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Function Diagram Frequency Monitoring
n
}
Threshold
Overfrequency
Hysteresis
}
Hysteresis
Underfrequency
Threshold
U
U
H
(A1/A2)
Alarm memory
Monitoring function
t
A
"Overfrequency"
Monitoring function
t
A
"Underfrequency"
M
onitoring function
t
A
"Inside range"
t = Start-up delay, t
A
* Depending on the direction of rotation monitoring
Function Diagram Rotation Monitoring
wrong
Direction of rotation
correct
U
U
H
(A1/A2)
Alarm memory
Output relay
n
n v
A
K1/K2 *
n = Start up tolerance, n
A
* Depending on the frequency monitoring
P
P
t v
t
t v
F
t v
t
F
t v
t
t v
t
F
F
M11332_a
= Alarm delay, t = Reset delay
F
V
P
P
P
n v
= Alarm tolerance
V
Circuit Diagrams
E2H E2L
A1
A2
GND
E3H
+
13 23
+
K1
K1/K2
K2
38
14 24
T1
13
14
23 24
GND
t
F
UH 6937
t
F
Connection Terminals
Terminal designation
A1+
A2
E1a, E1b, E2L, E2H, E3L, E3H
GND
13, 14, 23, 24
38, 48
T1, T2
M12556
RES, RF, SW1, SW2, SW3, SW4
A +, A GND
Applications
Safe frequency and speed monitoring of AC voltages
• Safe monitoring of the outputfrequency of inverters
• Safe monitoring of the rotorfrequency of slipring motors
• Safe control / monitoring of motorts in crane applications
• Safe monitoring of the direction of rotation with 3-phase AC voltages
With correct connection it is possible to realise with the UH 6937 the
safety functions STO (Safe Torque Off), SOS (Safe Operating Stop), SLS
(Safely Limited Speed), SSM (Safe Speed Monitor), SSR (Safe Speed
Range) as well as SDI (safe direction of motion) according to EN 61800-5-
2. The actual realisation of the safety functions has to be validated in each
application of the product for safety aspects.
22
E1a
A1
E3L
E1b
A2 GND
+
13 23
K1
ERR
K2
48
14 24
RES
T2
RF
13
14
23 24
38
48
M10823_e
UH 6937/_ _1
Signal designation
DC24V
0V
Frequency measuring inputs
Reference potential for
semiconductor monitoring output
and control outputs
Forcibly guided NO contacts for
release circuit
Semiconductor-monitoring output
Control output
Control input
Analogue output
UH 6937 / 30.05.22 en / 551A
E2H E2L
E1a
E3H
E3L
E1b
+
K1/K2
ERR
38
48
T1
RES
T2
RF
A
A
38
48
+
GND
SW1
SW2
SW3
SW4
M10826_e
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