date / name
23.02.1999 Wl / Fz
Z. Nr.: 1029 0710.1
sheet 1 of 4
Type: MSF 220 SV
MINIPAN
®
digital panel meters, temperature- and mains controlling,
special purpose instruments for customer requirements www.ziehl.d
e
ZIEHL industrie-elektronik GmbH+Co, Daimlerstr.13, D-74523 Schwäbisch Hall, Tel.: +49 791 504-0, Fax: -56, e-mail: [email protected]
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MSF 220 SV
Application
The PTC-resistor trip device MSF 220 SV monitors the winding temperature of machines and
equipment. It signals “early warning" or “malfunction" (switching-off) or switches on a forced
ventilatition as soon as the nominal response temperature (NRT) in the relevant PTC-circuit is
exceeded.
Two PTC-circuits can be connected to this unit. The integrated rise-delay time ensures a
reliable mains voltage build-up.
Function
*
3 PTC resistor circuits, 1 to 6 PTC each (max. cold resistance of circuit 1500
Ω
each)
*
potential-free contact for switching forced cooling
*
potential-free contact for alarm 1
*
potential-free contact for alarm 2
*
LED´s signal state of relays
*
relay K3 picks up time-delayed
Note
Thanks to the delayed switching-on of the error message (approx. 2 s) after the switching-on,
this device is especially suitable where an auxiliary voltage is not available and the secondary
voltage of the monitored transformer is being used. The MSF 200 SV can furthermore b e
used advantageously when combining it with operating current releases. In case of malfunction
of the supply voltage or of the relay, there will be no tripping of the alarms. The correct function
can be detected by monitoring the no-contacts of the relays for alarm 1 or 2 (Pins 4 or 5).
Functional description
PTC-circuits in closed-circuit current principle. When the closed-circuit current flows, both output
relays K1, K2 are picked up. Approx. 2 sec. after switching on supply power, relay K3 picks
up time-delayed, closing the contact circuits at terminals 36-14 and 36-24.
When the NRT in the PTC-circuit "VENT" is exceeded, relay K4 picks up. The relay releases
app. 20 minutes after temperature has dropped under the switching point. This ensures a
longer period of cooling.
As soon as the temperature of the early warning has been reached, relay K1 releases
(terminal 36-12 closed), the alarm 1 is given. If the temperature of malfunction is reached, also
relay K2 releases (terminal 36-22 closed). This alarm 2 can be used to switch off the
equipment. If the temperature drops to approx. 5 °C below the temperature of malfunction or
early warning, the relays K1 and K2 are switched on again.
