Siemens SED2 VFD User Manual

SED2 VFD Electronic Bypass Option Operating Instructions
Contactors
The Controller board provides two or three relay contact circuits controlled by the Electronic
Bypass Option: bypass, input, and output contactors. Each circuit includes a NO relay. Controller
board connector J7 enables circuit connections. The relay circuits route power to the SED2 and
the motor via the contactors. Controlling the contactors through the relay circuits is the main
function of the Controller board.
Bypass Contactor – The bypass relay on the Controller board controls the bypass contactor.
The output and bypass relays are interconnected to 120 Vac Hot. This enables a safety circuit
that prevents the bypass and output contactors from simultaneously being energized.
Output Contactor – The output relay on the Controller board controls the output contactor.
Input Contactor – The input relay on the Controller board controls the optional input contactor.
Keypad Functions
Bypass
STOP
RESET
Enable
Input
Contactor
Output
Contactor
Bypass
Contactor
Overload
Relay
VFD
Hand
Start
Remote
Start
INTERLOCK START LOGIC
Enable Commanded Proofed
Auto Bypass Enabled
Essential Services
VFD Fault
Safety Fault
Overload Fault
Motor
VFD0096R1
2-CONTACTOR KEYPAD
VFD Bypass
STOP
RESET
Input
On/Off
Enable
Input
Contactor
Output
Contactor
Bypass
Contactor
Overload
Relay
VFD
Hand
Start
Remote
Start
INTERLOCK START LOGIC
Enable Commanded Proofed
Auto Bypass Enabled
Essential Services
VFD Fault
Safety Fault
Overload Fault
Motor
VFD0097R1
3-CONTACTOR KEYPAD
Figure 4. Electronic Bypass Option Keypad Indicators and Pushbuttons.
The keypad provides user interface indicators and pushbuttons. The following table describes
specific pushbutton and indicator functions:
Pushbutton/Indicator Description
Input
On/Off
VFD0098R1
The Input On/Off pushbutton is supplied with the optional drive input
contactor. In VFD mode, this switch does nothing. In bypass mode, this
switch closes/opens the input contactor, switching the SED2 power on/off.
Enable
VFD0099R1
Enables SED2 operation by closing the input and output contactors.
Hand
Start
VFD0100R1
Manually enables bypass mode operation by ensuring that the output
contactor is open and then closing the bypass contactor.
Remote
Start
VFD0101R1
Activates the bypass mode and operates the bypass contactor according
to the status of the Remote Start input on the Controller board.
6 Siemens Building Technologies

Siemens SED2 VFD Specifications

General

Brand	Siemens
Model	SED2 VFD
Category	DC Drives
Language	English