Datasheet

Electronic monitoring relays PMDsigma
True power monitoring
PMD s10
NSG-D-2-422-2014-04Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: [phone], Telefax: [phone], E-Mail: [e-mail]
-2
Function description
Funktionsbeschreibung_Text_1
The PMD s10 monitors the true power
on a single, three phase or DC supply
to ensure it doesn't exceed or drop
below a certain value. The unit oper-
ates in accordance with the Aron cir-
cuit principle.
Relay outputs (K1 and K2)
K1 and K2 operate in normally ener-
gised mode. In their default state, aux-
iliary contacts 11-14 and 21-24 are
closed and auxiliary contacts 11-12
and 21-22 are open. Normally ener-
gised mode is the default setting; this
setting can be changed via the menu.
Analogue outputs (U
out
and I
out
):
The unit forms two output signals
which are proportional to the true
power. The limit value corresponds to
P
max
(see timing diagram). The status
of the threshold monitoring function is
displayed at the auxiliary contacts and
LEDs, along with the analogue output
signals. The hysteresis of the switch-
ing thresholds can be set between 0 %
... 50 %.
Current transformer CT:
With continuous currents > 12 A, the
measuring current must be measured
via an external current transformer.
Po function (K1 overload):
If the measured true power exceeds
the switching threshold Po, the ">
max" LED is lit. Once the response
time has elapsed (t
r
), the auxiliary con-
tact switches (default: relay K1) and
the "Out 1" LED is lit.
Pwo function (overload warning
threshold):
Serves as a warning; for function de-
scription, see Po function (K1 over-
load)
Funktionsbeschreibung_Text_2
Pu function (K2 underload):
If the measured true power drops be-
low the switching threshold PU, the "<
min" LED is lit. Once the response time
has elapsed (t
r
), the auxiliary contact
switches (default: relay K2) and the
"Out 2" LED is lit.
Pwu function (underload warning
threshold):
Serves as a warning; for function de-
scription, see Pu function (K2 under-
load)
Start suppression time (t
Start
):
The measurement is suppressed dur-
ing the machine's start-up phase, in
order to avoid spurious output signals.
The start suppression time t
Start
is infi-
nitely variable.
Response time (t
r
):
With transient load fluctuations, the
switching threshold can be sup-
pressed. The response time t
r
is infi-
nitely variable.
Reset mode:
The fault status (value below Pu or
above Po) can be reset automatically
or via an external reset button.
Timing diagram
Zeitdiagramm
P tatsächliche Wirkleistung/Actual true power/puissance active réelle
t
s Startunterdrückungszeit/Start suppression time/Temps de suppression au démarrage
t
r Reaktionszeit/Response time/Temps de résponse
Pu
Po
0%
100%
P
t
ts tr tr
t
LED >max
t
tr
ts
t
tr tr
ts
ts
t
LED <min
tr
5%
OUT1
Hystérésis
Hysterese/
Hysteresis/
OUT2
Hystérésis
Hysterese/
Hysteresis/