ABB ACH 400 User Manual page 39

Chapter 3 – Installation Instructions
Relay Contact Outputs
Wiring Practices
3-20
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.
Form C contacts of a Drive Fault relay are provided at bypass terminals
X2:14(NC), X2:15(NO) and X2:16(COM). The drive fault relay is energized
when the drive is energized and not faulted.
A Motor Run relay contact output is provided at terminals X2:18 and X2:19
for external indication of the motor status. The output consists of a normally
open Drive Run contact and a normally open Bypass Run contact. The two
contacts are connected in parallel so that a contact closure is provided
whenever the motor is running. The Drive Run and Bypass Run contacts can
be separated and used individually by cutting jumpers R63 and R64 on the
bypass control board. See Figure 4-1 on page 4-2 in Chapter 4.
Form C contacts of a Bypass Fault relay are provided at bypass terminals
X2:23(NC), X2:24(NO) and X2:25(COM). The Bypass Fault relay is
energized when the bypass is energized and not faulted and the overload
protection is reset.
Form C contacts of a Mode relay are pre-wired connections on bypass
terminals X2:26(NC), X2:27(NO) and X2:28(COM). Do NOT disturb these
connections. The Mode relay is energized when the bypass is in the Drive
mode and deenergized when the bypass is in the Bypass mode.
Relay contact ratings:
Maximum Voltage: 30 VDC / 125 VAC
Maximum Switching Current: 8 A at 24 VDC, 0.4 A at 125 VAC
Maximum Continuous Current: 2 A rms
If the relay contacts are used to control inductive loads, such as the coils of
relays or contactors, some form of noise suppression must be provided at the
load. This is to reduce the electrical noise that could interfere with the
electronics in the drive, as well as increase the life of the contacts in the relay.
DC coils should be suppressed with a diode, although this is not required
because of the small amount of noise generated by these type of circuits. If a
diode is used, it should have a voltage rating greater than or equal to the
supply voltage rating.
The external control wiring to X1 and X2 must not be run in the same conduit
or raceway with any high power wiring. The external speed reference signal
must be wired using a twisted pair shielded cable. The shield connection must
be terminated at the ground terminal provided (X1:1). The other end of the
shield should be cut and taped back at the signal source.
ACH 400 with Electronic Bypass User's Manual