Schmalenberger GmbH + Co. KG
D-72072 Tübingen / Germany
Control box Control NT
Version: 27248 - C
5
Subject to technical changes
2.3 Runtime Limiting, Time lag relais
The control box can be used for runtime-limited switching off of a 1-phase or 3-phase
pump. The runtime (1 - 60 minutes) can be determined with a potentiometer in the terminal
compartment. Adjusting the potentiometer while the pump is running has no effect on the
runtime that has started. The modified runtime will not be used until the next time the pump
starts. When the pump is running, relay output 1 "Pump on" is active.
2.4 Piezo Button/Sensor button, Latching switch, Pneumatic Button
(pressure wave mode)
A floating switching contact (for example a piezo button), latching switch or a pneumatic
button must be used as the actuator to switch the pump on and off. The two actuators are
equal in priority and can be used individually or together depending on what is enabled. A
latching switch is connected to the same terminal as a piezo button. The functionality can
be configured with DIP switch 6 (see section 4.4).
An output for lighting is provided for the piezo button. It is on outside of the pump disable
time and off during pump disable time. When pressure is applied to the piezo button or the
pneumatic button, the lighting flashes briefly. This feedback function is deactivated in state
as supplied, but it can be activated with DIP switch 5 (see section 4.4). The pump can be
turned on with the actuators. The pump can optionally be switched off after the runtime
elapses or after pressure is applied to the actuator again. After the pump is switched off a
disable time of 2 seconds is active. The pump cannot be activated again until after the
disable time elapses.
2.5 Calibrating the Pneumatic Button
Semi-automatic calibration of the control unit pressure input is provided to be able to use
different pneumatic buttons and hoses of different lengths. At the time of delivery the con-
trol unit is set for maximum sensitivity to be able to reliably evaluate pneumatic buttons with
small volume used together with long hoses.
Calibration of the pneumatic button input is performed by 5 activations within a time
window of 15 seconds.
The sensitivity can be reset to the setting at the time of delivery (for example after replacing
the pneumatic button or extending the hose).
To do this follow these steps:
• Disconnect the power to the control unit
• Disconnect the piezo button and bridge the terminals for the piezo button to the control
unit
• Supply the control unit with electrical power and wait for the following LED pattern: At
first the green LED flashes quickly (four times per second). Then the red LED is lit for
five seconds. After the five seconds elapse, the red LED goes out. The sensitivity is
now reset to the setting at the time of delivery. The control unit does not respond until
after a restart on the piezo and pneumatic button.
• Disconnect the power to the control unit, remove the bridge and reconnect the piezo
button.
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