Grasslin FM/1 digi 20 - User Manual

Dimensions
The FM/1 digi 20 is a compact electronic 24 hour/
7 day time switch module, with heavy duty relay contacts
for switching low or line voltage loads. Applicable for
time of day control of pumps, fans, heaters, HVAC con-
trol circuits, lighting, machinery and many other types of
commercial, industrial, and agricultural equipment.
The FM/1 digi 20 model features large keys with
unique “circular programming” for easy programming, a
large LCD display and capacitor backup to retain pro-
gram memory during power outages.
TECHNICAL DATA:
Channels: 1
Programs: 20
Holiday Program: No
Daylight time changeover: Manual
Manual 3 way override: On-Auto-Off
Shortest switching time: 1 minute
Reserve carryover: 100 hrs.
Input voltage models available:
24VAC/DC; 120VAC; 208/240VAC
Switching output: SPDT relay
Switch ratings:
16A res. @ 277VAC
1000W Tungsten @ 250VAC; 500W @ 125VAC
SPECIFICATIONS:
Input draw: 4VA
Input frequency: 50 or 60Hz
Wiring connections: 1/4” quick connects
Ambient temperature: –20°F to 140°F (–28°C to 60°C)
UL and Canadian UL recognized: File E83486
INSTALLATION & WIRING:
Note: Although the FM models contain some degree of spike and elec-
trical noise protection, as with all electronic devices, these units can be
affected by electrical noise. Therefore, it is recommended that they be
powered from a voltage source that has no switching devices or inductive
loads connected.
1. Check the input and output ratings marked on the unit to make sure
this product is suitable for your supply voltage, load, and application.
2. Disconnect supply power prior to installation to prevent electrical
shock.
3. Install in accordance with all applicable National and Local electrical
code requirements.
MOUNTING OPTIONS:
The standard FM/1 models may be surface mounted inside a panel or
flush mounted with MK-FM mounting kit, available from Grasslin. Indoor
NEMA 1, and outdoor NEMA 3R enclosures are available for stand-alone
mounting. Consult Grasslin catalog or price sheet for various options.
A mounting base (MB-FMPC) is available for printed circuit board
mounting. A clear plastic dust cover (DC-FM) is also available.
Models are also available with screw terminals and DIN rail mounting,
or for flush mounting with housing and clear cover. (Digi 20A & Digi 20E)
FM/1 digi 20
One Channel Electronic Time Switch
Terminal Connections
M
LOAD
POWER
TIMER INTERNAL WIRING
COM NO NC
TIME
SWITCH
FIELD WIRING
1 2 3 4 5

Summary

FM;1 digi 20 Overview and Specifications

Product Description and Features

Introduces the FM/1 digi 20, its applications, programming features, and backup capabilities.

Technical Data and Ratings

Details channels, programs, voltage, switching ratings, input draw, frequency, temperature, and certifications.

Installation and Mounting Options

Covers installation notes, wiring, electrical noise, mounting options, and enclosures.

Operating and Programming the Time Switch

Keypad and LCD Display Elements

Explains the function of each key and the elements shown on the LCD display for user interaction.

Setting Time and Daylight Savings

Guides users on setting the current time, day, and managing daylight saving time adjustments.

Programming Schedules

Details how to set ON/OFF events, day selections, and program 24-hour or 7-day schedules.

Advanced Operations and Troubleshooting

Program Management and Override

Explains how to enter specific programs, manage day selections, review existing programs, and use manual override functions.

Program Modification and Deletion

Provides instructions for modifying existing programs and deleting unwanted programs from the timer.

Troubleshooting Common Issues

Addresses common problems like flashing days, loss of program memory, and output not activating as expected.

Grasslin FM/1 digi 20 Specifications

General

Type	Digital Timer
Max Switching Current	16 A
Voltage	230 V AC
Display	LCD
Programming	Daily/Weekly
Number of Programs	20
Contact Rating	16 A / 250 V AC
Mounting	DIN Rail
Shortest Switching Time	1 minute
Protection Class	IP20
Frequency	50-60 Hz
Timing Accuracy	±1 second per day
Operating Temperature	-10°C to +55°C
Contact Type	SPDT (Single Pole Double Throw)