Chromalox MiniMax 1, User Manual, Page: 14 / 28

- 12 - © 2021 Chromalox
®
, Inc. 1-888-996-9258
Demand Indicator
The LED demand indicator is located on the main PC board and is viewable through the cover. With
the On/Off control option, the indicator will display steady “on” and steady “off”. With the DOT Firing
option, the indicator will display the rapid firing sequence.
Auto/Manual Input
The MiniMax 1, 2, and 3 can be
wired to make it possible to select
an input from either a temperature
process controller or a manual input
potentiometer. A switch is used to
select between the input from a 1K
potentiometer and a linear control
input (see Fig. 4 on page 15). The
unit is shipped with a jumper from
terminals 2 and 3 of terminal block
J2 (see illustration 3). Remove
jumper to install auto/manual input.
IMPORTANT: When enabling the Auto/Manual Input, the jumper from terminals 2
and 3 of terminal block J2 must be removed.
CAUTION
Illustration 3
NC NO
CONTACT
NORMALLY CLOSED
(SWNC)
CONTACT
NORMALLY OPEN
(SWNO)
SWITCH
ASSEMBLY
(SW)
PANEL TO BE
MOUNTED TO
LEGEND
PLATE
(LP)
AUTO HAND
SWITCH KNOB
(SW)
AUTO HAND
WIRING
1
4
NC NO
1K
POTENTIOMETER
J2
CW
MiniMax 1, 2, and 3
On/Off Control Signals
AC Input – The 120 thru 230 Vac signal lines are connected to terminal J1 - 7 & 8 (see Fig. 9 on
page 21). An input voltage of 120 to 230 Vac turns the power On. The turn OFF voltage is 0 Vac.
DC Input – The 5 - 32 Vdc signal lines are connected to terminal J3 - 1 & 4 (see Fig. 10 on page 21).
An input voltage of 5 to 32 Vdc turns the power On. The turn OFF voltage is 0 Vdc.
Contact Closure Input – The dry contact signal lines are connected to terminal J3 - 1 & 2 (see Fig.
11 on page 21). A closed contact turns the power On. The turn OFF voltage is an open contact.
Process Analog Control Signals
MiniMax 1, 2, and 3 have been factory calibrated. These units accept 0 - 5, 1 - 5, 0 - 10 Vdc, and 4 -
20 mA input signals that are connected to Terminal Block J2. The following signals are connected to:
0 - 5 Vdc: Terminal J2 - 9(+) & 7(-) (see Fig. 7)
1 - 5 Vdc: Terminal J2 - 5(+) & 7(-) (see Fig. 5)
0 - 10 Vdc: Terminal J2 - 10(+) & 7(-) (see Fig. 8)
4 - 20 mA: Terminal J2 - 6(+) & 7(-) (see Fig. 6)