Basic Documentation

Siemens Building Technologies, Inc. Page 7 of 9
Document No. A6V10431169
(in amps), % torque, power (kW), relay outputs, digital inputs and diagnostic warning and fault information. Additionally,
remote (LAN) VFD fault reset shall be possible. A minimum of 15 field parameters shall be capable of being monitored.
Optional Features
Optional features shall be furnished and mounted by the drive manufacturer. All optional features shall be UL Listed by the
drive manufacturer as a complete assembly and carry a UL508 label.
Bypass
• Bypass shall be furnished and mounted by the drive manufacturer as defined on the VFD schedule. All VFD with
bypass configurations shall be UL Listed as a complete assembly and carry a UL508 label.
• A complete factory wired and tested bypass system consisting of an output and bypass contactors along with a
mechanical service switch to isolate the drive from the circuit. A door interlocked, padlockable circuit breaker or
optional fused disconnect shall be standard.
• The bypass enclosure door and VFD enclosure must be mechanically interlocked such that the disconnecting
device must be in the “off” position before either enclosure may be accessed.
• The VFD and bypass package with a fused disconnect shall have a UL listed short circuit rating (SCCR) of 100,000
Amps and this rating shall be indicated on the UL data label.
• Serial communications – the bypass shall be capable of being monitored and/or controlled using serial
communications. On-board communications protocols shall include ModBus RTU; ModBus TCP; BACnet MS/TP;
BACnet IP; Siemens Industry, Inc. FLN (P1); AND Johnson Controls N2.
• The bypass control shall include a programmable time delay for bypass start and keypad indication that this time
delay is in process.
• There shall be a keypad adjustment to select manual or automatic transfer bypass.
• The digital inputs for the system shall accept 24 Vac or 24 Vdc. The bypass shall incorporate an internally sourced
power supply and not require an external control power source.
• There shall be a run permissive circuit for damper or valve control.
• There shall be a list of conditions which the user can determine when the drive will automatically transfer to
bypass operation.
• Each bypass enclosure shall incorporate a diagnostic board for troubleshooting the bypass components.
• Electronic bypass must incorporate an electronic override capability to allow the bypass to run in the event of a
catastrophic failure of the control system. The drive will run in bypass and still maintain all safeties.
• Both Local and Remote bypass control shall be provided. When remote bypass is enabled, the bridling automation
system will be able to start and stop the motor for such things as night time shut down. .
• The bypass package shall include the ability for the user to enable interlocked start features that will not allow the
motor to run in drive hand, drive auto or bypass until a confirming end switch has been closed.
• User selectable auto bypass feature based on a drive relay shall be included. This will allow the user to have the
motor operated in bypass mode when the drive faults or for purposes selected by the user through
parameterization.