Chapter 3 – Installation Instructions
3-18 ACH 400 with Electronic Bypass User’s Manual
Connection Points 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.
Basic Connections Figure 3-4 shows the basic control connections for use with the HVAC macro.
These connections are described in the following paragraphs.
Additional Connections 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.
Figure 3-4 Basic Control Connections for HVAC Hand-Auto Macro
X1 Terminals on the ACH 400 Control Board
Auto Speed
Reference
1 Terminal for signal cable shield
2 Analog input Channel 1
3 Analog Input Common
4 10 V/10 mA reference voltage for potentiometer
X2 Terminals on the Electronic Bypass Control Board
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
Pre-wired connections to ACH 400 terminal block X1
Do Not Disturb
10 Common for digital inputs - also pre-wired to ACH 400
11 Pre-wired connections to ACH 400 terminal block X1
Do Not Disturb12
13 Common for digital inputs - also pre-wired to ACH 400
14
Drive Fault - Energized when the drive is
energized and not faulted
15
16
Motor Run
output
17
Drive Run - Energized when the motor is
running on the drive
Internally jumpered to:
Bypass Run - Energized when the motor is
running in bypass
18
19
20
21
22
23 Bypass Fault - Energized when the bypass is
energized and not faulted and the overload
protection is reset
24
25
26 Pre-wired connections to ACH 400 terminal
block X1
Do Not Disturb
27
28
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