EN
39
7 .6 External power supply
In order to ensure a stable power supply (>20.6 V) even at the last station in large systems
with several networked HOLDX process locks and long cable lengths, it may be necessary
to add an external power supply. This depends on the total number of participants and the
cable lengths used. Various examples are given in Tables 3 and 4.
An exact calculation, when on an external power supply is needed, can be carried out
with the software "HOLDX-Manager". You can find the software on the Internet at www.
safety-products.de.
For most applications, it is sufficient to add an external power supply from the 5th – par-
ticipant upwards.
7 .7 Cable for external power supply
Fig. 18:
Master
X1
X2
X1
X2
X1
X2
X1
X2
X2
X1
X1
X3
Pin 1 +24 V
+24 V
F1
+24 V
0 V
0 V
Pin 2 +24 V
Pin 3 0 V
Pin 4 0 V
X2
X1
X2
connector
plug*
Cable for
external power supply
cable type C *
Connection cable HOLDX
cable type B *
Connection cable
HOLDX - PLC
cable type A *
Connection cable
cable type D *
PELV power supply
Slave 1
Slave 2
Slave n
Slave n+1
Last Slave
Pin 7
Serial OUT
INPUT
OUTPUT
Pin 8
Serial Clock
OUT
Pin 5
Serial IN
(WH/GN)
Pin 6
Serial Clock IN
(BN/GN)
Standard PLC
Pin 2 OSSD1 OUT (BK)
Sicherheits-
auswertung
Pin 4 OSSD2 OUT (VT)
Safety PLC
safety relay
Pin 1 +24 V (BN/YE)
Pin 3 0 V (BU)
PELV power supply
+24 V
F1
0 V
Example of the networked connection and external power supply.
* The corresponding cables (cable type A, B, C and D) can be found under 11.1 Accessories.
Max. cable length PLC to HOLDX master:
20m
Max. number of HOLDX slaves:
29
HOLDX total
number
Cable length PLC
to HOLDX master
Total cable length between
HOLDX master and HOLDX slaves
Total cable
length
4 items
< 10 m 60 m (e.g. 58 m + 1 m + 1 m)
70 m
4 items
< 20 m 30 m (e.g. 28 m + 1 m + 1 m)
50 m
5 items
< 10 m 40 m (e.g. 37 m + 1 m + 1 m + 1 m)
50 m
5 items
< 20 m 10 m (e.g. 7 m + 1 m + 1 m + 1 m)
30 m
15 items
< 5 m 14 m (e.g. 14 m × 1 m)
19 m
Table 3: Guideline for of cable lengths and number of the units before the external power
supply
HOLDX total number
Total cable length
3 items
90 m
4 items
70 m
5 items
50 m
6 items
45 m
Table 4: Cable lengths and number of units after the external power supply
