Maple Chase EC74/50S User Manual

EC74/50S
365-Day Four Channel Time

Control

I. INTRODUCTION

The EC74/50S is a 365-day, four channel, microprocessor­based time control. It is ideal for lighting or HVAC control in
which time-of-day scheduling is common. The programmable
momentary feature provides a 1 to 59 second momentary
contact closure for applications such as bell ringing, urinal
flushing, synchronous wall clock correction and operating
mechanical latching relays. The enclosure is made of durable
noncorrosive plastic for years of life.

II. SPECIFICATIONS

Programming Capabilities

• Seven-day programming using 365-day calendar with
eighth day as a holiday program.

• 16 holiday durations programmable by date.

• 50 set points. A set point can be assigned to any day or to
any combination of days. Each of the 4 circuits can be
independently programmed.

• Each set point can be either an ON, OFF or momentary
type event. A programmable momentary duration of 1-59
seconds can be entered for each of the 4 circuits.

• 12-hour (A.M./P.M.) or 24-hour clock format.

• Automatic daylight-saving time changeover with yearly
compensation.

• Keyboard override until next programmed event.

• 3-second stagger up between loads.

• Leap year corrected.

• Keyboard programming.

• LCD display of time-of-day and day of week. Circuit status
indicated by LEDs (if LED is lit, output relay is energized as
a result of a programmed ON or an override).

Electrical
Power Requirements:

Input Power (three voltage models):

24 Vac (+10-15%), 50/60 Hz
100-120 Vac (+10-15%), 50/60 Hz
200-240 Vac (+10-15%), 50/60 Hz

4 SPDT Output Relay Contacts:

VOLTAGE RESISTIVE H.P. PILOT DUTY

24 Vac 10A 1/10 60 VA
120 Vac 7.5A 1/3 345 VA
240 Vac 5A 1/2 360 VA

Wiring: Terminals can accommodate 12 to 24 AWG wire.

Power Outage Carryover
Program and Time-of-Day Back Up-100 hours of carryover

with 9 volt alkaline battery (not provided).

• This control is completely operational during a power out­age, except for relay operation.

Accuracy
Time-of-day-Maintained time is as accurate as line frequen-

cy.
Resolution-One minute for time-of-day and programmed ON

and OFF events. (One second resolution using momentary
type event.)

Physical
Dimensions: Height 8.5 in. (21.6 cm)

Width 6.3 in. (16 cm)
Depth 3.8 in. (9.6 cm)

Weight: Approximately 1.6 lbs. (.7 kg)
Enclosure: NEMA type 3R plastic case.

Conduit knockouts.

Mounting: Vertical
Environment
Temperature: Operating-32 degrees F (0 degrees C) to

122 degrees F (50 degrees C)
Storage-0 degrees F (-20 degrees C) to 140

degrees F (60 degrees C)

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III. INSTALLATION INSTRUCTIONS

Mount the control in an environment that is free from exces­sive contaminants such as oil, moisture, or dirt.

EC74/50S Mounting

1.Remove control from case by pushing outward the two clips

on the left and right within case, and carefully lift control
out.

2.Mount case in a vertical position using mounting holes pro-

vided (see Figure 1).

3.Replace control into case by sliding control under tabs at

the top of the case. Push down and clips snap into place.

Figure 1.

Dimensions of EC74/50S

Conduit Connections:

1.Remove desired center knockouts by placing screwdrivers

on inner ring groove by the arrow (see figure 2), then care­fully apply a solid rap on the handle of the screwdriver with
hand or hammer.

2.Remove outer ring, if necessary, by placing screwdriver

into groove by the arrow (see figure 2) and punch inward.
Smooth the opening's rim with round file or knife.

3.Attach conduit connector first to the conduit, then attach

the conduit connector to the knockout hole using the con­nector lock nut. To prevent unnecessary stress on enclo­sure walls, conduit should be aligned and supported.

Wiring:

Figure 2. Knockouts

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1.Wire 24, 120 or 240 Vac to input terminals, depending on

the model selected. Terminals can accommodate 12 to 24
AWG wire. CAUTION: Damage will occur to unit if incorrect
voltage is applied. Application of incorrect input voltage will
void warranty.

2.Connect output wiring as required for the particular appli-

cation.

3.Install a 9V alkaline battery (not provided). Remove battery

cover. See Figure 3 below. Snap battery into battery clip.
Replace battery cover.

4.Maintenance-The EC74/50S has been carefully engineered

for reliability and safety; therefore, the only maintenance
required is to replace the 9V battery approximately every
two years. A battery log is provided to write down battery
replacement dates. Do not use any type of cleaning agent
on the liquid crystal display or the front panel.

Figure 3. Battery Cover

IV. CONTROL DESCRIPTION

Figure 4. Front Panel

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Front Panel

1.Time/Date Indicator-Displays hours and minutes in 12/24

hour format (for example, 00:00=midnight, 12:00=noon) or
month and date for current day or an event being pro­grammed or revised.

Day of Week Indicator-Displays current day of week or
day being programmed. (Sunday=1, Monday=2,
Saturday=7)

2.Mode Keys-PRG (program), CLK (clock), HOL (holiday),

RUN used to select mode of operation.

3.Number/Day Keys-Used to select circuit number, and set

or program time, day, date and year.

4.Clear Key-Must be used to clear an old entry before a new

one may be entered and to clear keying errors.

5.AM/PM Key-Used to select 12-hour clock format and AM

or PM in program and clock modes.

6.Event TYP (type) Key-Used to select ON, OFF, or momen-

tary event type.

7.Manual OVR (override) Key-Used to toggle relay state

until next event.

8.DUR (duration) Key-Used to program length of momen-

tary pulses.

9.E (enter) Key-Used to enter a new set point and advances

to allow review of program.

V. PROGRAMMING INSTRUCTIONS

The EC74/50S is easy to program. The sequence outlined
here is the logical order of programming. First, you will want
to program the time-of-day, day of week, date, and year.
Then you can program set points according to your applica­tion (refer to Application Examples, Section VI for sample
programming). You program the start time of the set point
only, and you do not program the stop time. The starting of
the next programmed set point terminates the present set
point.

For your convenience, the control can be programmed with­out line power by using battery carryover. Relays, however,
will not operate without line power.

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NOTES:

1.When the unit is first powered, the display will show “24

Hr.” Press the Enter key to select 24 hour format. Press the
AM/PM key to select 12 hour format. (The display will
change to midnight on Sunday with the period flashing.)

2.The unit's memory can be cleared by disconnecting line

voltage and carryover battery.

3.For relay state to change, time must run through the set

point starting time (for example, programming an 8:00 a.m.
start time when it is already 9:00 a.m. will not change relay
state); use override to change state immediately.

4.A zero must precede the hours, minutes, month and dates

which are less than ten (Example-04/01 is April 1st).

5.The day of week is displayed as follows: 1=Sunday,

2=Monday, 3=Tuesday, 4=Wednesday, 5=Thursday,
6=Friday, 7=Saturday, and 8=Holiday.

6.In all programming modes, if a keying error is made, press

CLR then reprogram entire sequence of number keys.

7. 24-Hour Clock Time 12-Hour Clock Time

0:00 12:00 AM (Midnight)
1:00 1:00 AM
2:00 2:00 AM
3:00 3:00 AM
4:00 4:00 AM
5:00 5:00 AM
6:00 6:00 AM
7:00 7:00 AM
8:00 8:00 AM

9:00 9:00 AM
10:00 10:00 AM
11:00 11:00 AM
12:00 12:00 PM (Noon)
13:00 1:00 PM
14:00 2:00 PM
15:00 3:00 PM
16:00 4:00 PM
17:00 5:00 PM
18:00 6:00 PM
19:00 7:00 PM
20:00 8:00 PM
21:00 9:00 PM
22:00 10:00 PM
23:00 11:00 PM

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