CPC MultiFlex PAK, Руководство пользователя

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14 • MultiFlex I/O Board Operator’s Guide 026-1712 Rev 3 03-JAN-2008
4.3. The Analog and Digital
Outputs
4.3.1. Digital/Analog Output Types
Supported by the MultiFlex
PAK
4.3.2. The PAK Default Analog/Dig-
ital Output Assignments
The MultiFlex PAK board has four outputs
that may act as either digital outputs that pulse a
+8VDC signal, or as analog outputs that use a
variable voltage to drive a fan sequencer or
VSD. Each output is rated up to 10 milliamps.
These outputs are fixed to drive solid-state
relays for activation/deactiviation of condenser
fan stages.
For use as digital outputs, the MultiFlex
PAK may be configured in the software to define
0/8V as ON/OFF or as OFF/ON.
The PAK has no hardware-based fail-safe
settings (fail-safes are set up in the board firm-
ware). All that is required is to connect the “+”
terminal to the positive wire on the device and
the “-” terminal to the negative (or ground) wire
of the device.
Output Type Description
Comp Grp1-8 Compressor Group output 1-8
Fan Stage 1-4 Fan Stage output 1-4
Liq Inject Condenser Liquid Injection
valve
Cond Spray Condenser Spray valve
Alarm Compressor discharge temper-
ature sensors for compressors
#1 through #8
VSD Fan En-
able
"Run" input for an inverter oper-
ating the variable-speed fan(s)
VSD Bypass Bypass input for an inverter op-
erating the variable-speed
fan(s)
VSD Reset Reset input for an inverter oper-
ating the variable-speed fan(s)
VSD Analog Fan speed input for an inverter
operating the variable-speed
fan(s)
Fan Seq Variable-voltage output driving
a fan sequencer
Table 4-7 - MultiFlex PAK Output Types
Analog/Digital
Output #
Definition
1 Fan Stage 1
2 Fan Stage 2
3 Liquid Inject
4 Condenser Spray
Table 4-8 - MultiFlex PAK Default Outputs
Figure 4-4 - MultiFlex Digital Points
DIGIT
A
L