Practical Notes; Operating Potentiometer - DOLD SAFEMASTER C UG 6961 Mode D'emploi

Practical Notes

Operating mode
Manual or auto start is chosen by wiring. On manual start S21 has to be
connected to ST1! via an NO push button. For auto start S21 is connected
to ST2. If both inputs are connected to S21 the unit goes into safe failure
mode. A restart or new start of the device has to be made.
Only an automatic start at safety function two-hand control /3_ _ is possible.
Line fault detection e.g. monitoring of ON-button
If the On-button pressed more than 3 s the adequate output contacts of the
safety function can't be switch. The output contacts can be energized when
the On-button pressed again (0.1 s < t
A line fault is detected if the On-button more than 10 s is actuated. The
output contacts of the adeauate safety function can only be energized with
a reset or re-start with on an off switching of power supply.
Reset and external failures:
The reset input is used to reset external failures (application failures or
removable external failures as e.g. a line fault on reset button). If the reset
signal is connected to the input for more than 3 sec the unit makes a reset.
A new reset is only possible when the reset signal had been switched off
temporarily.
If an external failure occurs because both input channels of a safety function
did not switch on or off within the simultanious time, a reset is only possible
if both channels are switched to off state after removing failure cause.
Setting delay mode
On the variant /_0_ the delay mode can be set via rotary switch t
Possible functions:
t Function
Fkt
1 Release delay
Release delay
2
retriggerable
3 On delay
4 Fleeting on make
5 Fleeting on break
Description of the time delay functions
Off delay
If the sensors/switches of the safety function are switched off or an ex-
ternal failure in the safety function is detected, the adjusted time delay is
started. After elapse of the delay time the contacts switch off.
Restarting of the output contacts is only possible after the time is fully
elapsed.
Off delay retriggerable
If the sensors/switches of the safety function are switched off or an ex-
ternal failure in the safety function is detected, the adjusted time delay
is started. After elapse of the delay time the delayed contacts switch off.
On before the time is elapsed, or the the external failure is removed and
reset and the starting conditions are fulfilled (manual or auto start) the
contacts remain switched on.
On delay
If the sensors/switches of the safety function are switched on the adjusted
time delay is started. After elapse of the delay time the contacts switch on.
If the sensors/switches of the safety function are switched off before the
time is elapsed, the time is stopped and the safety contacts remain swit-
ched off. When the sensors/switches of the safety function are switched
on again then the time delay is started from the beginning.
< 3 s).
ON
.
Fkt
Practical Notes
Fleeting on make
If the sensors/switches of the safety function are switched on, the contacts
are switched on and the adjusted time delay is started. After elapse of the
delay time the contacts switch off.
If the sensors/switches of the safety function are switched off before the
time is elapsed the safety contacts are also switched off.
Fleeting on break
If the sensors/switches of the safety function are switched off or an ex-
ternal failure in the safety function is detected, the safety contacts are
switched on and the adjusted time delay is started.
After elapse of the delay time the contacts switch off. If the sensors/swit-
ches of the safety function are switched off before the time is elapsed the
safety contacts are also switched off again.
Adjusting the time delay
With rotary switch t the time range for the delayed contacts is selected.
max
With rotary switch t the time is adjusted within the selected range in 10 %
steps.
Example: required time = 0.8 s
1. Example:
= 1 s ; t = 0.8 ≥ t
t = t x t = 1 s x 0.8 = 0.8 s
max v max
2. Example:
t = 2 s ; t = 0.4 ≥ t = t x t = 2 s x 0.4 = 0.8 s
max v max
Repeat accuracy
The repeat accuracy of the delayed contact depends on different factors:
Repeat accuracy t = system reaction time
W
Pick up or drop off time depending on delay mode
1)

Operating Potentiometer

Poti "t "
Fkt
Poti "t "
max
Poti "t"
20
± 1 % of t
)
v
Adjustment of delay function
Adjustment of time range
Fine adjustment at time range
UG 6961 / 08.07.19 en / 214A