Watlow Series D8 - Manual (Page 44)

Chapter 2: Installation Series D8 User’s Guide
26 Watlow Anafaze Doc. 0600-3120-2000
Testing the System
This section explains how to test the controller after installa-
tion and prior to making field wiring connections.
TB50 or TB18 Test
Use this procedure to verify that the TB50 or TB18 is properly
connected and supplied with power:
1. Turn on power to the D8. The display should first show
Calculating checksum
, and then show the single-loop
display. If you do not see these displays, disconnect pow-
er and check wiring and power supply output.
2. Measure the +5 Vdc supply at the TB50 or TB18:
a) Connect the voltmeter’s common lead to TB50 ter-
minal 3 or TB18 terminal 2.
b) Connect the voltmeter’s positive lead to TB50 or
TB18 terminal 1. The voltage should be +4.75 to
+5.25 Vdc.
Digital Output Test
Use this procedure to test the controller outputs before loads
are connected. If using it at another time for troubleshooting,
disconnect loads from outputs before testing.
1. Connect a 500
Ω to 100 k Ω resistor between TB50 or
TB18 terminal 1 and a digital output terminal. See
Table 2.6 on page 36 for TB18 connections or Table 2.7
on page 37 for TB 50 connections.
2. Connect the voltmeter’s positive lead to terminal 1 on the
TB50 or TB18.
3. Connect the voltmeter’s common lead to the digital out-
put terminal.
4. Use the digital output test in the I/O tests menu to turn the
digital output on and off (see Test Digital Output 1 to 20
on page 153). When the output is off, the output voltage
should be less than 1 V. When the output is on, the output
voltage should be between 4.75 and 5.25 V.
NOTE! By default, heat outputs are enabled. Only
disabled outputs may be turned on using the
manual I/O test. To test heat outputs, set the
corresponding loop to manual mode 100 per-
cent output. See Changing the Control Mode
and Output Power on page 85.