AMETEK DLM Series - Manual (Page 61)

DLM-E 3kW & 4kW Series Power Supplies Advanced Operation
M362000-01 Rev E 4-17
4.5 Using the Shutdown Function
The Shutdown function is used to disable or enable the supply's output voltage and current. It
can be used to allow adjustments to be made to either the load or the power supply without
shutting off the entire supply. This function may be activated from the front panel at any time by
using the STANDBY switch. It can also be activated via remote programming, using positive or
negative logic, with a TTL compatible input or higher DC signal.
4.5.1 STANDBY Switch
The STANDBY switch is a two–position rocker switch located on the power supply's front panel.
See the front panel diagram in Section 2. When in the STANDBY position, the shutdown circuit
is activated, and the output voltage and current are programmed to zero. Pushing the switch to
the ENABLE position allows normal power supply operation to resume.
4.5.2 Programming the Shutdown Function
The Shutdown circuit uses a 5–24 VDC input to disable or enable the power supply output.
Connections for the input signals are made on connector J3. Rear panel DIP switch S1-6,
determines whether positive or negative logic for the signal is used. The input lines for the
Shutdown circuit are optically isolated and can therefore be used by input sources with a
voltage differential of up to +/– 150 VDC.
External Wiring
Use 20 to 24 AWG wiring when making connections to the J3 connector. Keep wiring as short
as possible.
TTL Shutdown
To activate the Shutdown function using a DC input:
1. Turn off the power supply.
2. Connect the signal source to J3 pin 14 (Remote Shutdown Input/positive) and J3 pin 2
(Return for Shutdown Input) on the J3 connector on the rear panel. See Figure 4–12.
3. Set internal switch SW1-6 to select the desired circuit logic as defined in the following
table.
Switch S1-6 Setting Signal Level Output Condition
UP/Open = Positive Logic
High
Low
OFF
ON
DOWN/Closed = Negative Logic
High
Low
ON
OFF
The red S/D (Shutdown) LED on the front panel lights up when the Shutdown circuit is
activated.