Yaskawa Electric America Inc.
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The E7L HVAC-specific AC drive/bypass system capabilities allow the motor to be operated from either the E7 drive or at full speed, directly across the line. Its extensive parameter selection allows BAS applications to be managed for without consuming building automation system points.
The unit uses built-in program storage and copying features for set-up. Equipped with a touchpad to select hand/off/auto, drive, bypass, drive test and manual speed control. The touchpad also features 11 LED indicators for indication of system operation.
Control logic provides industry-standard safety circuit interlocks in both drive and bypass operating modes. Bypass components include a fused 120 VAC control circuit transformer, motor overload relay, transfer switches and LED indicators.
The unit features embedded communications for building automation system protocols including Johnson Controls Metasys N2, Siemens APOGEE FLN, and Modbus. An optional LonWorks interface card is also available.
Optional software allows upload/download, as well as graphing and monitoring of drive parameters from a PC. User parameter settings can be recovered at any time via the user re-initialization function.
The drive/bypass system features inputs for safety interlocks, auto run/stop, BAS/damper, remote transfer, smoke purge, 0-10vdc or 4-20ma speed signal and an RS-422/485 communication port. Outputs include two programmable analog, either 0-10vdc or 4-20ma, a Form A motor run relay and three programmable Form C relays, all rated at 250V, 1 Amp.
Built-in PI maintains set point for closed loop control of fans and pumps for pressure, flow or temperature regulation and eliminates the need for closed loop output BAS signals. PI includes feedback display, inverse, square root and differential control functions.
The E7L drive/bypass is available in NEMA 1 and NEMA 12 enclosures in ratings to 60 HP. It conforms to CE, UL and CUL requirements.
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posted: 3/1/2007
