Electromechanical Bypass (EMB2) Operation
5 Electromechanical Bypass (EMB2) Operation
5.1.1 Typical Control Connections for Common HVAC Applications
Drive Terminal | Parameter Number | Parameter Name | Value Number | Value Name | Function |
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27 | 500 | Digital I/O Mode | 0 | PNP | External Interlock |
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27 | 501 | Term 27 mode | 0 | Input | External Interlock |
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29 | 502 | Term 29 Mode | 1 | Output | Auto Bypass |
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18 | 510 | Term 18 digital input | 8 | Start | Common run/stop |
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19 | 511 | Term 19 digital input | 52 | Run Permissive | Run Permissive |
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27 | 512 | Term 27 digital input | 7 | External Interlock | External Interlock |
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29 | 531 | Term 29 digital output | 160 | No Alarm | Auto Bypass |
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01 & 02 | 540 [0] | Relay 1 function | 167 | Start Command Active | Run Permissive |
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01 & 02 | 540 [0] | Relay 1 off delay | 0.00 seconds | Off Delay | Run Permissive |
Table 5.1 EMB2 Default Parameter Settings for Common HVAC Applications
If the drive is reinitialized, be sure that these settings are maintained or reset for proper bypass.
Name | Function | Drive Terminals | EMB2 X59 | EMB2 X55 | |
Remote Drive Start (with common start/stop) | Input Command |
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| 3, | 4 |
Remote Drive Start (without common start/stop) | Input Command | 13, 18 |
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Motor Running on Drive | Output Status | 04, 05, 06 |
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Run Request (for run permissive) | Output Command |
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| 11, | 12 |
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Run Enable (for run permissive) | Input Command |
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| 1, | 2 |
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Safety Stop | Input Command |
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| 5, | 6 |
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Drive Fault | Output Status |
| 5, 6, 7 |
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Fire Mode | Input Command |
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| 7, | 8 |
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Drive Mode | Output Status |
| 1, 2 |
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Bypass Mode | Output Status |
| 3, 4 |
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Fire Mode | Output Status |
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| 9, 10 | |
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Table 5.2 Common Functions for Controlling Motor using Bypass and Typical Terminal Connections.
Commands enable drive functions. Status reports describe conditions, but do not enable a function.