Watlow Series 920 Microprocessor-Based Ramping Control - Manual (Page 78)

Series 920 Error Codes/Alarms
ER1 Error Codes and Actions
9
10
11
12
13
14
15
16
20
21
22
Internal RAM failure; consult factory.
External RAM failure; consult factory.
Bad battery error; consult factory.
A/D conversion error, or input sensor error.
For the input type selected, verify that the
corresponding sensor input is OK, (TC,
RTD, 0-5VDC or 4-20mA). If sensor is
OK, consult factory.
High reference out of limit. Check calibra-
tion procedure. If not OK, consult factory.
Cold junction offset out of limit. Check
calibration procedure. If not OK, consult
factory.
RTD gain out of limit. Check calibration
procedure. If not OK, consult factory.
RTD zero out of limit. Check calibration
procedure. If not OK, consult factory.
0-5V/4-20mA out of limit. Check
calibration procedure. If not OK, consult
factory.
Interpolation/overrange. Check
specification for sensor input range.
Ambient temperature overrange. Check speci-
fication for ambient temperature range.
0-5VDC/4-20mA offset out of limit.
Frequency/Voltage offset out of limit. Clear in the
SYSTEM menu.
Frequency/Voltage gain out of limit. Clear in the
SYSTEM menu.
Stack overflow error; consult factory.
ER2 Error Codes and Actions
1
2
920 transmit buffer overflow.
920 receiver buffer overflow.
Protocol or syntax violation, retransmit.
Framing/overrun error. Check baud rate, parity,
stop bits.
Parity error. Check baud rate, parity, stop bits.
Talking out of turn. Protocol violation, retransmit.
Invalid reply error. Figure out communications,
retransmit.
The lowest alarm code will take priority in an
ALM condition. If two alarm codes are occurring,
the code with the lowest value will flash. Once the
alarm code is corrected in the SYSTEM menu, all
alarm codes will be cleared. When two alarm
codes occur simultaneously, the alarm with the
highest code will never be displayed.
3
5
6
7
It is possible to read multiple alarms via com-
munications. For example, if “ALM1 HI” and
“ALM2 LO” are occurring, “ALM1 HI” flashes on
the front panel since it has an alarm code of 1. But
if the alarms are queried via communications, the
result will be 9, which is ALM1 HI and ALM2 LO.
20
21
22 Command not found. Check your program.
Parameter not found. Check your program.
Incomplete command line. Syntax error, retrans-
mit.
23
24
25
26
28
Invalid character. Syntax error, retransmit.
Number of characters overflow. Numeric syntax
error, retransmit.
Input out of limit. Transmitted value too large or
small, retransmit.
Read only command. Cannot input a value for
that parameter, retransmit.
Write only error. Attempted to read a parameter
that can only be written to.
1.
2.
3.
4.
5
The most recent error received will be displayed
for an ER1 or ER2 condition. For Example: If an
ER2 20 occurs and is not cleared, then an ER2 20
will be overwritten by ER2 21.
If an ER1, ER2, or ALM condition occur, the
indication will flash on the ACTUAL display. In
either the RUN or HOLD mode, press the ENTER
key. This stops the display from flashing for 5
minutes. The error, or alarm must be cleared in the
SYSTEM menu within five minutes or the condition
will continue to flash.
78 WATLOW Series 920 User’s Manual
Appendix
30
32
33
35
36
37
38
39
40
Request to run invalid. Verify a run condition.
Request to hold invalid. Verify a hold condition.
Command invalid in run mode. Cannot enter
values in run mode, retransmit.
Self test mode not active.
Check to see that DIP switch #8 is ON.
Number of steps stored is > 99.
Enter steps only to 99.
No file found. Check your program, retransmit.
No step found. Check your program, retransmit.
No asterisk input allowed.
Follow proper format for entering asterisks.
Infinite loop error. Check the number of consecu-
tive loops, retransmit.
File change error. An attempt to resume a
changed file has occurred.
Rules for Error Codes and Alarms
The priority for displaying errors is ER1, ER2,
ALM. If an ER1, ER2, and an ALM condition occur
simultaneously, the ER1 code will flash on the
ACTUAL display. When the ER1 code is cleared,
the ER2 code will flash
in the ACTUAL display.
When the ER2 code is cleared, the ALM message
will flash.