ABB ACH 400 User Manual page 38

Chapter 3 – Installation Instructions
Analog Input
The one analog input is usually used with the HVAC macro. The customer's
external Auto Speed Reference is connected to ACH 400 terminals X1:2(+)
and X1:3(-).
The analog inputs can accept a voltage signal (0 – 10 VDC) or a current signal
(0 – 20 mA). Jumper J1, located on the ACH 400 control board (J1 is used for
both AI1 and AI2), determines the signal type. J1 can be set in either the
voltage or current position according to the type of external signal that will be
connected. Place the jumpers in the appropriate positions for voltage or
current. Figure 3-5 shows jumper positions. The shaded areas represent
jumper positioning.
Figure 3-5 ACH 400 J1 Positions
Auto Start Input Contact
To start the ACH 400 by dry contact (maintained), connect the contact
between bypass terminals X2:1 and X2:10 or X2:13. Closing this contact will
start the motor when the drive or bypass is in the Auto mode.
Caution: There are pre-wired connections on bypass terminals X2:10 and
X2:13. Do not disturb these connections when adding external wiring
connections to these terminals.
Run Enable Interlock
Run Enable interlocks, such as Freeze, Fire, and Smoke protection are
Input Contacts normally closed dry contacts connected in series between bypass terminals
X2:2 and X2:10 or X2:13. When any of these contacts opens, the motor will
stop, whether in DRIVE or BYPASS.
Caution: There are pre-wired connections on bypass terminals X2:10 and
X2:13. Do not disturb these connections when adding external wiring
connections to these terminals.
Mode Input Contact
If the Mode input contact is closed, the motor switches to the Bypass mode
and does not respond to the Drive and Bypass keys. When the Mode input
contact is switched from closed to open, the bypass switches to the Drive
mode and can be controlled using the Drive and Bypass keys.
Connect the Mode contact between bypass terminals X2:3 and X2:10 or
X2:13.
ACH 400 with Electronic Bypass User's Manual 3-19