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EXTENSION
MODULES
CONTACTORS
One or more FF-SRE3081 Extension Modules or
external contactors with positively driven contacts
can be used to multiply the number of contacts of the
FF-SRS5988 Emergency Stop Module. If multiple
safety contacts are used in parallel with one load,
the maximum allowed current can be increased.
For connection of the FF-SRE 3081 to the FF-SRS
5988 module, see the Installation Instructions for the
FF-SRE 3081 Extension Module.
CONTACT MULTIPLICATION VIA EXTERNAL
RELAYS
• If contact multiplication via external safety relays
(or the FF-SRE3081 Extension module) is
necessary, connect one normally closed contact
of each relay (or 81/82 of the Extension module)
in series into the Final Switching device
monitoring loop (terminals Y1/Y2).
Failure to comply with this instruction could
result in death or serious injury.
LED INDICATORS
The FF-SRS5988 module has three green LED
status indicators (Power, K2 and K3) as illustrated
below.
The Power LED indicates power is applied to the
safety control module. Illuminated K2 and/or K3
LED's indicate(s) that the corresponding internal
safety relay is energized. Both K2 and K3 relays
must be energized to have the normally open
contacts 13/14...63/64 in a closed position. If one of
the safety relays de-energizes, the normally closed
contact will close.
107018-04 EN FR26 GLO 1198 Printed in Germany
AND
EXTERNAL
FIG 8. MODULE FRONT PANEL
S11
S
S
S
S
S
A1
A3
12
21
23
22
12
(+)
A1
PE(-)
13
S12
S12
S21
S22
K2
S23
Y1
K
Y2
23
X1
K3
X2
S33
S34
A2
S11/A3+
14
S
S
PE
Y1
Y2
X1 X2
33
34
(-)
FIG 9. FUNCTIONAL DIAGRAM
Start push-
button
Emergency
stop
*
K2
K3
* Line fault Detection on Start push-button:
If the start push button is closed before voltage is
applied to S12 and S23 the safety contacts of the
module cannot close.
This additional feature ensures the detection of a line
fault via the start push-button or a blocked start push
button. In case of a push-button failure the module
can not be restarted.
In order to let the line fault detection work properly,
the internal safety relays should have been de-
energised for at least 10 seconds before.
A4
13 23 33
43
53
63 81
(-)
23
33
43
53
63
81
24
34
44
54
64
82
14
24
34
44
54
64
82
A2
activated
released
Input
released
activated
Output
5
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