Hvac Terminals Typical Connection Diagram – Terminal Config 3 - Zener MSC-3 Instruction Manual

Control connections and configuration
HVAC Terminals Typical Connection Diagram – Terminal Config 3
General
This section shows the typical configuration applicable to pump and fan drives in the HVAC industry.
Typically these will be controlled from an external speed signal, frequently supplied from the output of
a building management system. Specific setup instructions are provided for the more common HVAC
applications in the sections that follow this.
i
The function of terminals
D1...4 are programmable. In
this configuration the following
functions are assigned to the
terminals:
I02 ~ STOP
I00 FWD & LATCH
I08 ESO
I11 REMOTE
+5V D1
1
Stop Run
Services Override
1
32
D1
D2
D3
D4
D2 D3 D4 EN COM
2 3 4 5 6 7
Essential
Local Remote
Optional
Optional Output Disable
Single direction
2 wire control
with ESO
2 3 4 5 6
Essential Services
Override
Power up start up
with ESO
i
Essential Services Override
(ESO)
See page 51 for detailed
information
MSC - 3 Control Board
RS-485 / EIA-485
SCN Vref IN+ IN -
Serial Communications
A
8 9 10 11 12
See page 43
for details
1k to 10k ohm
potentiometer
8 9 10 11 12
-
+
Input reference source
Optional Wiring
If selection between
local and remote is
not required, place a
link between terminals
1 and 5. If the output
disable is not required
place link between
terminals 1 and 6
IM00120 IM00120
RL1 RL2
B C
13 14 15 16 17 18
O No Power
O
Power On
and Stopped
C Power On
Drive
Running
RL1 - Run
No Power O
Power On O
and not
tripped
Power On, C
and drive
tripped
RL2 - Trip
Local / Remote
In "local" the MSC-3
is controlled from
the front panel
console. In "remote"
the MSC-3 is
controlled from the
terminal strip.