Watlow CPC400 - Manual (Page 40)

Chapter 2: Installation CPC400 Series User’s Guide
26 Watlow Anafaze Doc. 0600-2900-2000
Connecting the TB50 to the CPC400
1. Connect the SCSI cable to the controller.
2. Connect the SCSI cable to the TB50.
Testing the System
This section explains how to test the controller after instal-
lation and prior to making field wiring connections.
TB50 or TB18 Test
Use this procedure to verify that the TB50 or TB18 is prop-
erly connected and supplied with power:
1. Turn on power to the CPC400. The display should first
show Calculating checksum, and then show the single-
loop display. If you do not see these displays, discon-
nect power and check wiring and power supply output.
2. Measure the +5V Î dc 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
+5.25V
Î dc.
Digital Output Test
Use this procedure to test the controller outputs before
loads are connected. If using it at another time for trouble-
shooting, 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 2.5 on page 37 for TB18 connections or Table 2.6
on page 38 for TB50 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
output 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
35 on page 132). When the output is on, the output volt-
age should be less than 1 V. When the output is off, 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 percent output. See Changing the
Control Mode and Output Power on page 55.