schmalenberger FLUVO Control NT - Current Monitoring; 1-Phase and 3-Phase Operation; Fault Message; External Sensor Button

Schmalenberger GmbH + Co. KG
D-72072 Tübingen / Germany
Control box Control NT
Version: 27248 - C
6
Subject to technical changes
2.6 Current Monitoring
When the pump is active the phase currents are monitored for overcurrent and undercur-
rent. Current monitoring is performed in accordance with IEC 60947-4-1. The set rated cur-
rent can be found on the nameplate. Undercurrent monitoring checks whether the current
drops below the minimum current for a minimum time. If an overcurrent or undercurrent er-
ror is detected, the pump is switched off, the red fault LED is lit and relay output 2 "Mal-
function" is active. After a malfunction the pump cannot be activated again until the control
box has been reset by disconnecting the mains power.
2.7 1-Phase and 3-Phase Operation
The control box distinguishes between 1-phase and 3-phase operation. This means that
control boxes that are programmed for 1-phase operation can
not be used for 3-phase
operation and vice versa. For programming instructions please refer to the nameplate and
see section 6.
When the setting is "1 phase", the other two phases are checked for an impermissible cur-
rent. If the measured current of phases V and W exceeds the set minimum current for the
set minimum duration, an overcurrent error is triggered for phases V and W.
When the setting is "3 phases", all three phases are checked for the minimum current. If
this measured value exceeds the set minimum current, an undercurrent error is triggered.
2.8 Fault Message
Display: Red LED flashing
Signal contact: closed
2.9 Additional function
2.9.1 External sensor button
When using a converter box 3.0, additional sensor buttons can be connected. This func-
tionality can be activated via DIP switch 4. (see chap. 4)
Possible causes
1 Overcurrent error - Phase current I > rated current I
N
(see nameplate)
- 3-phase motor on 1-phase control box
- Phase error
2 Undercurrent error - Phase current I < 0.3 A
- 1-phase motor on 3-phase control box
- Phase error
After operational reliability is ensured and malfunctions are rectified, the control
box fault message can be reset by disconnecting the mains power.