Fireye PPC6000 Series Manual page 42

RS485
COMMS BUS
A+ B- 0V
PB11 PB12 PB13
NOTE: Due to differences in communications hardware, it
RS485 A (+) PB 5
RS485 B (-) PB 6
RS 485 GND PB 7
RS 485 ISOL A (+) PB 11
RS485 ISOL B (-) PB 12
RS485 ISOL GND PB 13
NOTE: Interposing terminal blocks should be avoided when shielded cable is required. Interposing
terminals present a risk of electrical noise interference resulting in unreliable operation.
2.6.19 Variable Speed Drive Selection:
The NX6100 may have an optional daughter board within the main enclosure to allow control of 1 or 2 inverter
drives. Optionally the daughter board is also available to allow feedback to be taken from directly from
encoders measuring the speed of the relevant motor, fan or pump shaft. There is also an option to allow the
cup speed of an additional rotary device, e.g. atomizing cup, to be monitored as an encoder input.
When not configured to control an inverter, the 4-20mA outputs may be configured to transmit system
variables as current outputs (4-20mA) such as modulation rate, steam pressure, etc.
There are special wiring requirements for inverter feedback. See Caution in Section 2.6.20.
: When selecting a VSD or variable frequency drive (VFD) consideration must be given to
Important note
the size and weight of the blower wheel. While a "fan" application is by nature a variable torque load, the
inertia (weight) of the blower wheel must be considered. Typical HVAC type drives do not speed up or slow
down large blower wheels with enough control to operate within the tolerance of the PPC or NX series control.
Therefore, a VSD (VFD) with some built in breaking capability, such as a constant torque drive, should be
used. At a minimum, if the drive has a constant torque setting, it must be enabled to minimize faults due to
drive hunting. Since VFD's are expected to perform as if they are servomotors, similar positional errors are
applied to VFD's. See Section 7.
Building Automation
CLAMP BAR
A+ B-
PB11 PB12
may be necessary to reverse the "A" and "B" wires.
For details on connecting PPC6000 series controls to a PC on the
communications bus, refer to the manual NX-1502 (Comfire2 combustion
analysis tool).
NOTE: Isolated RS485 (PB11 thru PB13) for use with Modbus / BAS
integration – Requires optional Daughter Board. See MOD-6101
for details.
CLAMP BAR
0V A+
PB13 PB11
42
B- 0V
CLAMP BAR
PB12 PB13
ISOLATE
TO BAS
VIA MODBUS
See Bulletin
MOD-6101