Trane BAS-APG001-EN manual Checking binary inputs, Equipment damage

Chapter 5 Installing the Tracer MP581 programmable controller

Figure 36. Wiring binary outputs

Powered output

Signal

<1000 ft

(300 m)

	Common
Pilot relay	Tape back shield
24 Vac coil
	Signal
		< 1000 ft
	Common	(300 m)

NOTE: To reduce the potential for transients, locate output devices in the same room with the Tracer MP581.

Checking binary inputs

To check binary inputs for proper operation:

1.Make sure that the sensor is connected and closed.

2.Set the multi-meter to measure Vac, then measure the voltage across the input connections at the signal and common screw terminals.

The measured voltage should be less than 0.1 Vac. If the voltage is greater than this, the input readings may change erratically.

3.Set the multi-meter to measure Vdc, then measure the voltage across the input at the signal and common screw terminals.

The measured voltage should be less than 0.1 Vdc. If the voltage is greater than this, the input readings may be offset.

CAUTION

Equipment damage!

Continue to step 4 only if you completed steps 2 and 3 successfully.

Measuring resistance may damage the meter if the voltage is too high.

4.Set the multi-meter to measure resistance. If you completed steps 2 and 3 successfully, measure the resistance across the input.

The resistance should be less than 200 Ω when the binary input is closed and greater than 1 kΩ when it is open.

70 BAS-APG001-EN