Siemens 125-3208 Application Feature Setup, Overview, Auto Bypass without Interlock, Description

SED2 VFD Electronic Bypass Option Operating Instructions

Application Feature Setup

Overview

The Controller board supports six isolated digital inputs and six digital relay outputs for customer use (Figure 13). The digital inputs include: Remote Start Input, Remote Safety #1 and #2, Interlock Start, Essential Services, and Overload Trigger. The digital outputs include:

•VFD Fault

•Programmable Output

•Drive Select

•Bypass Select

•Bypass Running

•Overload Fault

	Remote Start Input	1	J2
	Remote Safety #1	2
		3
	Remote Safety #2	4
DIGITAL		5
		6
INPUTS	Interlock Start
		7
	Essential Services	8
		9
	Overload Trigger	10
		11
		12

DIGITAL	Programmable Output, NO	13	J1
OUTPUTS	COM	14
	NC	15
	VFD Fault, NO	16
	COM	17
	NC	18
	Drive Select, COM	19
	NO	20
	Bypass Select, COM	21
	NO	22
VFD0114R2	Bypass Running, COM	23
	NO	24
	Overload Fault, COM	25
	NO	26

Figure 13. Controller Board Digital Inputs and Outputs.

Auto Bypass without Interlock

Description

The Auto Bypass feature enables the SED2 to initiate automatic bypass mode operation. Closing of the SED2 Relay sends the motor to hand bypass mode. See the SED2 VFD Startup, Operation, and Maintenance Manual (125-3201) for programming of this relay and for its desired action.

When the SED2 initiates bypass mode operation, the following occurs:

•The SED2 stops delivering power

•The output contactor opens.

•The bypass contactor closes and the Programmable Output on the Controller board closes.

42 Siemens Building Technologies, Inc.