•
Industrial Safety Products
•271
!
WARNING
MISUSE OF DOCUMENTATION
• The information presented in this product sheet (or catalogue) is for reference only. DO NOT USE this document as system
installation information.
• Complete installation, operation and maintenance information is provided in the instructions supplied with each product.
Failure to comply with these instructions could result in death or serious injury.
FF-SRT
FF-SRT Series
The FF-SRT Time Delay module provides a time delay before safety contacts are
opened.
If a two-channel version is used, the output contacts of the two time delay circuits
are connected in series. When the displayed time has elapsed, the safety contacts
within the module open safely, even if one of the other contacts is welded.
When power is applied to the module (A1/A2), the normally closed contact (15/16)
will open immediately and the normally open contact (27/28) will close.
After power is removed from the module (A1/A2), the normally closed contact (15/
16) will close and the normally open contact (27/28) will open after the fixed or set
time has elapsed.
For example, this module may be used with an emergency stop module. The emer-
gency stop module will immediately forward the emergency stop condition to the
machine control circuitry. The time delay module can be used to keep some non-
safety related machinery operating (door locked) for a short period of time to avoid
an unsafe condition or simplify the machine startup cycle.
CATEGORY 1
per EN 954-1
S
uitable for interfaces
up to
FF-SR Series
FF-SRT Time Delay Module
FEATURES
•Complies with the Machinery Directive
98/37/EC, IEC 255, VDE 0435, and
UL 508
•Provides a delay after module is
de-energized
•Output: one NC, one NO positive-guided
contacts
•Available with one or two time delay
circuits (channels)
•Available with fixed or selectable delay
up to 30 seconds
•LED status indication
•Mechanical life up to ten million
operations
•Electrical life up to 300 000 operations
•Switching current up to 8 A
•Voltage drop protection
•45 mm / 1.77 in width
TYPICAL APPLICATIONS
•Time delay required before
disconnection of safety interface circuit
272 •
Industrial Safety Products
•
FF-SRT
FF-SRT Series
LIMITATION FACTOR FOR
INDUCTIVE LOADS
Power factor < 1 (cos ϕ)
Note: see table
above for available
time ranges
CATEGORY 1
per EN 954-1
S
uitable for interfaces
up to
FF-SRT Time Delay Module
SPECIFICATIONS
•Time delay before disconnection of safety interface circuits
General technical data Available time ranges Adjustable 1 channel: SRT _ _ 1R: 0,1 to 1 s ; 0,3 to 3 s ; 0,5 to 5 s;
1 to 10 s; 3 to 30 s
Fixed 1 channel: SRT _ _ 1F: 1 ; 5 ; 10 and 30 s
Adjustable 2 channels: SRT _ _ 2R: 0,1 - 1 s ; 0,5 - 5 s ; 1 -10 s
Fixed 2 channels: SRT _ _ 2F: 1, 5, 10 s
Repeatability precision + 15 % from selected value
Input Nominal voltage 120 Vac (-15%, +10%), 230 Vac (-20%, +10%), 24 Vdc (-10%, +20%)
Nominal consumption One channel model: 0,85 W, 4,5 VA; Two channel model; 1,7 W, 4,5 VA
Nominal frequency 50 to 60 Hz
Output Contact complement 1 NO contact, 1 NC contact
Contact type Safety relay, positive-guided
Switching Capability Power factor = 1 with resistive load
Current Range (min. to max.) 30 mA to 8 A
Voltage Range (min. to max.)
Dc 10 to 110 Vdc
Ac 10 to 250 Vac
Switching capability (per ac15: EN 60947-5.1) NO contact: 3 A / 250 Vac - NC contact: 1 A / 250 Vac
Typical Electrical Life Expectancy Power factor = 1 at 230 Vac/dc
3 A 300 000 operations
5 A 150 000 operations
10 A 100 000 operations
Typical Power Factor (cos ϕϕ
ϕϕ
ϕ)Limitation Factor (See Note 1 and Note 2)
0,3 0,45
0,5 0,70
0,7 0,85
11
Operating frequency 2000 switching cycles/hour (max.)
Fuse rating 6 A time delayed
Mechanical life Ten million switching operations
General Temperature range -20 °C to +60 °C / -4 °F to 140 °F at max. 90% humidity
Sealing
Housing:
IP 40 •
Terminals:
IP 20
Housing material Thermoplastic
Vibration resistance Amplitude 0,35 mm; Frequency 10 to 55 Hz
Conductor connection 2 x 2,5 mm2 solid (max.) [12 AWG] or 2 x 1,5 mm2 [16 AWG] (max.)
stranded wire with sleeve DIN 46288
Conductor attachment Flat terminal according to DIN 46206 and DIN 57609/VDE
Mounting Quick install rail mounting EN 50022-35
Weight 200 g / 0.44 lb for Vdc / 350 g / 0.77 lb for Vac
ORDERING INFORMATION
FF-SRT Voltage:
2 = 24 Vdc
E = 120 Vac
G = 230 Vac
R: Time adjustable
F: Time fixed
Number of channels:
1 = 1 Channel
2 = 2 Channel (24 Vdc only)
Max delay time:
01: 1 s
03: 3 s
05: 5 s
10: 10 s
30: 30 s
Note 1: Total operations = Operations at power factor 1
multiplied by the limitation factor. If the power factor is 0,5
at 230 Vac, 2 A (300 000 operations), the limitation factor
is 0,70. 300 000 x 0,70 = 210 000 total operations.
Note 2: Install arc suppression device across load to avoid
module contact arcing and ensure specified relay life ex-
pectancy.
CONTACT LIFE FOR 100%
RESISTIVE LOAD (TYPICAL)
Power factor = 1 (cos ϕ)
Power factor
0,2
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
1
0,4 0,6 0,8 1
Limitation factor F
Switching power P [kVA]
0,2 0,4 0,6 0,8 1,0 1,2 1,4 1,6 1,8 2,0
0
105
2
4
6
2
4
6
2
4
6
106
107
108
Operation
•
Industrial Safety Products
•273
FF-SRT
FF-SRT Series
MOUNTING DIMENSIONS
Width: 45 mm / 1.77 in; Height: 74 mm / 2.91 in;
Depth: 121 mm / 4.76 in
FUNCTIONAL DIAGRAM
U
H
A1/A2
15-16
27-28
t
U
t v = time delay
t v
<
t v
APPLICATION EXAMPLE
A2
(-)
S21
PE S
33 S
34
13 23 33 41
14 24 34 42
Honeywell
FF-SRS5935
Power
K2
K3
Honeywell
FF-SRT
A1
A2
27
28
15
16
S
22
S
12
S
11
A1
(+)
K1
L1
L2
L3
+Vdc
Start
push
button
To
Speed
Driver
Power of
Speed
Driver
-Vdc
Emer-
gency
Stop
K1
S1
S2
Internal
Switches
Fuses
M
Speed driver
Instant stop
via
FF-SRS5935
emergency stop
module
K1
Delayed power removal
via
FF-SRT
time delay module
The example shows an emergency stop circuit with a motor using a speed driver. When an emergency stop condition occurs (e. g. the emergency
push-button is pressed), the speed driver is shut down immediately via the emergency stop module FF-SRS5935 and the dangerous movement of
the motor is stopped. When the delay time has elapsed, the power will be removed via the FF-SRT time delay module. External, positive guided
relays have to be monitored in the S33/S34 loop by its normally closed contacts.
INSTALLATION DIAGRAM
WIRING DIAGRAM
ONE CHANNEL (FF-SRT_1__) TWO CHANNEL (FF-SRT_2__)
27
28
15
16
A1
A2
A1 15 27
16 28 A2
27
28
15
16
A1
A2
A1
A2
A1 15 27
16 28 A2
Rail 121 ± 0,4
73,2
45
