Tecfluid MC-01 - Manual (Page 3)

Cod:E-MI-2151061 I Rev:1
3
1.3 Relay Connection
The connector for the Relay is marked "RELAY 1A" (situated on the bottom left-hand side). The
common contact of the relay is terminal Nº3. The normally open contact (with the relay disactivated) is
terminal Nº1 and the normally closed contact is terminal Nº2. There are no provisions for protection of the
relay contacts inside the MC-01, neither fuse nor over-voltage protection (such as may be needed with
inductive loads), and these must be provided externally as required.
1.4 Pulse Input Connection
The connection to the input from the pulse generator (flowmeter or volumetric counter) must be
made using shielded cable with two live wires and the external shield. The external shield must be
connected to the chassis of the pulse generator and to terminal Nº1 on the input connector of the MC-01
which is marked "INPUT" "TM44", "COVOL" or "TTL" depending on the type of input pulse.
The input cables must not be installed close to power lines as these will induce interferences in the
input lines causing errors in the readings.
A. COVOL
MC-01 Terminal Nº to COVOL connector terminal Nº
1 Shield 1 Shield
2 Live 2 Live
3 No connection
B. TM-44
MC-01 Terminal Nº to TM44 connector terminal Nº
1 Shield 1 Shield
2 Live 2 Live
3 Live 3 Live
C. TTL
MC-01 Terminal Nº
1 Common
2 Live
3 No connection
1.5 4 - 20 mA Output Connection (optional)
The connections to the 4-20 mA output are made to the connector marked " mA" (situated on the
top right-hand side). Terminal Nº1 is the positive of the output and terminal Nº2 is the negative.
The maximum passive load that can be applied to this output is 350 ohms. The use of higher
resistive loads can cause saturation of the output and then you will not get the full 20 mA output.
1.6 Remote Reset Connection (optional)
The input for the remote Reset is intended for a normally open electrical contact connected between
terminals Nº1 and Nº2 of the connector situated at the left of the connector marked "INPUT".
The connection to the input from the remote Reset must be made using shielded cable with two live
wires and the external shield. The external shield must be connected to the chassis of the remote Reset and
to terminal Nº1 on the input connector of the MC-01 which is marked "INPUT". The two live wires are
connected to the terminals of the remote Reset connector.
The input cables must not be installed close to power lines as these will induce interferences in the
input lines causing errors in the equipment.