AD-MK 350 GVD

Description

The limit switch AD-MK 350 GVD serves the switching of limiting values on analogue signals, transmitter signals and resistance thermometer. When a 2-wire transmitter is connected, it is supplied directly by a galvanically isolated and current-limited supply voltage. The device features analogue inputs for current, voltage and resistance thermometers, which can be used interchangeably. With its two potential-free changeover contacts, the AD-MK 350 GVD can switch a maximum of two independent limit values. The switching thresholds and operating modes can be freely configured. This can be done via the optional AD-VarioControl operating module or the AD-Studio programming software. The status of the respective relay is indicated by an LED on the front panel or on the AD-VarioControl operating module.

Application

Switching limit values to active analog signals, 2- / 3-wire transmitters, and resistance thermometers, e.g. Flows, heights or temperatures.

Specific characteristics

bipolar current input (+/- 0.5 mA to +/- 50 mA)
bipolar voltage input (+/- 1 V to +/- 100 V)
power supply of 2- / 3-wire transmitters
two potential-free change-over contacts
operating module as an accessory
23mm narrow housing with detachable terminal clamp

Business data

Order number
Vario - Limit Switch	AD-MK 350 GVD
Accessory (optional)
Operating module	AD-VarioControl
USB programming adapter	AD-VarioPass
Configuration software	AD-Studio
Identifiers
EClass	27210122
Customs tariff number / country of origin	8538 90 91 / Deutschland

Information

Downloads
Data sheet	en-mk350gvd.pdf (249 kB)
Operation manual VarioControl	man-variocontrol-ad-en.pdf (1 MB)
Tender text	mk350gvd.zip (10 kB)
Safety instructions	ad-safety-instructions.pdf (86 kB)

Technical specifications

Input current
Measuring range	-50 ... + 50 mA DC
Input resistance	40 Ohm
Resolution	16 Bit
Accuracy	0,1 % of full scale
Input voltage
Measuring range	-100 ... + 100 V DC
Input resistance	1 MOhm
Resolution	16 Bit
Accuracy	0,1 % of full scale
Transmitter supply
Off-load voltage	24,5 V
Voltage at 20mA	17,5 V
Current limit	~ 25 mA
Resistance thermometer inputs Pt100, Pt500, Pt1000 to DIN EN 60751
Measuring range	-200 ... +850 °C
Connection method	2-, 3- oder 4-wire system
Resolution	16 Bit
Accuracy	0,6 K
Smallest measuring spans	20 K
Max line resistance ¹⁾	10 Ohm/cable
Sensor supply	310 µA
¹⁾ With 2-conductor the line resistance comes as an offset into the measurement.
Resistance thermometer inputs Ni100, Ni500, Ni1000 to DIN EN 43760
Measuring range	-60 ... +230 °C
Connection method	2-, 3- oder 4-wire system
Resolution	16 Bit
Accuracy	0,6 K
Smallest measuring spans	20 K
Max line resistance ¹⁾	10 Ohm/cable
Sensor supply	310 µA
¹⁾ With 2-conductor the line resistance comes as an offset into the measurement.
Relay outputs A/B
Contact type	Potential free changeover
Max. AC-breaking capacity	250 V AC, 2 A AC, 50Hz
Max. DC-breaking capacity	50 V DC, 2 A DC
Switching operations
Mechanical	10⁷
AC: 230V / 2A, cos(phi)=1	6 * 10⁵
AC: 230V / 2A, cos(phi)=0,4	2 * 10⁵
DC: 24V / 1A	2 * 10⁵
Transmission behaviour
Rise time	500 ms (output auf 90 %)
Temperature influence	+/- 100 ppm/K of full scale
Supply
Voltage range AC	50 ... 253 V AC, 50/60 Hz
Nominal voltage AC	230 V AC
Voltage range DC	20 ... 253 V DC
Nominal voltage DC	24 V DC
Power consumption AC / DC	4 VA / 2,4 W
Housing
Dimensions (WxHxD)	23x110x134 mm
With operating module (bxhxt)	23x110x138 mm
Type of protection	IP 20
Connection method	Detachable terminal clamp
Terminals, wire cross section	2,5 mm² flex wire / 4 mm² one wire
Bolting torque terminals	0,5 Nm
Weight	~ 150 g
Manner of fastening	35 mm DIN rail 35mm
Environmental conditions
Ambient temperature	-10 ... 50 °C
Storage and transport	-10 ... 70 °C (no condensation)
EMC
Product family standard ¹⁾	EN 61326-1
Emitted interference	EN 55011, CISPR11 Cl. B, Gr. 1
¹⁾During electromagnetic disturbance minor changes in output signal are possible.
Electrical safety requirements
Product family standard	EN 61010-1
Overvoltage category	II
Pollution degree	2
Galvanic isolation, test voltages
Input/output	2,5 kV (1 min)
Signal/auxiliary voltage	3 kV (1 min)

Block and wiring diagram

AD-MK 350 GVD

Dimensions

AD-MK 350 GVD

CAD / CAE Daten

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AD-MK 350 GVD

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Display and operating elements

On: LED for operating display in green
on - normal operation
flashing - Signal failure, signal outside range limits
Rel: two LEDs for relays A and B in red
on - relay activated

AD-PC: Communication interface for configuration by a PC

Communication interface for VarioControl

Modbus Communication

The optional AD-VarioConnect operating module has an RS-485 interface. The data is transferred via the Modbus RTU protocol, the AD-VarioConnect operating module represents a Modbus slave. Communication takes place according to the master-slave procedure and starts with a request from the master, e.g. from a PLC or a PC. Each bus participant must have a unique address. If a slave detects that its address has been addressed by the master, the slave always sends an answer. The slaves never communicate with each other. They are also not able to start a communication with the master.
The Modbus master can read out the individual registers of the AD-MK 350 GVD via the addresses.
The default standard data format is 19200,e,8,1 with slave address 1. These settings can be changed via the AD-VarioConnect operating module.

Start address	Number of registers	Name	Unit	Data type	read	write
Measured values:
40607	2	Input signal	mA / V / Ohm	7	1	0
40609	2	Scaled input	°C / ?	7	1	0

Legend of the datatypes:

U08: 1	S08: 2	U16: 3	S16: 4	U32: 5	S32: 6	float: 7