gazex MDP-1.A/ T, Руководство пользователя

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MDP-1.A/T Control Unit User Manual issue 4W32en
©gazex’2016 v1609
Page 2 / 16
1. PURPOSE
The MDP-1.A/T digital measurement module is designed for use with one of GAZEX gas detector
types DEX/F, DEX/A or DEX/P (for operation in explosive gas atmospheres of temperature class T4) or
type DG/F, DG/P or DG.EN (for operation outside potentially explosive atmospheres) - see Compatibility
Table 1.2.
The cooperation consists of cyclical measurement and control of detector signals. When the
specified concentration values are exceeded, the optical alarm signaling is activated, the module outputs
are activated and information is transmitted to the monitoring module (e.g. MDD-256/T) or any
visualisation system via the RS-485 industrial standard network in accordance with the MODBUS RTU
protocol (in the MDP-1.A/TM option).
In the further part of this manual, any MDP-1.A/T... module will be referred to as the "
MDP
" module. -
unless the description is model-specific.
In the later part of this manual, the term "detector" or "DEX" will refer to a DEX/F, DEX/A, DEX/P, DG/F,
DG/P or DG.EN detector of all types of gases, unless a specific type/model is described.
Features and functions realised by the MDP:

it powers and controls one measuring detector of the DEX/P or DG/P type or a double threshold
detector of the DEX/A, DEX/F, DG/F or DG.EN type; it controls the status of the wired connection to
the detector (it provides full detection of fault states);

it assigns - three alarm levels to the measuring detector: A1, A2 and A3, adjustable by the user to any
value within the full measuring range;
- two alarm levels A1 and A2 (according to the detector's factory settings) for the threshold
detector;

allows the calculation of the weighted average (TWA) and the short-time exposure limit STEL for the
toxic gas concentration detectors;

allows you to specify the type of measuring units displayed for the detector: [%] of the measuring
range, [%LEL], [ppm] or [%V/V];

allows five modes of operation: "MEMORY MODE". Indicates that an alarm has occurred after the
alarm has disappeared, "WITH UPHOLDING MODE" - maintains active alarm conditions after the
alarm source disappears, "MODE A3" - turns off the power supply of the detector with the catalytic
sensor, which protects against overload, "NO MEMORY MODE" - automatically resets the states of
inputs and outputs on the front panel after the alarm states disappear, "SERVICE MODE" -
deactivates the module outputs for 1 hour;

"SILENT MODE" - independent from the above - mutes the inner siren;

visually signals the signal value and the alarm and fault states of the detector (LED display) as well as
the states of the control outputs A1, A2, A3 and the detector fault (LED display) with the simultaneous
acoustic signaling (built-in siren);

stores in a non-volatile internal memory the 200 most recent events with the assigned start and end
times and the source of the event;

enables very precise setting of alarm delay times and unchangeability of these parameters in time
thanks to microprocessor control;

12V alarm outputs (one for each threshold A1 and A2) control additional acoustic and optical
signaling devices;

the relay outputs (galvanically separated, one for each A1, A2, A3 and fault) control the fans,
motors, contactors, information boards, or connect to the building/facility automation;

the "FAULT" relay output (galvanically separated from the system) informs about the module's
fault state, damage to the connection line to the detector or power failure;

optionally, the MDP-1.A/TM model with isolated RS-485 (MODBUS RTU) port provides remote
control, identification and diagnostics of the module together with the detectors and cooperation
with the control module or with "intelligent building" control systems;

optional isolated analog output I
0
=4-20mA (model MDP-1.A/T/420) or U
0
=2-10V (model MDP-
1.A/T/V10) for inverter control;

the case is suitable for installation on a TS 35mm rail in standard electrical switchboards;

the outputs are compatible with the MD(P)-2(4,8,16)... module outputs;

all electrical terminals are removable (for disconnecting without voltage);

configuration of module settings by means of a keyboard on the front panel.