Datasheet

ESG 5.8
Function description
1-phase direct-current voltage monitoring relay
EMR SU21I, SU21J, SU21K, SU21L
Measuring range 12, 24, 36 or 48 Vdc
Supply voltage = measuring range
For all the functions the LEDs MIN and MAX are flashing alterna-
ting, when the minimum value for the measured voltage was
chosen to be greater than the maximum value.
If a failure already exists when the device is activated, the output
relays remain in off-position and the LED for the corresponding
threshold is illuminated.
Under voltage monitoring (UNDER)
When the measured voltage falls below the value adjusted at the
MIN-regulator, the output relays switch into off-position (yellow
LED not illuminated). The output relays again switch into on-
position (yellow LED illuminated), when the measured voltage
exceeds the value adjusted at the MAX-regulator.
Window function (WIN)
The output relays switch into on-position (yellow LED illuminated)
when the measured voltage exceeds the value adjusted at the
MIN-regulator. When the measured voltage exceeds the value
adjusted at the MAX-regulator, the output relays switch into off-
position (yellow LED not illuminated). The output relays again
switch into on-position (yellow LED illuminated) when the measu-
red voltage falls below the value adjusted at the MAX-regulator
(red LED MAX not illuminated). When the measured voltage falls
below the value adjusted at the MIN-regulator, the output relays
switch into off-position (yellow LED not illuminated).
U
LED MAX
LED MIN
Max
Min
U
LED MAX
LED MIN
Max
Min
DimensionsConnection
51
38
80
4713 20
9
10
11
1
2
3
8
7
6
5
4
+U
N
0V