ABB ACS 400 User Manual page 117

Code Description
8117 NR OF AUX MOT
Sets the number of auxiliary motors.
Relay outputs
Start/stop signals for the auxiliary motors are given through relay outputs. In addition, one relay output is
used to connect the speed regulated motor to the ACS 400.
ACS 400 relay outputs RO1 and RO2 can be used to control the motors. It is also possible to use up to two
optional external digital input/output modules (NDIO).
ACS 400 relay output 1 is used for Pump and Fan motor control if 1401 RELAY OUTPUT 1 value is 29
(PFC). Relay output 2 is used for Pump and Fan motor control if 1402 RELAY OUTPUT 2 value is 29
(PFC).
Table 17 depicts the use of relay outputs for different settings of parameters 1401 and 1402. If Autochange
function is not used, first relay output configured for PFC use controls the speed regulated motor. If
Autochange function is used, the ACS 400 Autochange logic assigns the relay outputs to corresponding
motors (of which one is speed controlled).
Table 17
Usage of relay outputs. Relay output configuration is set by parameters 1401, 1402 and 8117.
Number of relay outputs needed depends on the number of auxiliary motors. For example, if number of
auxiliary motors is 2, total of three relay outputs (motors 1,2 and 3) are needed. x = Any other setting than
29 (PFC).
Parameter
setting
1401
RELAY RELAY
OUTPUT OUTPUT
1
29 (PFC) 29 (PFC)
29 (PFC) x
x 29 (PFC)
x x
8118 AUTOCHNG INTERV
Sets the interval for the Autochange function. The time is counted only when ACS 400 Start signal is on.
See parameter 8119
0.0 =
NOT SEL
This setting switches off the Autochange function.
Note! The ACS 400 always coasts to stop when autochange is performed.
Warning! If the Autochange function is used, the Interlocks must be in use. In Autochange system there is a
contactor between ACS 400 output terminals and the speed controlled motor. The contactor is damaged if
opened without first interrupting the ACS 400 inverter bridge switching. The inverter switching is interrupted
when the Interlock is switched off and the ACS 400 coasts to stop.
ACS 400 User's Manual
ACS 400 relays
1402 Relay
output
RO1
2 function
Motor 1 Motor 2
start/stop start/stop
Motor 1 e.g. Fault
start/stop
e.g. Fault Motor 1
start/stop
e.g. Run e.g. Fault
for information on the operation of the Autochange.
AUTOCHNG LEVEL
NDIO module 1
(Module node number
= 5)
Relay NDIO
output relay
RO2 output 1
function function
Motor 3
start/stop
Motor 2
start/stop
Motor 2
start/stop
Motor 1
start/stop
NDIO module 2
(Module node number =
NDIO
NDIO relay
relay
output 1
output 2
function
function
Motor 4 Not used
start/stop
Motor 3 Motor 4
start/stop start/stop
Motor 3 Motor 4
start/stop start/stop
Motor 2 Motor 3
start/stop start/stop
6)
NDIO relay
output 2
function
Not used
Not used
Not used
Motor 4
start/stop
107