Controller Board - Siemens SED2 VFD Operating Instructions Manual

Controller Board

The Controller board is the foundation of the SED2 Electronic Bypass Option. It controls
communications to and from the SED2, keypad, isolated digital inputs, relay/digital outputs, and
contactors (Figure 3).
SED2 INTERFACE
Supports two SED2 non-isolated, digital relay
outputs and three SED2 digital inputs. The
maximum current draw for a relay output is 2 mA and
the voltage between the digital output source and return
lines is 24V. The Controller board provides unregulated,
non-isolated 24V to power the SED2 digital inputs.
BASIC SANITY TEST INDICATOR
Provides indication of initialization and
normal operation.
KEYPAD INTERFACE
Supports inputs and outputs from the Electronic
Bypass Option keypad. The keypad provides
user interface indicators and push buttons.
FACTORY USE ONLY
Connector J8 is for factory use only.
DIGITAL INPUTS
Supports six isolated digital inputs for customer use.
The inputs require a contact closure capable of
providing a low impedance path at currents less
than 20 mA.
DIGITAL RELAY OUTPUTS
Supports six digital relay outputs for customer use.
Each relay has a maximum rating of 2A at 120 Vac.
OVERRIDE JUMPER
The Controller board DIP switches enable/disable
the Electronic Bypass Option features.
When the switch is ON the option is enabled;
when the switch is OFF the option is disabled.
Siemens Building Technologies, Inc.
DIP SWITCHES
Not used, factory test selector switch #2;
leave this switch OFF.
Not used, factory test selector switch #1;
leave this switch OFF.
Interlock selector switch; requires
SED2 programming.
Automatic Bypass selector switch;
requires SED2 programming.
Essential Services selector switch.
Figure 3. Controller Board Inputs and Outputs.
Electronic Bypass Option Overview
J4
CONTROLLER
BOARD
J3
MCU
J8
J2
J1
TRANSFORMER
J6
J7
CONTACTOR POWER
CONTROLS
F1
J5
5