M4557 - Model 9210 Nitriding Controller
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.
SSi Manual SERIES 9210-M4557-Nitriding | Page 25 of 25 |