ZIEHL MS220K, Руководство по эксплуатации, Страница: 4 / 8

MS220K and MSR220K 10750-0702-00 Page 4 / 8 www.ziehl.de
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Display and Operating Elements
MS220K MSR220K
Reset-Button
Alarm red ON = green
ON green Alarm = red
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Functional overview

1 PTC-resistor set with up to 6 PTC-
sensors (250Ω) in series

output relay with 1 or 2 change-over contact (co)

operating status display with LED

K-Housing, vertical terminal order

width 22.7 mm

snap mounting on 35 mm standard DIN rail or screw mounting
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Detailed description
A current monitors continuously the resistance of the sensors. In cold state, the resistance is <250 Ω per
sensor (sensor circuit < 1,5 kΩ). The relay has picked up and contacts 11/14 (21/24) are
closed(LED/Button=GN). The resistance of the sensor rises rapidly at nominal response temperature NRT.
The relay releases
at a resistance of 3…4 kΩ and contacts 11/12 (21/22) close(LED/Button=RED). MS types
switch on automatically when the temperature has decreased approx. 5 °C. MSR types with electronic
reclosing lock switch on again when the temperature has decreased approx. 5 °C and RESET is made (push
built-in button or external RESET with terminals Y1/Y2 closed) or by return of supply voltage.
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