Chromalox MaxPac, Руководство пользователя, Страница: 24 / 44

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Remote Stop
When it is necessary to disable or enable the output, connect a dry contact between J3 – 3 & 4.
When it is closed, the power control will disable the output.
IMPORTANT: This stop overrides the control input only. It will NOT protect against
faulted or damaged SCRs.
CAUTION
Shorted SCR Detection (optional)
This features provides a means of alerting an operator to a problem with the system. An external
indicated lamp or relay can be connected to J1 – 5 & 6 (See Fig. 2). This indicator must be rated for
the instrument power applied to J1 -1 & 2. Three diagnostic LEDs show which SCR pair is faulted.
These lights are synchronized with the demand indicator and can only indicate while the demand is
active.
The latching alarm means that if the alarm activates and the system subsequently returns to normal,
the alarm will remain latched until a reset button (external – customer provided) is pressed. A non-
latching alarm resets automatically.
SHORTED SCR DETECTION
DEMAND
1 2 3
Heat Sink Over-Temperature
An external lamp or relay may be connected to J1 – 3 & 4 (see Figure 2) (this must be rated for the instru-
ment power applied to J1 – 1 & 2). This will provide an indication to the operator that the heat sink has ap-
proached an unsafe temperature level of 200˚F (93˚C) The unit will enter a stop mode if the temperature rises
to 212˚F (100˚C).