Technical Data; Module Bus; Ups Battery Back-Up; Genibus (Rs-485) - Grundfos CU 401 Instrucciones De Instalación Y Operación

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6. Technical data

Supply voltage
24 VDC ±7% from PU 101.
Current consumption
Max. 5.9 W when all inputs and outputs are active.
Max. charging current for PU 102 ~ 250 mA.
Ambient temperature
• During operation: –20°C to +60°C
(must not be exposed to direct sunlight).
• In stock: –25°C to +85°C.
• During transportation: –25°C to +85°C.

7. Module bus

7.1 UPS battery back-up

The CU 401 unit can be connected to an emergency
supply, i.e. UPS battery back-up (UPS – Uninterrupt-
ible Power Supply), via the PU 102 module. The
emergency supply time depends on the battery size.
The battery is automatically charged as long as the
CU 401 unit is supplied with 24 V.
An indicator light on the CU 401 front shows "battery
OK". The charging state is indicated on the PU 102.
For further information, see installation and operat-
ing instructions for the PU 102.

7.2 GENIbus (RS-485)

The GENIbus is a Grundfos standard using an
RS-485 interface. The GENIbus is used for several
Grundfos products.
Detailed documentation about the GENIbus can be
requested from Grundfos.
12
The module bus is the electrical connection between the
modules. Up to 12 modules can be connected.
The total current consumption must not exceed
• 2 A at 24 V and
• 1.5 A at 5 V.
See installation and operating instructions for the module in
question.
Module bus
Relative air humidity
From 5% to 95%.
Materials
Enclosure class: IP 20.
Plastic type: Black PC / ABS.
Internal battery
Type: CR 2032.
Data: 3 V lithium battery.
The expected service life of the battery is 3 years.

7.3 IR communication

The CU 401 unit is prepared for the Grundfos remote
control R100.
For further information, see installation and operat-
ing instructions for the CompactFlash card.

7.4 Operator display (OD 401)

Grundfos operator display for CU 401, see installa-
tion and operating instructions for the OD 401.

7.5 Communication to PC (RS-232)

Communication port for PC Tool. For connection to
the port, see "RS-232 input" in section
5.3 Terminals.