By340_04b_oi_e.doc / Apr-16
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11.
Appendix for model BY 641
11.1.
Relay Outputs
While model BY340 provides high-speed transistor outputs only, model BY641 provides four
additional relay outputs, operating in parallel to the high-speed transistor outputs K1 – K4.
All electrical connections of BY641 are fully similar to BY340, except that with BY641 models
the back plane is equipped with four additional terminal strips (3 positions each).
2 3
1
5 6
4
8 9
7
11 12
10
X3
K
4-
C
K
4-
N
O
K
4-
N
C
K
3-
C
K
3-
N
O
K
3-
N
C
K
2-
C
K
2-
N
O
K
2-
N
C
K
1-
C
K
1-
N
O
K
1-
N
C
REL.4
REL.3
REL.2
REL. 1
C =
NO =
Common contact
NC =
Normally open
Normally closed
Relay connector with units after Jan, 2009
2
3
1
2 3
1
2
3
1
2 3
1
K
4
-C
K
4
-N
O
K
4
-N
C
K
3
-C
K
3
-N
O
K
3
-N
C
K
2
-C
K
2
-N
O
K
2
-N
C
K
1
-C
K
1
-N
O
K
1
-N
C
X6
X5
X4
X3
Relay connector with units before Jan, 2009
(replaced because of mistakable screw terminals)
11.2.
Front Thumbwheel Switches
Moreover, the BY641 models provide thumbwheel switches on the front panel, for simple and
easy setting of the speed ratio by means of Factor1.
This is how the front switches work:
Upon power-up the unit will read the thumbwheel settings and overwrite the internal
Factor 1 setting correspondingly, i.e. the synchronization will use the front
thumbwheels.
When during operation you change the thumbwheel setting, this will not affect the
synchronization until you apply a “Read Thumbwheel” command to the unit. You can
assign this command to either one of the front keys or to one of the Control Inputs, as
shown under sections
8.2.6
and
8.2.7
When the front thumbwheels are all set to zero, the controller will automatically use the
internal Factor 1 as entered by menu.
