Operating Instructions

SED2 VFD NEMA Type 3R/3RHE Bypass Operating Instructions
6 Siemens Building Technologies, Inc.
NEMA Type 3R/3RHE Bypass Operation
Overview
NOTE: See Figure 6 for NEMA Type 3R/3RHE Bypass control terminals.
• Drive Mode
− Drive output contactor closes (and drive input contactor if supplied). The motor is
controlled by the SED2 output.
− Change the position of the Drive-Off-Bypass switch to OFF or the bypass stops
the SED2 by opening digital input 4, stop 3.
• Local Bypass Operation
− Requires a jumper between bypass control terminals 7 and 8. Jumper is supplied
from the factory.
− The system goes to bypass by closing the bypass contactor. The bypass
indicating light illuminates whenever the Drive-Off-Bypass switch is placed in the
BYPASS position.
− The motor is connected to utility/line power.
• Remote Bypass Operation
− Requires a jumper between bypass control terminals 5 and 6.
− Requires that the Drive-Off-Bypass switch be in the BYPASS position.
− The system goes to bypass by closing the bypass contactor and the bypass
indicating light illuminates whenever bypass control terminals 1 and 2 are closed
(Customer Remote Start Input).
− The motor is connected to utility/line power.
• Automatic Bypass Operation
− Requires wiring a normally open (NO) contact from DR1 to terminals 9 and 10.
− Requires wiring a normally closed (NC) contact from DR1 to terminals 11 and 12.
− Requires programming of P0731=52.3 and P0748=
.
− Requires that the Drive-Off-Bypass switch be in the DRIVE position.
− The system goes to bypass by closing the bypass contactor and the bypass
indicating light illuminates whenever the drive registers a fault condition and
output relay No. 1 changes state.
− The motor is connected to utility/line power.