Hach-Lange SI629 C - Manual (Page 17)

13
3. Installation
ENGLISH
Important note:
Fit a jumper between terminals 9 and 10 (12 and 13 in panel mount instrument) and another between
the terminals 11 and 12 (14 and 15 in panel mount instrument).
3.3.2. Cells with connector S8
3.4. Protective wiring of switching contacts
Relay contacts are subjected to electrical erosion.
Especially with inductive and capacitive loads, the service life of the contacts will be reduced.
For suppression of sparks and arcing, components such as RC combinations, nonlinear resistors, series
resistors and diodes should be used.
Typical protective wirings
AC applications with inductive load
DC applications with
inductive load
AC/DC with
capacitive load
Load
Contact
relay
Diode
1N4007
Typical RC at 230 VAC: Capacitor 0.1 µF/630 V
Resistor 100 Ω/1 W
RC
RC
R
Load
R, for example:
5 Ω / 1 W at
24 V / 0.4 A
Maximum relays load: AC < 24 V / < 3 A / < 72 VA.
TERMINALS
COLOUR
si629 C
(wall mount)
si629 C
(panel mount)
9 12 Middle
10 13 Middle
11 14 Shield
12 15 Shield
si629 C_HACH LANGE_Ed 0510.indd ANG:13 si629 C_HACH LANGE_Ed 0510.indd ANG:13 20/5/10 12:06:51 20/5/10 12:06:51