WIKA SC64 - Handbuch (Seite 15)

15 WIKA operating instructions models SC58, SC64
14054366.01 10/2012 GB/D
GB
7. Semiconductor switches such as thyristors, triacs or SSRs generate
interference voltages due to their non-linear characteristics and their
finite gate trigger voltage. This also protects them against surges due
to their limited reverse voltage. Here, varistors, RC filters or chokes
are often used. If possible, for semiconductor switches the use of
zero-voltage switches is recommended.
8. Use a line filter for mains voltage to controllers, where the mains
supplies are very noisy. Fit the filter as close as possible to the
controller and connect with short lines, safe from touch. The filter
absolutely must be connected to a protective earth. Note that a small
reactive current flows to ground.
The supply of the loads connected through the controller must not be
tapped on the controller side after the mains filter.
7. Configuration
SOFTWARE .10
Setting options
Key: UP
By pressing this key, the parameter or the parameter value is
increased.
Key: DOWN
By pressing this key, the parameter or the parameter value is
reduced. On an alarm, the buzzer function is switched off by
pressing this key.
Key: SET
While this key is pressed, the set point will be displayed.
This key is also used for parameter setting.
6. Commissioning, operation / 7. Configuration