DCS 090 Series Reference Manual page 10

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090 Series Reference Manual
When controlling load currents above 1 amp the mounting tab of the triac MUST be firmly
screwed down to a suitable metal surface that can sink the heat generated by the triac while
passing the full-load current. The higher the load current, the more thermal energy must be
removed to keep the triac within safe operating limits. An approximately 6 x 6 inch square of 18
Ga cold rolled steel is usually adequate for most loads up to 10 Amps.
The load contacts are the two ¼" quick connect tabs marked 'LOAD' and 'HOT'. A third 3/16"
quick connect tab, covered by a plastic cap, is located near the two load terminals. This tab is
electrically hot (under the cap) and must never be electrically connected-to.
The load contact is intended to be connected in series with the load as shown in Figure 1.
Because the triac floats electrically, it can operate in either polarity on either side of the load.
The triac always operates in quadrants I & III regardless of the connection topology.
The standard power ECB is intended for control of primarily resistive loads in the .25 to 15 amp
range. Specific options exist for driving small inductive loads (such as solenoids). Consult the
factory for applications driving inductive and higher power (above 15 amps) loads.
The load contact is NOT fused. IT IS THE RESPONSIBILITY OF THE END USE
EQUIPMENT TO PROVIDE THE OVER CURRENT PROTECTION APPROPRIATE TO
THE APPLICATION.
Power ECBs are connected to the main ECB through an isolated, low voltage (TTL) interface
connected at J1. At a minimum the power ECB requires +5, GND and the *LOADx control
th
signal, so at least a three conductor cable is required. A 4 conductor must be added to drive the
optional relay.
One power ECB can optionally be provisioned with a DPDT relay. In this configuration it is
referred-to as the main power ECB to distinguish it from the auxiliary power ECB which has
only a load contact. Two electrically separate dry contacts are provided at the two position
screw terminal blocks J2 & J3. Both contacts actuate simultaneously but can be separately
configured to operate as either normally open or normally closed using the jumpers JP1 and JP2.
The RELAY signal from the main ECB must be connected to the power ECB for the relay to
operate.
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