ABB PQFS Installation, Operation And Maintenance Instructions page 68

Note that in a multi-unit filter system in which more than one master system is present,
the digital inputs of all masters have to be set up and cabled in the same way to obtain
full redundancy.
Two connection approaches exist:
−
The first approach is to use one digital input for the start function and the second
digital input for the stop function.
input considered and the resulting effect when applying voltage to this input.
Table 30: Filter behavior as a function of the PQF-Manager settings for local start/stop and
PQF-Manager setup for
digital input
Edge ON
Edge OFF
Remark: Vlow = 0 Vdc, Vhigh = 15-24 Vdc
When using the Edge ON function the filter can only be switched on by applying
voltage to the digital input considered. It is therefore recommended in that case
to configure and cable the second digital input as Edge OFF. Refer to
7.9.1.4
function required.
The electrical requirements of the digital inputs are as discussed in
Figure 47
digital input and a stop function on the second digital input.
24 Vdc
external
supply
- +
Remark:
(a) Left hand terminal block when looking from rear, counting from top to bottom
Figure 47: Cabling diagram for implementing start on digital input 1 and stop
68 Electrical design and installation  Manual Power Quality Filter PQFS
using 2 digital inputs
Vlow applied to digital
input
No effect
No effect
for guidelines on how to set up the digital inputs according to the
shows a cabling diagram for implementing a start function on the first
External
External
start
stop
push
push
Table 30 shows the PQF-Manager setup for the
Vhigh applied to digital input
Filter starts on rising edge
Filter stops on rising edge
PQF-Manager
(a)
1
(a)
2
(a)
3
4 (a)
on digital input 2
Section
Digital input 1 (15-24Vdc)
Digital input 2 (15-24Vdc)
Section
4.5.