Omron E5ZD, Руководство по эксплуатации

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7
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When making the setting for the heater burnout detection level, it is recom-
mended that you set 1 A or more as the difference between normal status and
heater-burnout status. If the set value is too small, then detection will be unsta-
ble due to the influence of fluctuations in measurement resulting from changes
in the ambient temperature of the E5ZD. In addition, fluctuations in the heater’s
power supply voltage will cause fluctuations in the current, so you must take
that into account when setting the heater-burnout detection level.
•
The heater-burnout detection function cannot be used when the heater is con-
trolled by either the phase control method or the cycle control method. In addi-
tion, it cannot be used for three-phase heaters.
•
The E54-CT2 Current Transformer cannot be used with the E5ZD. Be sure to
us an E54-CT1 or E54-CT3.
•
The control output circuit has a circuit for protection against short-circuiting or
overcurrent which is effective regardless of whether the circuit is used as a
voltage output or an open collector output. This is only for short-term protec-
tion, however, so be sure to correct the problem quickly.
•
The following OMRON power supplies are recommended:
Input
voltage
Capacity Output
current
Open Construction
Models
Models with
Covers
100 V 25 W 1.1 A S82J-0224 S82J-5224
50 W 2.1 A S82J-0524 S82J-5524
200 V 25 W 1.1 A S82J-2224 S82J-6224
50 W 2.1 A S82J-2524 S82J-6524
•
The E5ZD’s alarm 1, alarm 2, HB alarm, HS alarm, temperature controller error
alarm, and cooling control outputs (for the heating and cooling output models)
are open collector outputs and are not protected from excessive voltages or
currents. Therefore, do not impose a voltage or current exceeding 30 VDC or
50 mA on the E5ZD, otherwise the internal circuitry may be damaged.
•
When using an HB alarm or HS alarm output, adjust so that the ON/OFF-timing
of the control output and those of the actual heater current are synchronized. If
the control output is sequenced before being output, there will be a time lag
between the ON/OFF-timing of the control output and that of the heater cur-
rent, and consequently an HB alarm or HS alarm output will be turned ON.
•
For stable communications, wait for 3 s or more after turning on the E5ZD and
using communications.
•
When control operation is stopped, the channel’s alarms will be turned OFF.
•
The alarm 1, alarm 2, HB alarm, and HS alarm outputs are output for an alarm
for any one or more channels.
Precautions
Section 1-4