Honeywell SmartVFD HVAC MR4, User Manual

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7.2.1 Technical information on control connections
Table 22. Technical information on basic I/O board
Basic I/O board
Terminal Signal Technical information
1
Reference output +10V, +3%; Maximum current 10 mA
2
Analogue input,
voltage or current
Analogue input channel 1
0- +10V (Ri = 200 k  )
4-20 mA (Ri =250  )
Resolution 0.1 %, accuracy ±1 %
Selection V/mA with dip-switches (see page 52)
3
Analogue input common (cur-
rent)
Differential input if not connected to ground;
Allows ±20V differential mode voltage to GND
4
Analogue input,
voltage or current
Analogue input channel 1
Defauit:4-20 mA (Ri =250  )
0-10 V (Ri=200k  )
Resolution 0.1 %, accuracy ±1 %
Selection V/mA with dip-switches (see page 52)
5
Analogue input common (cur-
rent)
Differential input if not connected to ground;
Allows 20V differential mode voltage to GND
6
24V aux. voltage
+24VDC, ±10%, max volt. ripple < 100mVrms; max. 250mA
Dimensioning: max. 1000mA/control box.
Short-circuit protected
7
I/O ground
Ground for reference and controls (connected internally to
frame ground through 1M  )
8
Digital input 1
Positive or negative logic
Ri = min. 5k 
18…30V = "1"
9
Digital input 2
10
Digital input 3
11
Common A for DIN1-DIN6
Digital inputs can be disconnected from ground, see chapter
6.1.2.2.
12
24V aux. voltage
+24VDC, ±10%, max volt. ripple < 100mVrms; max. 250mA
Dimensioning: max. 1000mA/control box.
Short-circuit protected
13
I/O ground
Ground for reference and controls (connected internally to
frame ground through 1M  )
14
Digital input 4
Positive or negative logic
Ri = min. 5k 
18…30V = "1"
15
Digital input 5
16
Digital input 6
17
Common A for DIN1-DIN6
Digital inputs can be disconnected from ground, see chapter
6.1.2.2.
18
Analogue signal (+output)
Analogue output channel 1, selection 0 -20mA,
load <500 
Default:0-20 mA
0-10V
Resolution 0.1 %, accuracy ±2 %
Selection V/mA with dip-switches (see page 52)
19
Analogue output common
30
24V auxiliary input voltage
Can be used as external power backup for the control unit
(and fieldbus)
A
RS485
Differential receiver/transmitter
Set bus termination with dip switches (see page 52)
B
RS485