substitution request - Alliance Construction Solutions

2.06 BYPASS PANEL:
9. Provide with the VFD a Lonworks or Bacnet type communication card and required
interface components and software necessary to forward VFD data information to
and from the BAS/VFD.
A. The fixed speed bypass panel shall be mounted and wired in a compartment separated
from the VFD, and shall allow constant speed operation of the controlled motor while the
VFD is out of service. Both VFD and bypass components shall be mounted in a single
NEMA 1 enclosure with terminals for field connection to the three-phase power, the
controlled motor, and the temperature control interface.
1. Cabinet door(s) where either door dimension is greater than 30" shall be
constructed of 14-gauge or heavier steel with at least three hinges and one lock
per door.
2. VFD and bypass manual control and programming devices shall be doormounted
or accessible without opening main door.
3. The prewired bypass panel compartment shall include:
Project No.: 10145
550 15 th Street Dual Brand Hotel
03/16/2012
a. A VFD output contactor and a constant speed bypass contactor.
b. A three-pole thermal motor overload relay with heaters connected to shut
down the motor in both the VFD and bypass modes.
c. A door-interlocked VFD disconnect switch, circuit breaker or contactor
which shall allow power-off maintenance of the VFD while the motor
operates in bypass mode, with a full sheet metal barrier between the
bypass and VFD compartments. Bypass circuitry in the same
compartment as the VFD will not be allowed, and an input contactor to
the VFD will not be considered equal to the VFD disconnect switch
specified. This disconnect is in addition to the fused disconnect for the
entire unit, specified previously in para. 2.05, E-1.
d. A 120-volt control power transformer with fused secondary.
e. Control relays or control logic as necessary to allow for remote start/stop,
and remote safety interlocks.
f. An interlock to allow a controlled VFD deceleration ramp to stop.
g. An adjustable delay function (1 to 30 seconds) to prevent rapid switching
between bypass and VFD modes.
4. A manual selector switch shall provide for the following operating mode:
2.07 EQUIPMENT FABRICATION:
a. A manual “VFD-OFF-BYPASS” control selector switch shall be provided on
the bypass compartment door. In VFD mode, the output of the VFD shall
be connected to the motor, allowing variable speed operation. OFF shall
inhibit all motor operation. BYPASS shall start the motor across the line.
A. General: Fabricate mechanical equipment for secure mounting of motors and other
electrical items included in work. Provide either permanent alignment of motors with
equipment, or adjustable mountings as applicable for belt drives, special couplings and
similar indirect coupling of equipment. Provide safe, secure, durable, and removable
guards for motor drives, arranged to allow for lubrication and similar runningmaintenance
without removal of guards.
23 0513 - 10 MECHANICAL/ELECTRICAL REQ.
FOR MECHANICAL EQUIPMENT