ENMET MX-52 - Manual (Page 33)

MX52 C ONTROL ENMET Corporation
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5.5 Startup of the MX52 C ONTROL
W ARNING : The handling operations and adjustments described in this section must be performed by authorized
personnel only, as they are liable to affect detection safety.
Once the control has been switched on, it can be programmed, the channels can be programmed according to the
sensor/transmitter used, and the control and sensor/transmitter can be calibrated. The programming operations can be
carried out directly on the
MX52 C ONTROL according to the following procedures, or by using a computer equipped
with the “ COM 52 ” software.
5.5.1 Programming the Control
To program the MX52 C ONTROL the “Unit programming” menu must be used (see Section 5.4 on Menus) in
conjunction with the keypad and the “Programming” switch. Then, the instructions in the menu should be followed
carefully.
N OTE : If the control is left in the programming mode for more than 30 minutes, it automatically switches to fault mode.
5.5.2 Programming the Channels
• • • • Programming
To program each channel according to the type of sensor/transmitter used, the “Channel programming” menu must be
used (see Section 5.4 on Menus) in conjunction with the keypad and the “Programming” switch. Then, the menu
instructions should be followed carefully.
When a channel is switched on, all its relays are in “off” mode and its current output is 1 mA. One minute later, the
channel comes into effective operation, with relays ready and output of 4-20 mA.
N OTE : If the control is left in the programming mode for more than 30 minutes, it automatically switches to fault mode.
• • • • Copy
In order to make the programming of ALL CHANNELS less TIME-CONSUMING when the same programming is
required for a number of channels, it is recommended that the “COPY” menu be used (see Section 5.4 on Menus) in
conjunction with the keypad and the “Programming” switch. Then, the instructions in this menu should be followed
carefully.
5.5.3 Calibrations
When it is first switched on, with the C ONTROL and channels programmed, CALIBRATING operations must be
carried out on both the C ONTROL and the Sensor/Transmitters.
Channel connected to a sensor/transmitter supplying a standard 4-20mA current.
Prepare the sensor/transmitter for calibration:
Set the zero and gain of the sensor/transmitter according to the instructions furnished with that device.
N OTE : When the sensor/transmitter and C ONTROL channel are calibrated at the same time. The sensor/transmitter
should be in normal operating mode, but the MX52 C ONTROL should be set to calibration mode in order to
inhibit the relays.
Note that with ENMET sensor/transmitters there are two ways of checking the signal supplied to the control:
By direct reading on the sensor/transmitter display.
By using a milliammeter to measure the current on the terminals provided for that purpose (see the manual for
the sensor/transmitter concerned).
Adjust the sensor/transmitter zero: If the ambient air is not pure, use air from a cylinder. When the signal is stable,
adjust the sensor/transmitter zero current output to 4 mA.
Prepare the MX52 C ONTROL for calibration:
Adjustment of the MX52 C ONTROL potentiometers affect the other settings, so adjust them in the order listed.
1. First adjust MX52 C ONTROL display to zero, adjust the Control channel zero by using on the ZERO potentiometer
for the channel (Item A, Figure 11) read ZERO on the MX52 display.
2. Second adjust the MX52 C ONTROL zero current output, adjust the 4-20mA current output to 4 mA by using the
corresponding 4 mA potentiometer: (Item B, Figure 11).
This current is read by connecting a digital miltimeter directly to the corresponding current output (see Figure 12).