57
X
DANGER!
CAUTION!
DANGER!
NOTICE!
11.4 Drive solenoid
DANGER!
Components are energized!
Electric shocks can kill! Unplug the mains connector before opening the pump.
CAUTION!
Hot metal parts may burn your hands. Always disconnect the mains power supply
before opening the magnetic drive and let the dosing pump cool down for at least one
hour.
To check, measure the electrical resistance of the solenoid coil when it has cooled
down. Disconnect the leads from the electronic unit first.
Drive solenoid
1, 2 Power supply
3
Ground connection
4
Letter
The solenoids differ, depending
on the pump version.
NOTICE!
The resistance value is up to 30% higher when the coil is at operating temperature.
If the resistance is substantially lower, there is a short-circuit in the coil. If the resistance
is high, the coil is burned out or the wire is broken.
There must not be an electrically conductive connection between the power supply
connections
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+
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and the ground connection
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. (Resistance cannot be measured!).
DANGER!
Components are energized!
Electric shocks can kill!
The coil must not be used if there is any electrically conductive connection between the
ground connection and the power supply.
After measuring the resistance across the coil, reconnect wining to ciruit board (refer to
Chapter 11.6 „Diagram of ciruit board“). The ground conductor must be reconnected
under all circumstances.
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Resistance at 20°C (68°F) +/-5%
Pump type 230V~ Letter
115V~ Letter
LC
104
Ω
“D“
26
Ω
„E“
