Yaskawa E7B Drive Bypass - Manual (Page 21)

Physical Installation 1 - 9
Bypass Product Options
Option A - Two motor “AND” control: Allows the operation of two motors from one Drive or Bypass. Pump #1 “AND”
pump #2 are operated at the same speed via the output from one Drive or Bypass. The motors are always operated
simultaneously therefore, no transfer switch is involved. With the 2 motor “AND” option, motor OverLoad Relays and fuses
are provided for each motor and the Drive’s internal motor overload function is disabled.
The two motors can be of different capacity if this capacity difference was considered in the ordering process. The factory
needs to know the FLA value of each motor controlled in order to select the correct motor overload devices and fuses.
(Specifying different capacity motors results in longer, non-standard lead times).
Option D - Two motor “OR” control: A MTR #1/AUTO/MTR #2 selector switch is provided to allow local or remote motor
operation selection, between two identical motors, for control by either the Drive or the Bypass (for example, Pump #1 “OR”
AUTO “OR” Pump #2). In the AUTO position a contact closure from a BAS, at TB1 terminals 23 and 24, can switch between
the two motors. The two motors must be the same horsepower and current draw.
Option E - RFI/EMI Filter: Filters to further attenuate possible VFD generated noise. Radio frequency interference/electro
magnetic interference filters reduce conducted noise on the Drive input power leads and therefore, radiated noise from those
leads. This option is installed on the input power side of the Drive, between the input contactor and the Drive.
Option F - Drive Input Fuses: Fuses capable of protecting semiconductor devices, rated at 200 kAIC are connected to the line
side of the Drive, between the input contactor and the Drive, to protect the Drive semiconductors when motor or output
conductor short circuit faults occur.
Option J - Enable Embedded Serial Communications: A no cost option. The Drive in a Bypass unit is capable of network
communication via one of 3 embedded protocols. Specifying option J and the protocol to be employed (Metasys, APOGEE or
Modbus) will provide the necessary parameter settings and wiring (jumpers) to be network ready when delivered (Project
specific H5-0X parameters are setup by the user).
Option K - 5% Output Reactor: Employed on the output side of the Drive for reduction of peak voltages applied to the driven
motor. In long Drive to motor lead length situations, high carrier frequency and reflected waves can cause high voltage spikes
at the motor. An output reactor provides motor protection in these long motor lead length situations. This option is installed on
the output power side of the Drive, between the output contactor and the Drive.
Option L - Serial Communication, Echelon LonWorks: An isolated RS-422/485 circuit board provides LonTalk protocol for
network communication to a BAS. This option plugs into the CN2 connection on the Drive control circuit board.
Option M - 4 to 20 mA Output: Provides two programmable 0 to 10 VDC analog outputs or two programmable 4 to 20 mA
analog outputs.
Option N - Input Capacitive Network Radio Frequency Interference Filter: Electronic equipment can be sensitive to low levels
of voltage distortion and electrical noise. This passive wye-delta capacitve filter is intended for installation on the VFD input in
order to protect other sensitive electronic loads, it provides attenuation of conducted RFI and EMI.
Option P - Pressure to Electrical Transducer: This transducer is employed when converting a pneumatic signal to an electrical
signal for use as the Drive speed command input. The need for this option comes up on retrofit applications when the
pneumatic signal that formerly controlled the pneumatic actuator on Inlet Guide Vanes (IGV), for example, is now to be used
to control the fan speed via the Drive. This option is wired to Drive terminals +V, A2 and AC, parameters H3-10 and
H3-11 are used for final field calibration of this input if there is jobsite variation from the typical 3 to 15 PSIG pneumatic
signal input range.