ABB ACH 400 User Manual page 37

Chapter 3 – Installation Instructions
Connection Points
Basic Connections
Additional Connections
3-18
Control wiring is connected to terminal block X1 on the ACH 400 control
board and to terminal block X2 on the Electronic Bypass control board.
Figure 3-1 shows the location of X2. Refer to the ACH 400 User's Manual for
the location of X1. X1 accepts one wire per terminal in wire sizes ranging
from 22 AWG to 16 AWG and X2 accepts one wire per terminal in wire sizes
ranging from 26 AWG to 14 AWG. Up to three wires per terminal can be
connected with a proportional reduction in maximum wire size. The control
terminals should be tightened to 13 inch - lbs. of torque.
Figure 3-4 shows the basic control connections for use with the HVAC macro.
These connections are described in the following paragraphs.
Analog inputs and outputs and additional digital input connections are
available on Terminal Block X1 inside the ACH 400. Note that the Electronic
Bypass control circuitry uses inputs and outputs DI1, DI2, RO1 and RO2.
These inputs and outputs are not available for any other purpose and must not
be reconfigured. AI1, AI2, AO1, DI 3, DI4 and DI5 are available for use.
Refer to the ACH 400 User's Manual for information about control
connections on Terminal Block X1. When making connections to Terminal
Block X1, be careful not to disturb the factory installed wiring between
ACH 400 terminal block X1 and Electronic Bypass control board terminal
X2.
X1
1 Terminal for signal cable shield
Auto Speed
+
Reference 2 Analog input Channel 1
3 Analog Input Common
4 10 V/10 mA reference voltage for potentiometer
X2
1 Auto Start input - Close to run
2 Enable input - Close to Enable
3 Mode input - Close to select Bypass mode
4 Pre-wired +24VDC for digital inputs
5
:
9
10 Common for digital inputs - also pre-wired to ACH 400
11
12
13 Common for digital inputs - also pre-wired to ACH 400
14
15
16
17
18
Motor Run
19
output
20
21
22
23
24
25
26
27
28
Figure 3-4 Basic Control Connections for HVAC Hand-Auto Macro
Terminals on the ACH 400 Control Board
Terminals on the Electronic Bypass Control Board
Pre-wired connections to ACH 400 terminal block X1
Do Not Disturb
Pre-wired connections to ACH 400 terminal block X1
Do Not Disturb
Drive Fault - Energized when the drive is
energized and not faulted
Drive Run - Energized when the motor is
running on the drive
Internally jumpered to:
Bypass Run - Energized when the motor is
running in bypass
Bypass Fault - Energized when the bypass is
energized and not faulted and the overload
protection is reset
Pre-wired connections to ACH 400 terminal
Do Not Disturb
ACH 400 with Electronic Bypass User's Manual
block X1