D
ESCRIPTION OF
S
YSTEM
6844
AND
6844RC
22 / 157
System 6844(RC) - V03.00
hopf
Elektronik GmbH
Nottebohmstr. 41
• D-58511 Lüdenscheid • Tel.: +49 (0)2351 9386-86 • Fax: +49 (0)2351 9386-93 • Internet: http://www.hopf.com • E-Mail: [email protected]
1.2.3.6 Function Board Slots
Up to two Function Boards can be implemented in the System 6844(RC) 1U Slim Line.
As a basic principle, the slot can be freely selected for each 'Function Board' / 'System-Bus
Function Board'.
Exceptions of the slot selection can be found in
Chapter 8 Function Boards
Only boards that have been adapted for the 1U Slim Line System can be used in these slots.
Slots that have been prepared for special functions are identified with the letters
"A"
and
"B"
.
1.2.3.7 Temperature-controlled Forced Ventilation
The clock system has two temperature-controlled fans to prevent the operating temperature
rising above the allowed limit as a result of thermal coupling with equipment mounted in the
control panel.
These fans are mounted on the side ventilation apertures and switch in when the tempera-
ture in the equipment reaches approx. 45°C.
The ventilation apertures on the left and right hand sides must not be cov-
ered. Otherwise, active ventilation is ineffective and inadequate convection
and/or thermal coupling with surrounding equipment may cause the tem-
perature to rise above the equipment’s maximum permissible operating
temperature.
