Trane TR200 Bypass Status Word Bit Examples, ECB Auto Bypass, Electronically Controlled B

Electronically Controlled B...

6.1.7 Bypass Status Word Bit Examples

1.Motor running and bypass in drive mode. Status word 22 hexadecimal converts to 00000100010 binary.

Bit	10	9	8	7	6	5	4	3	2	1	0
Binary	0	0	0	0	0	1	0	0	0	1	0

1.External interlock fault (open) and bypass in bypass mode. Status word 208 hexadecimal converts to 01000001000 binary.

Bit	10	9	8	7	6	5	4	3	2	1	0
Binary	0	1	0	0	0	0	0	1	0	0	0

6.1.8 ECB Auto Bypass

General Information

Auto bypass allows a fault condition in the drive to activate running the motor in bypass without operator intervention. Activation of the function is through setting timer start parameters in the drive programming. Fault trip and running in bypass are reported through the drive display, digital outputs, and serial communications. In addition, the independently powered ECB card is available to report bypass status when the drive is inoperable (control card operative) through its serial communications or digital outputs.

Prior to Enabling Auto Bypass

•Complete the start-up procedure to verify motor rotation direction in bypass is correct and that the system is ready in all respects for continuous full speed operation in bypass.

Operation

•With the auto bypass function enabled, a fault signal from the drive activates the auto bypass timer.

•If the fault clears before the time delay is complete, the motor remains operating in drive mode. This allows temporary faults, such as a momentary under or over voltage, to clear without transferring the system to bypass.

•If the timer completes its cycle before the fault clears, the panel trips into bypass mode and the motor runs at constant full speed from line input voltage.

•In bypass, the motor will stop:

-if the drive receives a remote stop command

-local stop ([Off]) on the keypad is pressed

-a remote start command is removed

-a safety is open

-motor overload is tripped

•Once auto bypass is activated, the only way to reset the unit back to drive mode is by operator intervention. Ensure that the fault has been cleared, then press [Drive Bypass] and select drive mode.

Auto Bypass Function Setup

Enable auto bypass by changing parameters in group 31 in the drive extended menu.

•31-01, Bypass start time delay. Setting the timer at anything other than 0 time activates start delay in bypass. Leave at 30 sec. default or set as desired up to 60 sec.

•31-02, Bypass trip time delay. Setting the timer at anything other than 0 time activates auto bypass. Leave at 5 sec. default or set as desired up to 60 sec.

Figure 6.3 Bypass Trip Time Delay

130BX243

6-10 BAS-SVX49A-EN