one input common to both. Common run/stop is enabled by factory default. When used with the run permissive function, common run/stop permits run request operation in bypass.
Operation
A user supplied remote run command wired to drive terminals 13 and 18 initiates remote drive or bypass operation. Common run/stop can also be activated by hand on the keypad or through serial communication. Operation in either drive or bypass is determined by drive or bypass mode selection, not the run/stop command.
Prior to Enabling Common Run/Stop
•Complete the
Common Run/Stop Setup
•Wire a remote run/stop to drive input terminals 13 and 18 (default run input). Ensure that parameter 18 is programmed for run (default setting).
