Delta NANOTRACE DF-745 Instruction Manual download pdf (Page 37)

Connecting to External Devices DF-745 33

The 4-20 mA analog output correlating to the front panel display reading is provided on the

rear of the analyzer through connector J4. This output is electrically isolated from all other

analyzer outputs, and from chassis (Earth) ground.

The maximum load resistance for each is 1K Ohms and the analyzer provides a compliance

voltage of approximately 28 VDC.

6.4 Relay Ports – J8, J9

Four form C (SPDT) relays (contact closures) are provided to assign to the various alarms.

The contacts are rated at 30 VDC, 1A. They are not designed to switch AC power.

The relay contacts can be programmed through the user interface for up to four moisture

levels, temperature, moisture cell diagnostics, zero calibration in progress, analyzer off line,

freeze of analog outputs during calibration.

The relays are wired for Fail Safe operation such that a Normally Open (No alarm) contact

connects to common when an alarm occurs or when power to the instrument is lost.

The relay wiring can be tested with the Relay test routine found on page 57.

Pin # Moisture Relay Description

J8-8 GND Ground

J8-7 RLY2-NC Relay 2 Normally Closed

J8-6 RLY2-NO Relay 2 Normally Open

J8-5 RLY2-COM Relay 2 Common

J8-4 RLY1-NC Relay 1 Normally Closed

J8-3 RLY1-NO Relay 1 Normally Open

J8-2 RLY1-COM Relay 1 Common

J8-1 KEY Unused

J9-8 GND Ground

J9-7 RLY4-NC Relay 4 Normally Closed

J9-6 RLY4-NO Relay 4 Normally Open

J9-5 RLY4- COM Relay 4 Common

J9-4 RLY3-NC Relay 3 Normally Closed

J9-3 RLY3-NO Relay 3 Normally Open

J9-2 Key Unused

J9-1 RLY3-COM Relay 3 Common

Table 5: Pin-Out of Relay Connectors J8 and J9

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 97 98

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Delta NANOTRACE DF-745 Instruction Manual Page 37