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M4557 - Model 9210 Nitriding Controller
SSi Manual SERIES 9210-M4557-Nitriding Page 25 of 25
Zone Assignments
WARNING: This screen should not be changed without consulting SSi at 800-666-4330
.
The zone assignment feature allows the SERIES
9210 program to change set points on all
instruments of a multi-zone furnace. The SERIES
9210 has up to five (5) temperature and
atmosphere zone assignments available. The
SERIES 9210 programmer looks for appropriate
zone assignments whenever a set point is to be
sent to the atmosphere or temperature controller.
The temperature set point is sent to every
instrument number in the temperature zone
assignment.
If the
ZONE_OFF
(Zone Offset) opcode had been
used in the program, the set point sent to the
specified zone instrument would have the offset
added. For example, a 3-zone pit furnace where
the bottom zone usually has a higher set point.
The middle zone and the top zone usually have a
lower set point. The bottom zone temperature controller is assigned to zone 1, the middle temperature
controllers to zone 2, and the top zone controller to zone 3.
If the first three steps of a program are as shown below, then the bottom zone set point is 1725, the
middle zones are 1750, and the top zone is 1800.
Step opcode Temperature Atmosphere Option
1
ZONE_OFF
50 1
2
ZONE_OFF
25 3
3
SETPT
1750
The first step sets the offset for zone 1 to –25 degrees; therefore, the bottom zone controller would be
sent a set point of 1725 when step 3 is executed. Likewise step 2 sets the offset for zone 4 to 50 degrees.
The top zone then receives a set point of 1800. The middle zone controller would receive the 1750. The
temperature controller displayed on the Status Display is instrument #2. If instrument #2 were the top
zone controller then the Status Display would show the 1800-degree set point.
When using the multi-zone offset feature, the atmosphere and temperature controller assigned as
instruments 1 and 2 should be in zones that will not be offset.