Mettler Toledo IND780 Guide D'installation page 70

Note:
The open collector outputs are TTL compatible and current-sinking, and can handle signals from 5
to 30 VDC at a maximum of 35 mA.
2.7.5.4. Hardware Jumper Settings
The flow meter board has four sets of hardware jumpers, indicated in Figure 2-72.
2.7.5.4.1. J5/J6 – Filter Enable
Each of the two input channels indicated in Figure 2-72 has a set of six jumper settings, which
function as shown in Table 2-17. Jumper locations 1-2 (enable) and 3-4 (disable) control the
15kHz low-pass analog filter, which is used to filter noise on the input.
The analog filter should be enabled in the following cases:
2.7.5.4.2. J5/J6 – Input Switching Threshold
For each channel, this jumper has four possible positions (5/6, 7/8, 9/10, 11/12), which set the
comparison voltage level for the input comparator. Voltage levels are:
2-46
METTLER TOLEDO IND780 Installation Guide
The IND780 Flow Meter Option Board may only be used with flow meter outputs that do
not exceed Class 2 limits according to The National Electric Code.
W2 and W3
J2
Figure 2-72: Flow Meter Interface Board Jumper Locations
Table 2-17: Settings for Jumpers J5 (Channel 2) and J6 (Channel 1)
•
For flow meter frequencies below 15 kHz
•
For all AC applications, regardless of frequency
J5 – Channel 2
J6 – Channel 1
• Function
Analog Low-Pass Filter on
Analog Low-Pass Filter off
24V Range
12V Range
5V Range
AC Range
• Jumper
Location
1 2
3 4
5 6
7 8
9 10
11 12
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